Show HN May 2026
"Show HN" is where developers showcase their own products and projects on HackerNews. We pick the top-scoring launches every day.
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Atomic Editor – Obsidian-style live preview for CodeMirror 6
Show HN A CodeMirror 6 extension that brings Obsidian-style live preview editing to markdown
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Breathe CLI – Paced resonance breathing in the macOS terminal
Show HN A command-line tool for guided breathing exercises directly in your terminal
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500 years of Joseon court omens as an observability dashboard
Show HN Interactive dashboard visualizing 500 years of historical Korean court omens and events
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Open Envelope – an open schema for defining AI agent teams
Show HN An open-source schema standard for structuring and defining collaborative AI agent teams and workflows.
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I built an Android OS in the browser
Show HN A browser-based Android emulator that runs a full Android OS experience directly in your web browser.
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Helios – what plug-in solar could generate for any address in Britain
Show HN Calculate potential solar energy generation for any UK address using plug-in solar panels.
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Open-source private home security camera system (end-to-end encryption)
Show HN Privacy-focused home security camera system with end-to-end encryption and open-source code
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Tiny-vLLM – high performance LLM inference engine in C++ and CUDA
Show HN A lightweight, high-performance inference engine for large language models built with C++ and CUDA.
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Zot – Yet another coding agent harness
Show HN A development harness for building and managing AI coding agents with streamlined workflows.
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TV Explorer. Adding advanced UI to free online TV
Show HN Enhanced user interface for discovering and watching free online television channels
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AISlop, a CLI for catching AI generated code smells
Show HN Command-line tool that detects and flags AI-generated code patterns and smells in your codebase
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Context-aware Japanese furigana using Sudachi and ModernBERT
Show HN AI-powered tool that generates contextually accurate furigana for Japanese text using advanced NLP models.
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Continue? Y/N: A 60-second game about AI agent permission fatigue
Show HN A quick browser game exploring the exhaustion of constantly approving AI agent requests
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Ktx – Open-source executable context layer for data agents
Show HN An open-source framework that provides executable context management for AI data agents and workflows.
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Hallucinate – Massively Multiplayer Online Rave
Show HN A virtual rave experience where thousands of players dance together in real-time
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Open-Source AI Racing Harness
Show HN An open-source framework for building AI-powered racing simulations and competitions.
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I made an emergency page for my family
Show HN A personal emergency contact page providing family members with critical information during urgent situations.
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Open-source Workspace (mail,docs,spreadsheet,drive) web/iOS
Show HN Complete open-source productivity suite with email, documents, spreadsheets, and cloud storage for web and iOS
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Posthorn, self-hosted mail gateway
Show HN A self-hosted mail gateway for routing and managing email traffic securely.
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GoPeek – open links in live mini browser windows without new tabs
Show HN Browser extension that opens links in floating mini windows instead of new tabs for seamless browsing.
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skills-for-humanity – 171 structured reasoning skills for Claude Code
Show HN A collection of 171 structured reasoning skills designed to enhance Claude's coding capabilities and problem-solving abilities.
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A website that tracks every stock trade Congress makes
Show HN Real-time tracking platform monitoring all stock transactions made by U.S. Congress members.
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Fungible – A local personal finance app in the terminal
Show HN A terminal-based personal finance application that runs locally for managing your money
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Volt – front end tooling for Phoenix that runs inside the BEAM
Show HN Frontend development tooling for Phoenix that runs natively inside the BEAM virtual machine
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Write your BPF programs in Go, not C
Show HN A Go framework that lets you write eBPF programs using Go syntax instead of C.
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OpenBrief – Local-first video downloader/summarizer
Show HN A privacy-focused tool that downloads videos and generates AI-powered summaries locally on your device.
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Audiomass – a free, open-source multitrack audio editor for the web
Show HN A browser-based audio editor that lets you record, edit, and mix multiple audio tracks without downloading software.
