Show HN Sep 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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Ledge.sh – Runnable Markdown Notes
Show HN A tool that lets you write and execute code directly inside Markdown notes.
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Dental Scope – Interactive 3D dental anatomy
Show HN Explore human teeth and jaw structures through interactive 3D models.
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Real-time Solar System with 526k asteroids and all tracked satellites
Show HN Interactive 3D visualization of our solar system with 526k asteroids and live satellite tracking.
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Using 2D DFT, dithering, etc. to maximize eInk manga image quality
Show HN CLI tool converting manga/comics to optimized eReader formats via image processing.
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A working 3D model of an Enigma machine
Show HN Interactive 3D simulation of the WWII Enigma encryption machine in your browser.
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NSL – WSL for Linux
Show HN Run Linux programs inside Linux using a Windows Subsystem-like layer.
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TurboGPT: train 22KiB transformer in 13s
Show HN A tiny GPT implementation that trains a 22KiB transformer model in just 13 seconds.
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Jevstiller – Distill Jev into a local model, with a disagreement bound
Show HN Distills Jev's reasoning into a local model with a formal disagreement guarantee.
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Raven – The harness of harnesses, built for RSI
Show HN A keyboard-driven tool designed to reduce repetitive strain injury risk.
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Pac-Bench – How well can models one-shot a Pac-Man game?
Show HN Benchmark testing AI models' ability to generate Pac-Man in a single prompt.
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Museum of Numbers
Show HN Explore the history and fun facts behind every number, like 2147483647.
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HN.watch – Videos of all Hacker News posts
Show HN Watch YouTube-style video summaries for every Hacker News post in one place.
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Destroy Any Website with Stickman
Show HN Unleash a stickman to smash and destroy any webpage with physics-based chaos.
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PaperMono, e-ink fridge magnet shopping list with mobile web page
Show HN An e-ink display fridge magnet that syncs your shopping list via mobile web.
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Free alternative to graphics design giants
Show HN A free graphic design tool rivaling major platforms like Canva and Adobe.
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Hntui – A TUI for Hacker News
Show HN Browse Hacker News stories and comments in your terminal with a TUI.
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OpenAPPA – open-source deterministic guardrails that don't break agents
Show HN Open-source guardrails ensuring safe, predictable AI agent behavior without disrupting workflows.
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Lofi Cities – Pixel-art city nights with browser-generated lofi
Show HN Enjoy pixel-art cityscapes paired with lofi music generated live in your browser.
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Spivak's Calculus formalized in Lean 4 – every theorem, every problem
Show HN A Lean 4 project formalizing all theorems and exercises from Spivak's Calculus.
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TinyAIArena watch AI agents battle it out
Show HN A platform where AI agents compete against each other in live arena battles.
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A CC0 museum of retro 3D tricks you can paste into a page
Show HN Copy-paste retro 3D CSS/JS effects from a free, public domain museum.
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Building a Markdown editor for Mac, iOS and web
Show HN A cross-platform Markdown editor that works seamlessly on Mac, iOS, and web.
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Reladraw – A diagram language where you decide where to place things
Show HN A text-based diagram language giving you full control over element placement.
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Ekselio – Loveable for finance workflows (local first)
Show HN A local-first AI tool that streamlines finance workflows with spreadsheet-like ease.
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A Claude Code skill to analyze your chess games
Show HN Claude Code skill that reviews your chess games and provides post-match analysis.
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Jev Plays Pokémon Red
Show HN Watch an AI agent play Pokémon Red autonomously in real time.
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Hacker Atlas - A map of what Hacker News talks about
Show HN Visualize Hacker News topics as an interactive map of clustered themes.
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Make math automatic with Mathy
Show HN Mathy helps you build automatic math fluency through spaced repetition practice.
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Doom or Bloom, map your AI worldview
Show HN Visualize and share your personal outlook on AI's future impact on humanity.
