SimCity, but with Permits

Sumi.css – CSS Framework

A minimalist, classless-first CSS framework.

VoidAccess – open-source dark web OSINT, from query to a graph

Hi HN! Im Katriel, and im a Security Researcher/Enthusiast and in the wave of AI, i wanted to build that next gen of security tooling that surpasses the current tools, and even the paid industries with an open source engine. I built MailAccess as well, which is going to be the…

Penmentor – Claude marks up your handwritten math like a teacher

AI mentor that corrects your written math visually with local harnesses.

Jev Cards, Can you beat a vision model at a picture quiz?

I built a quiz game around TypeSafe's new Jev model, which has vision capabilities. Jev looks at a picture and a question and picks an answer (or taps a place) in about a quarter of a second. I've always loved quiz games and thought this would be a fun way to see what it can do…

Linkit – AI bookmark manager, 100% free and open source

A smart bookmark & knowledge curation desktop app with AI summarization, semantic search, and cross-device sync. Built with Go + Wails + React.

Death Plan Switch, a self-hosted dead man's switch for solo devs

Hi HN, I'm Peter Bishop and I've been working in graphics and web tech for over 25yrs. I've recently launched Death Plan Switch to solve a major problem in my succession plan. What if I go missing or die? The right people are told and my business can continue to operate for my…

Qwen3-4B with the AI writing tics trained out

WhatsApp MCP running free on Cloudflare

I wanted my humble Claude on mobile to access my WhatsApp messages but the only options I could find either required WhatsApp Business or an actual server to run Baileys on. I wanted to run it for free on ClaudeFlare and with my personal WhatsApp account, so I built this.…

Esp32sim – Run ESP32 firmware in the browser

Hi HN, I’ve been working on esp32sim, an open-source ESP32 emulator that runs in the browser. The fun part of the demo is that there is no ESP32 involved — the firmware is executing in the emulator. The goal is to make ESP32 software easier to experiment with, test and simulate…

Sphinx – A hook that quizzes you on your AI's code before shipping

FOSS, Basically it plugs into your existing coding agent workflow and every time you push to prod it'll throw up a questionnaire that checks if you understand how the code you're pushing works.

Llmspeed – feel how fast a local LLM runs before you buy the hardware

The Zelda timeline to catch up before the Ocarina of Time remake

I made this ahead of the Ocarina of Time remake which comes out in 17 days. I remember the feeling of playing it as a kid but I hadn’t kept up with the story so I built a timeline to catch up before the Door of Time reopens. Nintendo’s own timeline is the authority here (Hyrule…

KiviDB, a faster Redis-compatible memory database and vector cache

Hi all, So I have been working on this project KiviDB from February 2026. It started as a project for me to understand rust, having a product with no GC pauses, memory blow up after snapshots and getting OOM on running pods, and that was actually an issue I faced with Dragonfly.…

Clerkenwell – A Handwritten Clojure Notebook

High-quality duck audio synthesizer

Unfenced – Land for sale that borders public land

Guitoro, a virtual guitar you strum with your keyboard

Guitoro is a free browser guitar using recordings of real instruments. You can strum with your keyboard, mouse, or touchscreen, choose acoustic, classical, electric guitar or bass, and see chord fingering and each stroke. Song practice can be slowed to 20%, and there are free…

I built a task system to handle the drudgery so I could focus on tasks

I'm a software engineer from the east coast (who has lived in Boston, NY, the bay area, UK, France), and I built a task system called 3 & Done. It's the place you trust to store everything you need to do. It accepts voice input for rapid entry, as well as text (it stores the…

Gemini 4 Argon plays StarCraft

I've refreshed StarSkirmish Bench, a benchmark where LLMs play StarCraft BW by writing code, with results from the flagship models of OpenAI, Anthropic, Google, and Muse

PS2 games statically recompiled to WebAssembly

PS2 games in the browser: static recompilation to WebAssembly with a native runtime

RoadRash ported to Three.js to run in the browser

Road Rash was one of my favourite PC games growing up. I wanted to play it again, but the browser emulators I tried felt sluggish, so I decided to build a browser version using Three.js. This started mostly out of nostalgia. I wanted to be able to open a link and get back to…

Flipflop – Iroh-powered persistent tunnels for filesharing

This is a project that spun from my frustrations of using LocalSend and DashBeam to transfer stuff between devices, and with the extra goal of being fast, trying out the Slint framework and, most importantly, establishing a communication channel with trusted external people that…

Let your AI agents paint big arrows, boxes and text on your screen

Let your AI agents paint big arrows, boxes and text on your Mac screen. One CLI, click-through, gone by itself. Skill for Claude Code and Codex. MIT.