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Geomatic – A command-driven geometry studio enabled with autodiff
Show HN A geometry studio that uses command-line interface and automatic differentiation for computational design.
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Twixt – transform one word into another in four moves
Show HN A word puzzle game where you transform one word into another by changing one letter at a time in exactly four moves.
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Git-based front-end interface for Hugo
Show HN A Git-based frontend interface that provides a user-friendly way to manage Hugo static sites.
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Anyone interested in a tool helps to explore C++ ASTs
Show HN A web-based tool for visualizing and exploring C++ Abstract Syntax Trees interactively
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Pablo – a Chrome extension that copies UI from any website
Show HN Chrome extension that lets you copy and extract UI components from any website for reuse in your projects.
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ShadowCat – file transfer through QR Codes in a Browser
Show HN Browser-based file transfer tool that uses QR codes for secure peer-to-peer sharing.
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Freenet, a peer-to-peer platform for decentralized apps
Show HN A decentralized peer-to-peer platform for building and running censorship-resistant apps
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I Made a Claude Skill for Spec-Driven Development (SDD)
Show HN A Claude skill that enables specification-driven development workflow automation.
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Open-source .docx editor library for building document apps
Show HN JavaScript library for creating rich document editing applications with .docx support
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Let agents run any analysis with Mixpanel data, no UI required
Show HN Enables AI agents to perform analytics queries on Mixpanel data programmatically without using the web interface.
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Rmux – A programmable terminal multiplexer with a Playwright-style SDK
Show HN A terminal multiplexer that can be programmatically controlled using a Playwright-style SDK for automation.
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I reverse engineered Apple's video wallpapers
Show HN A project that reverse engineered Apple's dynamic video wallpapers to understand their format and implementation.
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The Hanging Sculptures of the Xiaoxitian
Show HN An interactive digital experience exploring the ancient hanging sculptures of Xiaoxitian temple.
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I made a tactical map-based WWII submarine simulator (public beta)
Show HN A tactical submarine warfare simulator set in WWII featuring map-based navigation and combat mechanics.
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I made a tool for learning scales, chords, and how to combine them
Show HN Interactive music theory tool for learning scales, chords, and their combinations
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Dari-docs – Optimize your docs using parallel coding agents
Show HN AI-powered documentation optimizer that uses multiple coding agents working in parallel to improve your project docs.
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CPU-only transcription for YouTube, TikTok, X, Instagram videos
Show HN Transcribes videos from major social platforms using only CPU power, no GPU required
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Lance – image/video generation and understanding in one model
Show HN Unified AI model that can both generate and understand images and videos in a single framework.
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Hocuspocus 4 – self-hosted Yjs collaboration backend
Show HN A self-hosted backend service that enables real-time collaborative editing with Yjs
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Forge – Guardrails take an 8B model from 53% to 99% on agentic tasks
Show HN A framework that dramatically improves small language model performance on autonomous agent tasks through intelligent guardrails.
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Yt-x v0.8.0 – Browse, play, and download YouTube from the terminal
Show HN A terminal-based YouTube client that lets you search, stream, and download videos without leaving the command line.
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Gaussian Splat of a Strawberry
Show HN Interactive 3D reconstruction of a strawberry using Gaussian splatting technique for realistic rendering.
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Pg_deltax, Apache-licensed alternative to TimescaleDB
Show HN Open-source PostgreSQL extension providing time-series data capabilities as an alternative to TimescaleDB
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Superlog (YC P26) – Observability that installs itself and fixes bugs
Show HN Self-installing observability platform that automatically detects and fixes bugs in production systems.
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Haystack – Review the PRs that need human attention
Show HN AI-powered code review tool that identifies pull requests requiring human oversight and attention.
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I made a 3D pose maker for artists
Show HN A 3D reference tool that lets artists create and customize human poses for drawing.
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Id-agent – Token efficient UUID alternative for AI agents
Show HN A lightweight identifier system designed to reduce token usage in AI agent workflows.