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Whiteboard (YC W26) – An open-source IDE for thoughtful software design
Show HN Open-source IDE that helps developers design software more deliberately.
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Make cursed fonts like Times New Bastard
Show HN A tool to generate glitchy, cursed font variations from classic typefaces.
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Agentic CUDA Kernel Optimizer
Show HN An AI agent that automatically analyzes and optimizes CUDA kernels for GPU performance.
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Avoid smooth spinners, use low-FPS spinners
Show HN A guide advocating low-FPS loading spinners to signal wait time honestly.
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Koi.rest – watch some fish and regain your balance
Show HN A calming web app that lets you watch koi fish to de-stress.
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Most Hated Tools
Show HN Discover which developer tools and software people dislike the most.
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AgentRun: DSL to turn agents into workflows
Show HN A DSL framework that converts AI agents into structured, repeatable workflows.
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Treepeat – Code similarity detection using Tree-sitter
Show HN Detect duplicate and similar code patterns across files using Tree-sitter parsing.
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Air-gapped file encryption as self-decrypting HTML page
Show HN Encrypt files offline into a standalone HTML page that decrypts itself in any browser.
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An open-source manufacturing ERP/MES/QMS
Show HN Self-hosted platform combining ERP, MES, and QMS for manufacturers.
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How long do I need to work at my salary before I can coast, or retire?
Show HN A tool to calculate years until financial independence or coast FIRE.
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I built a post-mortem debugger for native Windows x64/x86 crashes
Show HN A post-mortem debugger that analyzes native Windows x64/x86 crash dumps offline.
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An atlas of system designs with interactive architecture diagrams
Show HN Explore real-world system designs through clickable, interactive architecture diagrams.
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Conway's Game of Life in boot sector
Show HN Runs Conway's Game of Life directly from a 512-byte PC boot sector.
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Npunlock – Run custom C kernels for Intel NPUs
Show HN An open-source tool that lets developers execute custom C kernels on Intel NPUs.
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JevBench, a reproducible benchmark for typed decision models
Show HN A standardized benchmark suite for evaluating typed decision model performance.
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Training a model to identify AI web content from structure alone
Show HN A model that detects AI-generated web content using structure, not text.
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Drop – A rootless Linux sandbox with gVisor support
Show HN Run untrusted apps safely in a rootless Linux sandbox powered by gVisor.
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AI·rete·RAG – a Rete rule engine decides, RAG explains why
Show HN Combines Rete rule engine decisions with RAG-powered natural language explanations.
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InstinctFlash – High-Performance Serving Runtime for Robotics Models
Show HN A fast inference runtime optimized for deploying and serving robotics AI models.
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Vellum, the best diagram editor you'll ever use
Show HN Vellum is a powerful, intuitive diagram editor built for seamless visual design.
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Foremerge – Catch intent conflicts between parallel coding agents
Show HN Detects semantic conflicts when multiple AI coding agents work simultaneously.
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A website that tracks US food prices every day
Show HN Daily tracker monitoring real-time grocery and food prices across the US.
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Gdocs-me-up: a high-fidelity Google Docs exporter
Show HN Export Google Docs to HTML while preserving formatting and layout accurately.
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Mini-AGI – Dynamic continual learning model trained on 8GB VRAM
Show HN An open-source AGI experiment enabling continual learning on consumer GPUs with 8GB VRAM.
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Lossless-memory – a personal AI memory that never summarizes
Show HN Open-source AI memory layer that stores full context without lossy compression.
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jevals – replacing LLM judges with typed Jev decisions
Show HN A framework that replaces LLM-based eval judges with typed, structured Jev decisions.
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Radius – A Meetup.com Alternative
Show HN Radius helps you discover and organize local community events and meetups.
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A competition for small neural networks that play strategy games
Show HN Compete with tiny neural nets trained to master strategy games against others.
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Sigabrt.dev – cronjob monitor with an SSH TUI
Show HN Monitor and manage your cron jobs via a terminal UI accessible over SSH.
