🛠️ All DevTools

Show HN: Sidenote – comment on your rendered blog, an LLM writes the Git diff

Show HN: A bedside camera detects REM sleep and agrees with a clinical EEG I build a device called the INSPEC that detects REM sleep from a bedside infrared camera instead of electrodes. It watches the face under IR light and measures frame-to-frame pixel variance in the eye region. During quiet sleep the face is stable. During REM the eye movements under the lids produce measurable variance, which the device aggregates over time before it flags a REM period. Toss detection, whole-frame motion rejection, and face tracking filter out body movement and out-of-frame periods.<p>After I gave a talk on contactless REM detection, a sleep lab loaned me a clinical-grade EEG device. I recorded a full night wearing the EEG with the camera running at the bedside.<p>I scored the EEG with three independent sleep stage classifiers: ez6 and ez6moe from ezscore, and DreamentoScorer from Dreamento. The REM periods fell at the same times the camera had flagged REM from the video. The long REM periods late in the night, around hours three, five, and seven, matched in every classifier.

Show HN: Osint tool that finds exposed files on domains hey guys, wanted to show one of my side projects i just made public.<p>the idea is basically another osint tool for pentesters and bug bounty hunters. it watches certificate transparency logs and checks newly-seen domains for exposed stuff like .env files, open .git dirs, config files, db dumps and so on, and puts whatever it finds into a searchable db. you just search a domain (or part of one) and see what&#x27;s exposed.<p>it&#x27;s read-only and free. one thing i&#x27;ve been thinking about adding is a way to register for certain keywords and get notified when something new shows up for that search.<p>would love to hear if you have other ideas for useful features, and also ideas for how to reduce abuse of the data, since that&#x27;s the part i&#x27;m least sure about.<p><a href="https:&#x2F;&#x2F;search.cerast-intelligence.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;search.cerast-intelligence.com&#x2F;</a>

Show HN: Social and context-aware AI platform to do math Hi HN,<p>This is ProofTree, and in TLDR: it is a platform where you can chat with an AI to do math, the way you already do, with context-awareness and knows how you personally do math, connected to the fora of other live human mathematicians. So, when you are talking to an AI about a proof at 3 am, and you need a human expert looking at it, or a discussion around it, like you do on StackExchange, this is it!<p>You need an approved email account to use it, so please write here if you would live to try it out.

Cursed circuits #5: capacitance multiplier

Understanding B-Tree Indexes in PostgreSQL: A Comprehensive Guide– Part 1

The full stack of terminals explained

Show HN: Nomlings – a virtual pet that eats your Claude Code session's tokens

Jim Keller's startup is building a factory to mass-produce small chip fabs

Show HN: Sun light and path calculation for photography I created this app to accurately calculate light windows like Golden hour, blue hour, etc. for a particular city&#x2F;location. It helps you plan your photography time by knowing the exact time and direction of sun. It uses swiss ephemeris on the backend to calculate all the path and timings for most accurate data.<p>It also has a 3D view of the sun&#x27;s path on any day and at any point of the day for the location. Looking at the sun&#x27;s direction and angle can help you plan your shoot correctly.<p>It is a simple app with no sign-in needed or any ads. Hopefully it helps folks out there. Open to feedback&#x2F;request for features.<p>Considering an integration with weather APIs if this gains traction and people find it helpful