Snitch – my Mac talked to 347 servers in one idle hour, so I built this

Real-time network traffic visualizer — see every connection your computer makes. Privacy-first, 100% local. / Visualiseur de trafic réseau en temps réel, 100% local.

Petal, open-source CoScreen/ScreenHero finally free

Hi HN! I’m Jason Thomas, one of the founders of CoScreen. As some of you may know, Datadog sunset the CoScreen service on July 31st. Four of us from the original CoScreen team have spent the last couple months building a free and open source pair programming tool inspired by…

Open-source early-reading reader with phonics help

My kid is 6 y/o and she is learning to read. She's moved through the basic phonics with Teach Your Monster to Read but was struggling with how repetitive it was. I wanted to give her some stories to read, but she still needed help sounding words out - and I wanted her to have…

Lights-on software factory boilerplate for Claude Code

A starting point for running a lights-on software factory with Claude Code. Based on the setup developed for Votito, where the orchestrator reduced token cost compared to bare-bones Claude workflow execution by around 80%.

500 clocks in one 6.3 MB HTML file by Opus 5.5

Lately I've been testing frontier models by having them create self-contained web pages that display clocks--sort of my personal version of Simon Willison’s pelican-on-a-bicycle metric. I have been particularly impressed by the variety, interest, and quality of the clocks…

Carrier-Explode: iPhone, Pixel and Galaxy carrier settings decoded

Showing off carrier-explode, one of my side projects that continuously archives carrier settings for all major phone brands. carrier-explode also contains decoders and explanations for all the common baseband configurations, etc. There’s still quite a bit of work to be done in…

Parin – A 2D game engine between raylib and Godot, written in Dlang

A delightfully simple 2D game engine.

Another Blog Search Engine

Traditional search was not on the original roadmap for our blogosphere/indieweb discovery project. But with the framework and data in place, it was easy enough to add a no-frills search function. In addition to the normal search result info, each post has a link to the Outer Web…

How random are you?

Make AI coding agents verify its own work

AI agents can generate code, but still struggle to understand what they build. Reticle brings Jev-style machine-native runtime perception to web & desktop applications.

Rouler – Steer Windows traffic per app or IP across multiple interfaces

Hi HN, Rouler is "rules for your routes". It allows you to steer network traffic across multiple network interfaces on Windows. For example: - Run Tailscale, Mullvad and OpenVPN official clients simultaneously. - Use Rouler to send Slack via the OpenVPN connection, Chrome + an…

PatchWave - Add static analysis and automerge to Dependabot

Hey Hacker News, we're Ben, Josh, and Donnie, co-founders of PatchWave. PatchWave is a GitHub App that combines static analysis and eval'ed agents to analyze and (optionally) auto-merge PRs it deems as safe. If a Dependabot PR breaks your CI build, a fix agent works to get CI…

Use your OpenAI subscription to create audiobooks

SolidCraft – Open-Source Parametric CAD in Rust (With MCP Support)

SolidCraft: an open-source parametric 3D CAD application built in pure Rust. Desktop, web, and automation through MCP.

Proa – A Rust web framework with fast SSR and multi-target rendering

Video: https://youtu.be/-CfCyvIKYyo?si=hCLuStkXxanCUJD1 Video on multi-target rendering: https://youtu.be/pJx84jdBDKU?si=HRRd6dgUWXiqeWhq Benchmarks: https://github.com/Proa-Labs/proa-benchmarks

Dovepass – can I legally fly a drone along this exact path in SF?