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CUA-S1 – A System One Model for Computer Use
Show HN An AI model that controls computers via GUI interactions and automation.
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I wrote a custom assembler for CHIP-8 in C++
Show HN A handcrafted CHIP-8 assembler built in C++ that compiles assembly into bytecode.
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Cactus Needle 3: 8-29MB automation models can match DeepSeek V4 Flash
Show HN Tiny 8-29MB on-device AI models that rival DeepSeek V4 Flash for automation tasks.
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LiveWorld – Every 24/7 YouTube live camera on one globe
Show HN Explore worldwide 24/7 YouTube live streams visualized on an interactive 3D globe.
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Jeff – A read-only CLI for semantic code review using Jev
Show HN CLI tool that performs semantic code reviews on your codebase in read-only mode.
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Scry, programmable internet search w/ congestion pricing
Show HN API-driven web search engine that uses dynamic pricing to manage load.
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Ax-check.com – Can agents use your product?
Show HN Test whether AI agents can navigate and interact with your web product.
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Microsoft Office running with Wine on Linux with no virtualization
Show HN Run Microsoft Office 365 natively on Linux via Wine using a Nix flake config.
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Snapdrop: Instantly share files between devices. No setup, no signup
Show HN Browser-based tool to transfer files across devices instantly, no account needed.
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Share your AI Setup, Learn from others
Show HN A platform to share and discover others' AI tool configurations and workflows.
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Craigslist for agent skills, curated by a human
Show HN A human-curated marketplace for buying and selling AI agent skills.
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Aclif – Agent CLI framework: one grammar, canonical names across SaaS
Show HN A CLI framework unifying AI agent commands with consistent grammar across SaaS tools.
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Navier-Stokes Visualized as 1kB i386 demos
Show HN Interactive fluid simulation demos packed into 1KB of x86 assembly code.
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I built a new version of my fun spatial 3D online meeting app
Show HN A spatial 3D virtual meeting platform for fun, engaging online gatherings.
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An e-ink frame that hears birds and draws them as 1800s illustrations
Show HN Identifies bird songs via microphone and displays AI-generated vintage illustrations on e-ink.
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SeasonMap – when to travel where? visualized with climate data
Show HN Interactive map showing the best travel seasons for destinations worldwide.
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Restarted – a 2026 remake of the classic 2015 startup generator
Show HN Generate quirky startup ideas instantly with this revamped 2026 idea generator.
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Halo 3's Guardian, playable in the browser, as my personal website
Show HN Explore a fully interactive Halo 3 Guardian map built as a personal portfolio site.
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How Stale Is Your AI? Release age and training cutoff for 20 models
Show HN Compares release dates and training cutoffs for 20 popular AI models.
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Swift-Qwen3.8-27B, -58.3% thinking, x1.95 speed, accuracy of xhigh
Show HN A fine-tuned Qwen3 27B model that cuts thinking tokens by 58% while nearly doubling inference speed.
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I made a flight simulator, except you're just a passenger
Show HN Experience a realistic flight sim where you sit back and enjoy the ride as a passenger.
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Capsule – Single-file web apps that save their data into SQLite
Show HN Build self-contained web apps that store all data in a single SQLite file.
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Hacking a $20 4G wireless hotspot into a texting device
Show HN Turn a cheap 4G hotspot into an SMS device by hacking its modem interface.
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Pizza Bot – An inbox for AI agents that work in the background
Show HN A centralized inbox to manage and monitor background-running AI agents.
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Loss. a tiny satire about AI progress
Show HN A satirical mini-site poking fun at the absurdity of AI hype and progress.
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Panel – A research workspace where the agent can build its own panes
Show HN An AI research workspace that lets agents dynamically create and manage their own UI panes.
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Ordewell – turn one goal into an ordered plan of coding-agent tasks
Show HN Breaks a single development goal into a structured, ordered task list for coding agents.
