Computer use on the phone itself: a 2B model that operates Android apps

Sumi.css – CSS Framework

A minimalist, classless-first CSS framework.

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.

SimCity, but with Permits

Clerkenwell – A Handwritten Clojure Notebook

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…

Penmentor – Claude marks up your handwritten math like a teacher

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

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…

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…

Pug – open-source product analytics

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…

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.

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.

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.

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…

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…

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…

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…

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%.

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…

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…

RawLink – Building a VPN protocol from scratch

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

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…

ULDA – Client-side encryption with a simple JavaScript API

Hi there! We have designed client side encrypted storage that sync on multiple devices and allows to hold that data on your server. We have started as chat application in late 2022 that has completly open-readable database. The idea was simple - server holds zero secrets, like…

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.…

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…

Qwen3-4B with the AI writing tics trained out

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

Vibe coded a city builder set in ancient Rome

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.…

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

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…

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…

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…

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.

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…

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…

High-quality duck audio synthesizer

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…

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

Online Piano – Play a Free Virtual Piano Keyboard

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…

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…

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…

Camera Controls and Motion for AI Video Prompts

Tinywm – a scrolling window manager for macOS, inspired by Niri

A scrolling window manager for macOS, inspired by niri

2026 Midterms Tracker blends polls and Kalshi/Poymarket odds

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

Grimoire for Biology

rStation – A shared research lab for your AI agents

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

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

A delightfully simple 2D game engine.

Just gave Claude Code the website and ad budget to see what it would do

I build websites for a living. Lately, it's more about prompting than actually writing the code (the art part is still there). So I decided to leave that part to Claude too and see what it would come up with. So far, I have given it - A baseline website - Full access to Google,…

BlastLoop, a structure-first coding method for AI agents

Structure-first operating process for AI coding agents: Blast / Mid / Inner build altitudes with clear ownership, then T1 structural, T2 bug/ops, T3 adversarial quality gates.

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

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

MirrorMD – An AI second opinion from a facial cosmetic surgeon

Hi HN, I am a facial cosmetic surgeon and have been practicing for just over 20 years. I work in Beverly Hills and Miami and my practice is both surgical and non-surgical (ie fillers) and I specialize in very natural results. I always tell patients: the procedures are easy to do…

deCDN – a peer-to-peer CDN where every piece is BLAKE3-verified

Decentralized CDN where nodes cache and serve content-addressed blobs over iroh QUIC, and clients pay per-MB via off-chain USDC shared payment pools.

Unfenced – Land for sale that borders public land

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…

My Terminal Themes Web App

Well, after 15 years of saying "Someday I'll turn this into a web app," I finally did it! I've been maintaining a popular repo of terminal themes at https://github.com/mbadolato/iTerm2-Color-Schemes, and it was finally time to build the app with all the features I wanted! So,…

Ask a technical question, get an animated explainer you can interrupt

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…

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…

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…

AxiomCode Graph, Reducing coding agent rework with formal methods

Turn any codebase into a knowledge graph grounded in formal methods. Your AI agents get exact answers for any code-related task, ensure correctness, and optimize time and token usage.

The first short movie built using code and AI

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.

T0: We trained a 256M SOTA open-weights time-series forecasting model

Hi everyone, we are excited to share t0-gamma, the latest model in our t0 family. It is a 256M parameter open-weights foundation model for time series (TSFM). It runs on CPU, GPU or Apple chips. https://huggingface.co/theforecastingcompany/t0-gamma t0 leverages historical data…

Every open government tender in the world (Over 250k)

Building an LLM from Scratch in TypeScript

I wanted to understand transformers at a level where nothing is magic, so I'm building a ChatGPT-style model from first principles in TypeScript. Why not Python? I've found that reimplementing concepts in a different language forces me to grasp the nuance of the implementation.…

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…

Built a Rome City Builder

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

Mosh-rs, Mosh rewritten in Rust with scrollback and Windows support

mosh, the mobile shell, rewritten in Rust. Works with existing mosh-server 1.4 and adds a native Windows client and scrollback.

Jevcrawl – A web crawler for AI agents with no LLM in the crawl loop

MCP server and CLI that crawls websites for AI agents: finds the answer page 2x more often than Crawl4AI, 10x cheaper per answer than letting Claude crawl.

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…

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…

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…

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…

Deslop – Oxlint rules for AI-generated TypeScript

Catches unsafe types, duplicate code, and low-value tests.