Dovepass answers one question for drone operators: given two points, can a drone legally fly between the two points? I build route planning for delivery drivers and wanted to check what it would look like if the vehicle flies. Drone navigation is different from land-based…

Ranet3 – High performance policy routed IPsec mesh SD-WAN

btw this is already running on all my machines (including a macbook), and i've configured all of them to have routable public ip addresses ;) especially for the mac, my ISP is SFR (over coaxial connection) with only dynamic ipv4, i can use this to get stable v4/v6 addresses very…

Strot – Compile an LLM's intent once, run decisions locally

STROT (arXiv:2505.01636): compile-time LLM code synthesis with deterministic, self-routing NLU runtimes. PyPI: strot-ai

FlexChords – chords for any YouTube song, from a model I trained

I play guitar, and chord charts online were often wrong or oversimplified for the songs I wanted to learn, so I built FlexChords. You can edit the detected chords, transpose, and export to MIDI. 1-minute demo: https://youtu.be/-cbL3L3UnGs It's still a work in progress. I'd love…

BetterWispr – Free, open-source dictation for Mac

I wrote an email app that accepts only one sender per inbox

Infinite inboxes, including prefixes where you don't have to create inboxes before you use them -- they self create when you add a suffix. Three types of inboxes: - One sender. Locks to the first domain to send email (except gmail, outlook, etc where it locks to an email account…

Spotatui, a Spotify TUI/GUI without web API rate limits

About 11 months ago i revived the amazing but unfortunately unmaintained spotify-tui. Since then I have been working on it almost non stop, finding a lot of problems on the way. One of the main issues I ran into were the Spotify web API rate limits. Third party clients like…

Atticus – Hold-to-talk voice assistant for macOS that runs on Claude -p

Hi HN! I'm Saarth. I'm in 9th grade, and I built Atticus. Atticus is a fast and cheap Mac assistant that can do tasks for you. You hold down Control-Option-Space, speak or type your task, be it complex or a simple browser search, and Atticus will get on it. The interesting part…

RawLink – Building a VPN protocol from scratch

https://zola.ink/blog/posts/rawlink-building-a-vpn-protocol-...

WallHop – 12ft.io is gone, so I built a replacement

Hi HN, I'm Josh. WallHop is a free paywall bypass: paste an article URL (or prefix any URL with wallhop.io/) and you get the readable article without the paywall popup, ads or clutter. No signup, no extension. I built it after 12ft.io went away. The News Media Alliance took it…

Civ 1 period accurate decompilation

I've used LLMs to decompile Civ 1 and put the reconstructed C source on GitHub, along with a technical book and story. The reconstructed source builds with what i'm pretty sure is the original Microsoft C compiler and toolchain. It produces a byte-for-byte match with the…

Wonderhop – A daily game: guess what most people say, or what none do

Hello HN! Wonderhop is a small browser game with no account needed to play, everyday there are 4 rounds of 7 quesitons like "Name a food that a lot of people hate" The goal depends on the mode: Either gives the answer most people would give, the one no one would give, the oldest…

I built a tool to track what AI leaders say and how their views change

Quake ported to safe Rust, playable in browser

Things to Do API

I built an api/mcp for local events: pop-ups, one-off events, concerts, etc. currently covering the SF bay area. I've been building a bunch of consumer apps lately around personalization and recommendation and have had a hard time finding this data in one spot. agents can find…

Shazam but for AI Slop Music

I hacked this app together to detect AI Music. It uses Shazam under the hood to identifiy the song and uses a custom trained AI model to detect if its GenAI. I don't have a big agenda. Just want to spread the awareness of AI Music that appears everywhere.