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Number Gacha, a gacha game distilled to its essence
Show HN A minimalist gacha game that strips away all graphics and story to focus purely on the core gambling mechanics.
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Hsrs – Type-Safe Haskell Bindings Generator for Rust
Show HN Generate type-safe Haskell bindings for Rust code automatically
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Files.md – Open-source alternative to Obsidian
Show HN A lightweight, open-source note-taking app that serves as an alternative to Obsidian
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InsForge – Open-source Heroku for coding agents
Show HN An open-source platform that provides Heroku-like deployment infrastructure specifically designed for AI coding agents.
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We missed Winamp, so we built an audio player for macOS
Show HN A nostalgic audio player for macOS inspired by the classic Winamp interface and experience.
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Auto-identity-remove – Automated data broker opt-out runner for macOS
Show HN Automated tool that helps macOS users opt-out from data brokers to protect privacy
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Semble – Code search for agents that uses 98% fewer tokens than grep
Show HN AI-optimized code search tool that dramatically reduces token usage for agents while searching codebases efficiently.
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Mezz, a curl-able WiFi sandbox for IoT pentesting
Show HN A WiFi testing sandbox that simulates IoT environments for penetration testing via curl commands.
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Browser based sythesizer, drum machine and squencer
Show HN A complete music production suite that runs entirely in your web browser with synth, drums, and sequencing capabilities.
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Rocksky – Music scrobbling and discovery on the AT Protocol
Show HN A music tracking and discovery app built on AT Protocol for logging listening habits and finding new music.
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Epiq – Distributed Git based issue tracker TUI
Show HN A terminal-based issue tracker that stores tickets directly in your Git repository for distributed development workflows.
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Watch a neural net learn to play Snake
Show HN Interactive visualization showing how an AI neural network learns to play the classic Snake game using reinforcement learning.
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Burn, baby, burn (those tokens)
Show HN A tool for efficiently burning or destroying cryptocurrency tokens and digital assets
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Sx – an open-source package manager for AI skills, MCPs, and commands
Show HN Open-source package manager that helps you discover, install, and manage AI skills, MCPs, and commands in one place.
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Vibe Coding a $20k /Year Enterprise Logistics Platform
Show HN Building a $20k annual revenue enterprise logistics platform using vibe-driven development approach
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Find the best local LLM for your hardware, ranked by benchmarks
Show HN A tool that helps you discover the optimal local language model for your specific hardware configuration based on performance benchmarks.
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GlycemicGPT – Open-source AI-powered diabetes management
Show HN AI-powered open-source tool that helps diabetics manage blood sugar levels and track glucose data intelligently.
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GridTravel- A community based travel app for users to share routes
Show HN A community-driven travel app where users discover and share travel routes with fellow adventurers.
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Race to the Bottom
Show HN A competitive game where players race to reach the bottom first in various challenges.
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Running the second public ODoH relay
Show HN A blog post about operating one of the few public ODoH relays for anonymous DNS queries.
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Nibble
Show HN A minimal text editor written in C with syntax highlighting and basic editing features.
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Torrix, self hosted, LLM Observability,(no Postgres, no Redis)
Show HN Self-hosted LLM monitoring platform that runs without database dependencies
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Needle: We Distilled Gemini Tool Calling into a 26M Model
Show HN A compact 26M parameter model that replicates Gemini's tool calling capabilities through distillation.
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Doomscroll the Goverment's UFO Files as One Gigantic Microfilm
Show HN Browse declassified government UFO documents in an endless microfilm-style interface
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Statewright – Visual state machines that make AI agents reliable
Show HN A Rust library for modeling and testing distributed systems with visual state machines to ensure AI agent reliability.
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Agentic interface for mainframes and COBOL
Show HN AI-powered interface that modernizes mainframe and COBOL system interactions through intelligent automation.