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Check if your IP has appeared in a residential proxy network
Show HN Find out if your IP address has been used in a residential proxy network.
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Redis City – Explore how Redis works in an interactive 3D model
Show HN Visualize Redis internals through an interactive 3D city-style simulation.
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Macros with a Behringer FCB1010 MIDI Pedalboard in macOS
Show HN Map FCB1010 MIDI pedal inputs to custom macOS macros hands-free.
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Pushie – Get notified with a simple webhook
Show HN Send instant push notifications to your devices via simple webhooks.
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Neobrutalism.dev – Just added Base UI support and added new color theme
Show HN A component library with neobrutalist design, now supporting Base UI components.
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Sunk Cost – How long until a local LLM rig pays for itself?
Show HN Calculator that estimates when your local LLM hardware investment breaks even vs. cloud API costs.
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AttaLambda: a language where types and data are made of untyped lambdas
Show HN A programming language that unifies types and data using untyped lambda calculus.
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Nari Qwen3-TTS and Qwen3-ASR – High accuracy, low latency and cost
Show HN Nari Labs offers fast, accurate, low-cost TTS and ASR models for voice AI.
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Fly.exe – An EON systems like virtual fruit fly uploaded to computer
Show HN A simulated fruit fly nervous system modeled after EON Systems' digital organism.
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1080p is 920px tall – 1k real browser viewports
Show HN Reveals actual browser viewport heights after UI chrome reduces screen space.
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What Just Pinged Me?
Show HN Identify unknown notification sounds and alerts on your devices quickly.
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Pelican-bicycle alternatives
Show HN A curated list of alternatives to the Pelican-bicycle product.
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Kinesis – Control your Mac with the Meta Neural Band
Show HN Use Meta's Neural Interface Band gestures to control your Mac wirelessly.
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EterDB, a Postgres fork that makes it easy to recover from incidents
Show HN A PostgreSQL fork designed to simplify database incident recovery and restore.
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See Sounds on Your Webcam
Show HN Visualize real-time sound waves overlaid directly on your webcam feed.
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ResolveHQ – A Helpdesk Built on Cloudflare Workers, D1, R2 and Queues
Show HN Open-source helpdesk app powered entirely by Cloudflare's serverless stack.
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Graphify C# – Compiler-accurate Find Usages for coding agents
Show HN Provides compiler-accurate symbol usage search for C# AI coding agents.
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Godot and Rust based multiplexer (terminal panes and more)
Show HN A terminal multiplexer built with Godot and Rust, supporting split panes.
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Bodily Oddities
Show HN A collection of strange and surprising facts about the human body.
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Hacker News, Without AI
Show HN A filtered Hacker News feed that removes AI-related stories and noise.
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Toast, a beautiful by default in terminal IDE
Show HN A terminal-based IDE that looks great out of the box with zero configuration.
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Hacker News, without AI
Show HN Browse Hacker News with AI-related posts filtered out automatically.
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A browser IDE for m68000, Z80 assembly (and more), with graphics
Show HN Browser-based IDE for writing and debugging m68000/Z80 assembly with visual output.
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Vertumnus – printable posters of farmers' market produce seasonality
Show HN Printable seasonal charts showing when farmers' market produce is at its peak.
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MultiMatte, a Promptable Image Background Removal Model
Show HN Remove image backgrounds using text or click prompts with high accuracy.
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DOOM in the kernel, or fibers in eBPF
Show HN Runs the classic DOOM game inside the Linux kernel using eBPF fibers.
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Filament – Fast data movement engine in Go
Show HN A high-performance Go engine for moving and streaming data between systems.
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Art – draw one stroke, let symmetry complete it
Show HN A browser-based mandala tool that mirrors your strokes into symmetric patterns.
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What if the speed of light was 5 km/h?
Show HN Interactive simulation showing relativistic effects if light traveled at 5 km/h.
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Compute polynomials twice as fast
Show HN A technique to evaluate polynomials at twice the speed using clever math.