Moving back home used to be a sign of failure. Now it shows financial savvy

Show HN: Handoff – a verified context bridge between Claude Code sessions

Show HN: I hated how much my 12-year-old played Roblox, so we built our own FPS I&#x27;m a father of two, 7 and 12. They are obsessed with Roblox, especially Rivals.<p>Like a lot of parents, we did not love it. We tried the usual things: block it, limit it, set timers.&quot; It became a daily battle, a lose-lose situation.<p>So I flipped the problem.<p>Instead of fighting what they loved, I decided to lean into it, but with a twist.<p>Why just play an FPS when you could build one together?<p>My kids became the PMs. Claude and I became their engineer.<p>I was shocked by how fast we moved. We picked a name, Cooked and started building.<p>Get in. Lock in. Get cooked!<p>In the first 3 hours, we had an actual FPS we could play together in the browser.<p>Next day I invited my friend&#x27;s two kids over. Suddenly, I had four PMs.<p>We had 3 laptops, 1 iPad and 1 iPhone.<p>So in 30mins we added mobile support and could play all 5 together.<p>The kids would ask for features:<p>&quot;Can we have a rocket launcher that knocks people off the map?&quot;<p>&quot;The knife should stab faster when you hold it.&quot;<p>I know almost nothing about FPS design, so they were the experts. They explained what they wanted. We turned that into prompts. Claude would implement it.<p>We would reload the page and play it 10 mins later.<p>It&#x27;s the most fun I&#x27;ve had building software in years. My kids are proud of it.<p># Here&#x27;s how Cooked is cooked.<p>The architecture<p>- It&#x27;s just a web page. TypeScript + Three.js. - No game server. Multiplayer runs over a P2P WebRTC mesh. - Supabase is only the matchmaker. It handles presence and the WebRTC handshake. - It is very cheap to run. Static site plus a few Cloudflare edge functions for TURN relay. - Bots fill empty rooms. Each bot gets a random loadout and play style.<p># What worked and what didn&#x27;t<p>I have been writing software for 20 years. For the last 9 years, as CEO of Krisp.ai, I have not had much time to program myself. I missed it.<p>Claude changed it. I obsessed with this side project for the last 2-3 weeks.<p>First, building a project with your kids is a great way to bond. It gives you shared interests and real quality time.<p>Second, I wanted to understand the limits of Claude today and how we can apply this at Krisp. This helps me stay grounded.<p>Opus 4.8 is extremely good at architecting application systems, researching references, and implementing algorithms.<p>I would tell it things such as &quot;research how the weapon system is designed in Roblox, Diablo, Fortnite and come up with a proposal on how to do this in Cooked&quot;. It would come up with an impressive backlog and I would just say &quot;Go&quot;.<p>Where it was really weak was UI design. It simply couldn&#x27;t detect&#x2F;see obvious design problems.<p>I’ve tried to implement a loop with a game designer agent, UI designer and system architect. While the research, reasoning were top-notch, the system failed due to bad design taste and the inability to see images properly and spot problems there.<p>Interesting fact. It really failed miserably when I challenged it to design and draw &quot;hands&quot; that hold the weapons. I also have struggled with building decent maps. It lacks imagination and fails even after providing a lot of guidance.<p>Another interesting fact. This morning, I gave the same problem of “drawing a hand” to Fable and it drew it from first-shot, for all weapons. Very impressive.<p># Why I&#x27;m sharing this<p>Two reasons.<p>One: if you&#x27;re a parent fighting the same screen-time battle, consider flipping it. Building the thing they love, with them, turned a source of conflict into a shared creative project. My 12-year-old now understands feature scoping. My 7-year-old has strong opinions about explosion sizes.<p>Two: AI coding tools have crossed a line. A dad who is not a game developer, together with four kids, built a real multiplayer browser FPS that their friends actually play.

A sociotechnical threat model for AI-driven smart home devices

It's not about physical vs. digital games, it's about ownership

Home made GPU escalated quickly [video]