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A modern Music Player Daemon based on Rockbox firmware
Show HN A modern music player daemon built on Rockbox firmware for cross-platform audio playback
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OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity
Show HN A browser-based physics simulation recreating Antigravity using pure JavaScript.
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E2a – Open-source email gateway for AI agents
Show HN Open-source email gateway that enables AI agents to send and receive emails seamlessly.
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TikTok but for Scientific Papers
Show HN A platform that presents scientific research papers in TikTok-style short video format for easier consumption.
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adamsreview – better multi-agent PR reviews for Claude Code
Show HN Multi-agent system that enhances Claude Code's pull request reviews with improved analysis
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Agent-harness-kit scaffolding for multi-agent workflows
Show HN A scaffolding toolkit for building and orchestrating complex multi-agent AI workflows
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An index of indie web/blog indexes
Show HN A curated directory that catalogs various independent web and blog indexes across the internet.
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Building a web server in assembly to give my life (a lack of) meaning
Show HN A web server implementation written entirely in assembly language as an exercise in low-level programming mastery.
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I made a Clojure-like language in Go, boots in 7ms
Show HN A fast-booting Lisp interpreter written in Go that mimics Clojure syntax and semantics.
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Free tool to mark points and polygon regions
Show HN A free web tool for annotating images with points and polygon regions for mapping and analysis.
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Rust but Lisp
Show HN A programming language that combines Rust's syntax with Lisp's functional paradigm
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Countries where you can leave your MacBook at a random coffee shop
Show HN A guide to countries with low theft rates where you can safely leave belongings unattended
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Create flashcards with Space CLI
Show HN Command-line tool for creating and managing flashcards with spaced repetition learning
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Mochi.js: bun-native high-fidelity browser automation library
Show HN A high-performance browser automation library built specifically for Bun runtime
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CADara – I made an open-source in-browser CAD
Show HN Open-source browser-based CAD software for 3D modeling and design work directly in your web browser.
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GETadb.com – every GET request creates a DB
Show HN A service that automatically creates a database from every HTTP GET request you make.
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Git for AI Agents
Show HN A version control system specifically designed for AI agents to manage their code and data workflows.
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Kstack – Skill pack for monitoring/troubleshooting K8s in Claude Code
Show HN A Claude skill pack that enables Kubernetes monitoring and troubleshooting directly within Claude's code environment.
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Stage CLI – An easier way of reading your AI generated changes locally
Show HN A command-line tool that helps developers review and understand AI-generated code changes in their local development environment.
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I made a vertical-pedalling bike with a novel drivetrain [video]
Show HN A custom bicycle that lets you pedal by pushing straight down with your feet instead of circular motion.
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Trust – Coding Rust like it's 1989
Show HN A retro-style Rust development environment that mimics classic 1980s coding tools and interfaces.
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Agent-skills-eval – Test whether Agent Skills improve outputs
Show HN A testing framework to evaluate whether AI agent skills actually improve output quality and performance.
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Hallucinopedia
Show HN A comprehensive encyclopedia documenting various hallucinogenic substances and their effects.
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Tilde.run – Agent sandbox with a transactional, versioned filesystem
Show HN A secure sandbox environment for AI agents with transactional file operations and version control built-in.
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I built an open-source email builder, alternative to Beefree/Unlayer
Show HN Open-source drag-and-drop email template builder offering a free alternative to Beefree and Unlayer
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PHP-fts – Full-text search engine in pure PHP, no extensions
Show HN A lightweight full-text search engine built entirely in pure PHP without requiring any external extensions or dependencies.
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Adam – An embeddable cross-platform AI agent library
Show HN Cross-platform library for embedding AI agents into applications with SQLite integration
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New Benchmark from SWE-bench team is 0% solved
Show HN A challenging new programming benchmark where no AI system has achieved any success yet.
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Explore color palettes inspired by 3000 master painter artworks
Show HN Discover color palettes extracted from 3000+ masterpiece paintings for design inspiration
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I indexed 8,643 BSides talks across 227 chapters and 6 continents
Show HN A comprehensive database indexing thousands of cybersecurity talks from BSides conferences worldwide.