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Self-hosted company OS, Claude Code and Codex agents in departments
Show HN Open-source company OS that deploys AI coding agents per department.
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Rdltr – Inbox zero for your reading list
Show HN Save, tag, and read articles later with a clean distraction-free reader app.
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Geiger – See every AI agent on your machine and what it can touch
Show HN Monitor all AI agents running locally and audit their file/system access permissions.
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LLM Attention Visualization
Show HN Interactive tool to visualize how LLM attention heads focus on tokens.
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DriveSync – fast Git-styled Google Drive sync CLI
Show HN A CLI tool that syncs Google Drive files using Git-like commands and workflow.
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Copperhead – Cursor for circuit boards
Show HN AI-powered PCB design tool that lets you build circuit boards conversationally.
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Jigsaw Haiku
Show HN A puzzle game combining jigsaw pieces with haiku poetry creation.
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Stuxnet – A reconstructed source code of the infamous cyber-weapon
Show HN Reconstructed source code of Stuxnet, the notorious ICS-targeting malware.
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Interactive Tree of Life
Show HN Explore the evolutionary relationships of all living species interactively.
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Wg-admin – web UI for an existing WireGuard host
Show HN A web-based admin interface to manage your existing WireGuard VPN server.
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HomeCat – Design your backyard office
Show HN Plan and visualize custom backyard office spaces with an easy design tool.
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GET Together – A social network where you don't need POST to Post
Show HN A quirky social network where all actions, even posting, use HTTP GET requests.
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Think Turing Complete, but you write the circuits in TypeScript (WIP)
Show HN A browser-based logic circuit simulator where you build circuits using TypeScript code.
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Engrim – A universal, local-first SQLite memory engine for AI CLIs
Show HN Persistent SQLite-based memory layer that gives AI CLI tools local context.
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Mador – Make any DOM reactive with a tiny 80-line Proxy state tuple
Show HN Lightweight 80-line library that binds reactive Proxy state to any DOM element.
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VODForge – a free local desktop UI for YouTube video/playlist downloads
Show HN A free desktop app to download YouTube videos and playlists locally with ease.
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Kadō – open-source habit tracker, with non-binary habit score, for iOS
Show HN An iOS habit tracker that scores habits on a spectrum, not just pass/fail.
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Fly By – retro biplane flying game
Show HN A retro-styled browser game where you pilot a classic biplane through the skies.
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Personal Context MCP
Show HN MCP server that gives AI assistants access to your personal context and preferences.
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Open-Source eInk Bike Computer
Show HN A DIY open-source bike computer using an eInk display for outdoor navigation.
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Moadim.io – A scheduler for agents
Show HN Schedule and manage time-based tasks and events for AI agents easily.
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TERMy – A fast terminal assistant that does not use LLMs
Show HN A lightweight terminal assistant offering quick help without relying on LLMs.
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Reactor Atlas
Show HN A comprehensive map and database of nuclear reactors worldwide.
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The cheapest GPU cloud – H100s at $2.04/HR, H200s at $3/HR
Show HN A GPU cloud marketplace offering H100 and H200 rentals at industry-low prices.
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OwnTime – a chess clock for your day's priorities
Show HN A chess clock-style timer that helps you track and balance daily priorities.
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I Have Been Clawed – Index of coding agent incidents
Show HN A curated index cataloging real-world failures and mishaps caused by AI coding agents.
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Aura – a Rust agent that investigates and fixes production incidents
Show HN An open-source Rust AI agent that autonomously diagnoses and resolves production incidents.
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I built a version of Omarchy that runs on Apple Silicon
Show HN A macOS port of Omarchy bringing its Linux desktop experience to Apple Silicon Macs.
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FrontierHarness Eval – 9 harness, same model, cost per pass varies 17x
Show HN Benchmarks LLM eval harnesses revealing 17x cost variance across 9 frameworks.
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Weedout – Safari extension that hides YouTube AI-labeled videos
Show HN Safari extension that automatically hides YouTube videos tagged with AI-generated labels.