Pug – open-source product analytics

OmniPTY – Opinionated terminal emulator for macOS and Linux

Opinionated terminal emulator for macOS and Linux: splits, workspaces, file tree and prompt built in. GPU-rendered, written in Rust

The rarest tech books and docs you've probably never read

Indigene – Native plants for where you stand

Back when I lived in Central Florida, it took me years to learn what native plants could benefit wildlife and the local ecosystem as I slowly replaced parts of my yard to make it more resilient to drought. After moving to Seattle a few years ago, I had to start all of that from…

Fakeipedia – Wikipedia for worlds that don't exist

Hi HN! Fakeipedia is an automatic world-building platform which takes an imagined world and makes a whole wiki that you can endlessly explore by clicking red links. I came up with this idea a few months ago after playing around with worldbuilding in Gemini, but I didn't want to…

Pulse Local, a Mac budgeting app whose AI models run on your machine

Hi HN, I'm Niz. Pulse Local is a budgeting app for Mac (Apple Silicon, beta) that answers questions about your spending with models that run on your machine. Local mode needs no account. The ledger and your questions stay on the machine, and the app sends no analytics or crash…

XY Music Notation

I've been playing around with a new kind of isomorphic music keyboard that uses a base-12 notation, and wanted some sheet music to learn some new music for it. The idea is to represent each note in 12-TET as a number, so N ∈ (0,1,2,3,4,5,6,7,8,9,X,Y). I used codex to build a…

rStation – A shared research lab for your AI agents

Making a flexible "neon" t-shirt with LED filaments

CallSitter – bot that answers my calls and wastes scammers' time

Anyone else get a lot of dumb scam calls? These days I mostly get them on my mobile. I used to just ignore them, but then I got fed up and built a bot that answers my calls and wastes their time. It runs on OpenAI Live 1. Jev classifies each call as spam, scam or genuine and…

Graphicle, a Rust port of Graphify with memory for coding agents

Code graph and memory for your coding agents, in one Rust program. For Claude Code, Codex, Cursor and any MCP client.

An experimental pattern-first DAW that supports MCP

An experimental pattern-first DAW

A guided 3D Leonardo da Vinci museum, built in code

Hello HN, I am the founder of a small nonprofit which built Museum of Ages. We opened its first wing last week, a digital Leonardo da Vinci museum. It is a virtual tour with 17 stops, his works and then his last house in Amboise. The entrance is free. At the different stops you…

Ito – Build Terminal UIs in Lua

My friend and I are huge Neovim nerds. We like to rice our terminals and our editors. We just wanted a harness that we can do the same with, rice it till our hearts' desire. So, we started looking out for harnesses. Pi was great, Pi was good. But in the end, it was JavaScript. I…

Apogee: Rebuilding Mozilla's Orbit, fully local and private

Hey everyone! Last year, Mozilla released Orbit, an AI-powered browser summarizer hosted on a GCP server. After people started digging into the extension, they discovered things like backend endpoints such as store_result. Eventually, Mozilla discontinued the project. For the…

Proton Drive for Linux

Hello everyone, I wanted to share this small project that I have. It's born out of a necessity that I had, because Proton doesn't ship a Linux version of the drive yet (it's apparently coming out later this year but who knows?) and all the current solutions are hacky and wonky…

OneDeploy – Managed open-source apps with nightly backups and TLS

Parsimony – an open-source benchmark for how much code AI models add

Existing benchmarks measure solve rate and token output/cost, but don't punish excess code, which makes a codebase harder to work with in the long term. I wanted to measure this since it matters most for long-term projects. Method: it takes the patches that benchmarks already…

K10s – A Clickable Kubernetes TUI (Go, Bubble Tea)

Kubernetes TUI you can click. Instant search, logs/exec/port-forward, 7 themes, context-aware AI. Single Go binary.

I got tired of btop not seeing my Mac's chip, so I built siltop

btop is beautiful. But on my M-series Mac it can't tell me the one thing I actually want to know: what is the chip doing? No watts, no GPU, no per-core clocks. So I built siltop: btop's calm, with eyes on the silicon. Real power, clocks and temps straight from the SMC and…

Brickbrag – A multiplayer brick-building world in the browser

Sygal – Convert PDFs, scans and web pages to Markdown, locally

Stoke Money – Personal finance app built around a cash flow forecast

Hi HN, I've been through many finance tracking apps, starting with Personal Capital, then Monarch, and most recently Copilot. None of them have worked perfectly for my needs. All of these apps tend to model “cash flow” as the net sum of your transactions during a month, yet…

Happy Hangul Day! An RNN for Generating Korean Handwriting Strokes

Vibe coded a city builder set in ancient Rome