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Brainio – Markdown notepad that turns notes into visual mind maps
Show HN A Markdown note-taking app that automatically converts your written notes into interactive visual mind maps.
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A Mutating Webhook to automatically strip PII from K8s logs
Show HN Kubernetes webhook that automatically removes sensitive personal data from logs
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Orch8 – Durable workflow engine in Rust, one binary, Postgres or SQLite
Show HN A single-binary workflow orchestration engine built in Rust with database persistence
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I built a new word game, Wordtrak
Show HN A developer's journey creating Wordtrak, an innovative word puzzle game with unique mechanics.
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I Built a Museum Exhibit
Show HN A developer's journey creating an interactive museum exhibit from concept to installation.
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nfsdiag – A NFS diagnostic application
Show HN Command-line tool for diagnosing and troubleshooting NFS (Network File System) connections and performance issues.
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Software Engineer to Novelist: Writing a Book Like Coding
Show HN A guide for software engineers to apply coding principles to novel writing
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Apple's SHARP running in the browser via ONNX runtime web
Show HN Run Apple's SHARP image upscaling model directly in web browsers using ONNX runtime.
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I built a RISC-V emulator that runs DOOM
Show HN A RISC-V processor emulator capable of running the classic DOOM game
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Ableton Live MCP
Show HN Model Context Protocol server for controlling Ableton Live DAW through AI assistants
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Rust library for Undo/Redo using deltas, snapshots or commands
Show HN A flexible Rust library implementing undo/redo functionality with three different approaches: deltas, snapshots, and commands.
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SimDrive – a browser racing game with your phone as the controller:D
Show HN Turn your phone into a steering wheel to control cars in this browser-based racing game.
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State of the Art of Coding Models, According to Hacker News Commenters
Show HN Tracks the latest coding AI models and their capabilities based on Hacker News discussions.
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Pollen – distributed WASM runtime, no control plane, single binary
Show HN A lightweight distributed WebAssembly runtime that requires no control plane and deploys as a single binary for simplified edge computing.
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DAC – open-source dashboard as code tool for agents and humans
Show HN Open-source tool that lets you build and manage dashboards using code, designed for both AI agents and human developers.
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Mljar Studio – local AI data analyst that saves analysis as notebooks
Show HN Local AI-powered data analysis tool that automatically generates and saves insights as Jupyter notebooks.
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Browser-based light pollution simulator using real photometric data
Show HN Interactive web simulator that visualizes light pollution effects using authentic photometric measurements in your browser.
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Filling PDF forms with AI using client-side tool calling
Show HN AI-powered tool that automatically fills PDF forms using client-side processing
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Large Scale Article Extract of Newspapers 1730s-1960s
Show HN Digital archive providing searchable access to newspaper articles from the 1730s to 1960s for historical research and analysis.
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Stop playing my matchstick puzzles, start building your own in seconds
Show HN A web tool that lets you create custom matchstick math puzzles in seconds
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Piruetas – A self-hosted diary app I built for my girlfriend
Show HN A personal diary application that can be self-hosted, created as a gift project.
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Agent-desktop – Native desktop automation CLI for AI agents
Show HN A command-line tool that enables AI agents to automate native desktop applications and workflows.
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AI CAD Harness
Show HN AI-powered tool that enhances CAD workflows with intelligent automation and design assistance.
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Coding-Flashcards – Learn Rust, SQLite, or Godot from First Principles
Show HN Interactive flashcard system for learning programming languages and tools systematically
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GhostBox – Borrow a disposable little machine from the Global Free Tier
Show HN Platform providing free temporary virtual machines for developers and users worldwide
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Loopsy, a way for terminals and AI agents on different machines to talk
Show HN A communication tool that enables terminals and AI agents across different machines to interact seamlessly.