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ZSvirt – A lightweight, scalable open source virtualization platform
Show HN Open source virtualization platform for managing VMs with minimal resource overhead.
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HN Match Maker – Matching "Who Wants to Be Hired?" With "Who's Hiring?"
Show HN Connects Hacker News job seekers with employers using HN's monthly hiring threads.
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Running 104GB Qwen3.8-Flash-Next on 48GB Mac with at ~12 tok/s
Show HN SlotStream enables running large 104GB LLMs on 48GB Macs via smart memory streaming.
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Newton's Orchard – Browser-based space/gravity playground
Show HN Simulate orbital mechanics and gravity interactions directly in your browser.
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Laser Graffiti
Show HN Draw colorful graffiti on any surface using a laser pointer and camera.
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Floe – an open-source plugin for sample libraries – CLAP/VST3/AU
Show HN Open-source sampler plugin supporting CLAP, VST3, and AU formats for loading sample libraries.
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SubSmith – Turn your own videos into language-learning material
Show HN Convert personal videos into interactive language lessons with subtitles.
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Markdown Viewer and Editor
Show HN A browser-based tool for viewing and editing Markdown files instantly.
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SlideOps – slides from a repo that flag when they drift from the code
Show HN Auto-generates presentation slides from your repo and alerts when they fall out of sync.
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We built the smallest dual-band aircraft tracker
Show HN A tiny dual-band ADS-B receiver module for tracking aircraft in real time.
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Corporate Mind Games – logic puzzles with a sarcastic corporate theme
Show HN Brain teasers and logic puzzles wrapped in biting workplace humor.
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FnScribe – Open-source, offline dictation for macOS
Show HN Privacy-first macOS dictation tool that transcribes speech locally without internet.
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An HN client that summarises long threads and lets you chat with them
Show HN A Hacker News client that summarizes threads and enables AI chat with them.
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NFC Energy-Harvesting PCB Business Card with an MCU
Show HN A smart PCB business card powered wirelessly via NFC with an onboard MCU.
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I missed the moving blocks, so I built a real Linux disk defragmenter
Show HN A real disk defragmenter for Linux that visually moves file blocks on ext4.
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Typebase – A single-folder back end you write in TypeScript
Show HN Build a full back end by dropping TypeScript files into one folder.
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Galaxium, an experimental WebGPU space explorer
Show HN Explore procedurally generated galaxies in your browser using WebGPU rendering.
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The load-bearing vocabulary of Claude
Show HN Identifies which words in prompts most influence Claude's AI responses.
Sep 2026 TOP 10
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An e-ink frame that hears birds and draws them as 1800s illustrations
Show HN Identifies bird songs via microphone and displays AI-generated vintage illustrations on e-ink.
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Make cursed fonts like Times New Bastard
Show HN A tool to generate glitchy, cursed font variations from classic typefaces.
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The load-bearing vocabulary of Claude
Show HN Identifies which words in prompts most influence Claude's AI responses.
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What if the speed of light was 5 km/h?
Show HN Interactive simulation showing relativistic effects if light traveled at 5 km/h.
-
I made a flight simulator, except you're just a passenger
Show HN Experience a realistic flight sim where you sit back and enjoy the ride as a passenger.
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Whiteboard (YC W26) – An open-source IDE for thoughtful software design
Show HN Open-source IDE that helps developers design software more deliberately.
-
Open-Source eInk Bike Computer
Show HN A DIY open-source bike computer using an eInk display for outdoor navigation.
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Reladraw – A diagram language where you decide where to place things
Show HN A text-based diagram language giving you full control over element placement.
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Capsule – Single-file web apps that save their data into SQLite
Show HN Build self-contained web apps that store all data in a single SQLite file.
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Real-time Solar System with 526k asteroids and all tracked satellites
Show HN Interactive 3D visualization of our solar system with 526k asteroids and live satellite tracking.