Show HN: KiCad in the Browser KiCad, a PCB EDA suite is now working in a browser, you can try it at the link, there&#x27;s a demo project or you can bring your own. Firefox is best, Chrome is good, Safari is &quot;working&quot;.<p>We’re Emergence Engineering, a dev shop from Hungary, mostly working with rich text editors, CRDTs. PCBJam started as my (Viktor, CTO, ex-electrical engineer) hobby project but as time went on I put more and more energy into it, and a product started shaping up in my head, in the last few months we’ve started to focus on this project a bit more, and this is the first MVP~ish result.<p>This project is a ton of fun, ton of learning, ton of improvements over improvements:<p>- I thought there must be ways to emulate the PCB canvas OpenGL code on the web. And yes, there are a lot of ways, all of them very buggy. Turns out it’s faster to just write WebGL code that works with KiCad’s Graphics Abstraction Layer if you add the right intermediate debugging steps. I (with Claude) implemented the features and compared them to native at every step, then the app loaded up the first time and just worked. I spent weeks hunting weird emulation bugs before that.<p>- There was an old wxWidgets web port as a starting point that helped a lot, bringing it up to the level KiCad needed is a long (and still ongoing) task. Thanks ahilss!<p>- Pthreads on the web: with Emscripten it’s possible to port multithreaded apps (used by DRC, software 3D renderer). A lot of Emscripten features (Asyncify, Pthreads, native exceptions) are in a war with each other, but it’s possible.<p>- Asyncify with native exceptions: Asyncify (used to make the WASM code suspend then call into the JS land, emulating blocking C++ calls by rewriting the WASM directly) is not compatible with native exceptions, even on the latest Binaryen version it can’t suspend inside catch arms. If you write a new Binaryen pass then it can, making the bundle 30-40% smaller and the app load in a second instead of 10.<p>- Optimizing bundle size is a fun game. We just moved Open CASCADE into a separate lazy-loaded WASM module, moving from 180 to 130 MB (24 MB brotli), still on -O1. -O2 &#x2F; -Oz etc will be more work than it looks.<p>And a ton more problems like these above on a daily basis.<p>A few months ago I had a barely loading laggy pcbnew that crashed when you looked at it wrong, now we have the whole application working. I should say with quite a few bugs still, but now it feels pretty close to native.<p>There’s a lot of built up knowledge &#x2F; code that we want to release as blogposts, mainline our changes to Binaryen &#x2F; KiCad &#x2F; wxWidgets, but I want to focus on the release first. Our wxWidgets port is quite close to the core, the KiCad is ~150 changed core files (mostly build scripts, some code changes too). The goal is to keep as close to the mainline as possible, and merge eventually.<p>We’ll have a free tier for sure and something around $30&#x2F;mo for bigger&#x2F;closed projects, optional paid AI integration &#x2F; self hosting &#x2F; enterprise features &#x2F; native &amp; mobile version down the line.<p>The goal is to build a product on top of KiCad (collaboration, AI integration, sharing, integrations), kind of like what Red Hat did with Linux back then. We’re heads down making it functional and have the first version up in a ~month or so.<p>And of course we’re standing on the shoulders of the people who made KiCad &amp; wxWidgets and we want to give back and contribute as much as possible, if you have an idea on how to do that best let me know, I released a few moderately successful open source projects, but I’ve never been a contributor. All of the front-end code is GPL (it has to be) and you can run this project if you want.<p>You can find the sources at: <a href="https:&#x2F;&#x2F;github.com&#x2F;emergence-engineering&#x2F;pcbjam" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;emergence-engineering&#x2F;pcbjam</a>.<p>Our company site is at: <a href="https:&#x2F;&#x2F;emergence-engineering.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;emergence-engineering.com&#x2F;</a><p>Our crappy LP is at: <a href="https:&#x2F;&#x2F;www.pcbjam.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.pcbjam.com&#x2F;</a>

Persistent file-based planning for AI coding agents and long-running agentic tasks. Crash-proof markdown plans that survive context loss and /clear, plus a deterministic completion gate and multi-agent shared state on disk. Manus-style. Works with Claude Code, Codex CLI, Cursor, Kiro, OpenCode and 60+ agents via the SKILL.md standard.

Marketing skills for Claude Code and AI agents. CRO, copywriting, SEO, analytics, and growth engineering.

Introduction to Compilers and Language Design