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My Private GitHub on Postgres
Show HN A self-hosted Git repository manager built on PostgreSQL database infrastructure.
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WhatCable, a tiny menu bar app for inspecting USB-C cables
Show HN A lightweight macOS menu bar utility that analyzes and displays detailed specifications of connected USB-C cables.
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Site Mogging
Show HN A website analysis tool that helps you compare and improve your site's performance against competitors.
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Winpodx – run Windows apps on Linux as native windows
Show HN A tool that lets you run Windows applications on Linux seamlessly as native windows.
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What happens when you load a webpage (Interactive)
Show HN Interactive visualization showing the step-by-step process of loading a webpage
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Pu.sh – a full coding-agent harness in 400 lines of shell
Show HN A lightweight shell-based framework for building AI coding agents in just 400 lines.
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OSS Agent I built topped the TerminalBench on Gemini-3-flash-preview
Show HN Open-source AI agent that achieved top performance on terminal command benchmarks
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TRiP – a complete transformer engine in C built from scratch just by me
Show HN A transformer neural network engine implemented entirely in C from scratch by a single developer.
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A new benchmark for testing LLMs for deterministic outputs
Show HN A comprehensive benchmark designed to evaluate how consistently LLMs produce structured, deterministic outputs across various tasks and formats.
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Rocky – Rust SQL engine with branches, replay, column lineage
Show HN A Rust-based SQL engine that supports Git-like branching, query replay, and data lineage tracking.
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Drive any macOS app in the background without stealing the cursor
Show HN Control macOS applications programmatically without interrupting your current work
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Rip.so – a graveyard for dead internet things
Show HN A digital cemetery documenting and memorializing defunct websites, apps, and online services that have shut down.
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Live Sun and Moon Dashboard with NASA Footage
Show HN Real-time space dashboard displaying live solar and lunar imagery from NASA data feeds
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Auto-Architecture: Karpathy's Loop, pointed at a CPU
Show HN Automated CPU architecture optimization using Karpathy's iterative improvement loop methodology.
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Adblock-rust Manager – Firefox extension to enable the Brave ad blocker
Show HN Firefox extension that integrates Brave's powerful Rust-based ad blocking engine into Firefox browser for enhanced ad blocking capabilities.
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My retired dad and I made a daily, somewhat difficult, quiz
Show HN A daily challenging quiz created by a father-son duo featuring varied topics and difficulty levels.
May 2026 TOP 10
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Needle: We Distilled Gemini Tool Calling into a 26M Model
Show HN A compact 26M parameter model that replicates Gemini's tool calling capabilities through distillation.
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Files.md – Open-source alternative to Obsidian
Show HN A lightweight, open-source note-taking app that serves as an alternative to Obsidian
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Forge – Guardrails take an 8B model from 53% to 99% on agentic tasks
Show HN A framework that dramatically improves small language model performance on autonomous agent tasks through intelligent guardrails.
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WhatCable, a tiny menu bar app for inspecting USB-C cables
Show HN A lightweight macOS menu bar utility that analyzes and displays detailed specifications of connected USB-C cables.
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Audiomass – a free, open-source multitrack audio editor for the web
Show HN A browser-based audio editor that lets you record, edit, and mix multiple audio tracks without downloading software.
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Gaussian Splat of a Strawberry
Show HN Interactive 3D reconstruction of a strawberry using Gaussian splatting technique for realistic rendering.
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Semble – Code search for agents that uses 98% fewer tokens than grep
Show HN AI-optimized code search tool that dramatically reduces token usage for agents while searching codebases efficiently.
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Hallucinate – Massively Multiplayer Online Rave
Show HN A virtual rave experience where thousands of players dance together in real-time
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I reverse engineered Apple's video wallpapers
Show HN A project that reverse engineered Apple's dynamic video wallpapers to understand their format and implementation.
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Building a web server in assembly to give my life (a lack of) meaning
Show HN A web server implementation written entirely in assembly language as an exercise in low-level programming mastery.