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…

How random are you?

Sayso, free open source dictation for Mac, Windows, and Linux

Dictation that runs on your own computer. Press a key, speak, and the text lands in the app you are using. Free and open source, for macOS, Windows, and Linux.

Knitting – A shared-memory concurrency runtime for Node.js,Bun,and Deno

Agor, multiplayer AI – stop running agents alone

Multiplayer AI: Bring your team and agents together

Stream live open data in two commands

A service and open source tool to get open data streams in two commands. No sign up needed for subscribing. Streams to try: - https://hypermass.io/stream/_J0fm450s - extreme UV images of the sun from SOHO - visual data - https://hypermass.io/stream/_ATtCoEK - GDACS live disaster…

MemorySync – Memory for AI Agents

I created MemorySync because I kept running into the problem of AI agents not being able to remember useful things about users between conversations. I wanted an easy way to give the agents memory in my application without having to build the whole thing myself. MemorySync is an…

Opensidian

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…

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.

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…

An experimental pattern-first DAW that supports MCP

An experimental pattern-first DAW

Brickbrag – A multiplayer brick-building world in the browser

Opus 5.5 made a fully featured Figma clone in 3 hours / 8 prompts

I think a chasm has been crossed. Opus 5.5 few shotted a fully working Figma for me. In the past year I have been trying to benchmark vibe coded apps and see how good they get and this week it did it with very very little guidance from me. I basically just told it reach feature…

I rewrote my website in Swift

GeoRadios – Spin a globe, hear what's on the radio there

PS2 games statically recompiled to WebAssembly

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

Skills Hub, a desktop app for managing AI agent skills

A cross-platform desktop app to manage Agent Skills in one place and sync them to multiple AI coding tools’ global skills directories — “Install once, sync everywhere”.

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…

Plimsoll, a self-hosted sandbox for code your AI agent writes

A sandbox service for running untrusted, agent-authored code that reports the isolation boundary each run executed behind. Lessons, no clone needed: https://plimsollmark.github.io/plimsoll/trainers/

BraiNOTES, handwritten notes on your lecture PDFs in a browser tab

In August, I posted here about TeXbrain, a LaTeX editor that runs completely in the browser, with no need for an account or server. (I didn't excpect it to get that much feedback, bug reports and help from here!) This is the same idea for the other half of my studies, the…

LLMxRay an open-source observability tool for LLMs

LLMxRay — Local LLM Observatory. Full observability interface for Ollama: chat, streaming, reasoning, RAG, introspection, metrics.

Mira, AI Walking Tours

Timur's Chess – A 14th century chess variant with giraffes

My weekend vibecoding project was to attempt to resurrect a 14th century chess variant favored by the Central Asian warlord Timur (Tamerlane). There are giraffes, elephants, citadels, and you can promote up to 2 additional kings! theres a working AI chess engine and relatively…

BetterWispr – Free, open-source dictation for Mac

Littleguys – Claude Code, Codex and OpenClaw agents in your menu bar

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…

ManimGX – Manim's API on a Rust/wgpu engine, for 3D videos in Python

Video as code took off with the Opus 5.5 release. People now make videos by writing code, with Remotion, HyperFrames and others. We wanted the same for 3D videos. You can use something like Blender, but it's heavy to install and slow to render. So we made ManimGX: - Lightweight:…

A functioning Celery Man computer

Hi HN! It dawned on me that the latest AI models (Minimax H3 Max / Audio, GPT-6 Luna) can finally recreate the computer from the classic Tim & Eric Celery Man sketch. I spent a few days creating it: it has 100% parity with the original script, plus anything you ask for (doggy…

AsoBeast – Open-Source ASO Rank Tracker for App Store and Google Play

Open source ASO tool and keyword rank tracker for the Apple App Store and Google Play. Self-host with Docker, or use the hosted service. MCP server built in.

A simple to-do app for iPhone, Mac, and your agent

Yeah Nah – a BS score for Australian job ads

Babytalk: Offline speech to text and text to speech on ESP32

I have been playing with a lot of $20 devices with no keyboards or screens. I wanted to use speech to interact with them, but without it having to run through a cloud service or use a fixed command vocabulary. I worked with Claude to implement high performance 4bit int kernels…

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…

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

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.

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…

OldRoll, a free vintage photo editor for the browser

OldRoll Web brings vintage camera effects and film-inspired filters to your browser. Give everyday photos a nostalgic look without installing an app, with all creative assets free to use.