🛠️ All DevTools

[Other] I tried Gleam for Advent of Code

[Other] Show HN: UK Butchers Meat Price Tracker Hey all!<p>Long time lurker, thought I would contribute back something to the community (at least the meat eaters in the UK). One thing that&#x27;s been a pain for me to get a good understanding of is what the best price is for online butchers based around the UK. I like high quality meat (including some of the bigger cuts for kamado&#x2F;bbq), and I&#x27;m willing to pay a premium however there isn&#x27;t a single resource that would let me get an overview of what&#x27;s available and price movements over time.<p>For my Xmas meat I didn&#x27;t want to start building out a spreadsheet so I built a price tracker with quite a few convenience features to make it easy to search for certain cuts of meat across commonly mentioned butchers on Reddit and other communities.<p>If you find it useful let me know if there are any features that could help to make it even easier to find the cuts of meat that you&#x27;re looking for!<p>Here&#x27;s the tracker: <a href="https:&#x2F;&#x2F;offer-spider.onrender.com" rel="nofollow">https:&#x2F;&#x2F;offer-spider.onrender.com</a><p>Hosted on Render, built with Nextjs and SQLite. Spidering various custom e-com sites (WooCommerce, Shopify) on a daily basis.<p>My current TODOs: - Search is currently free-text OR. Add AND to allow focussing down a search, and select from facets&#x2F;categories&#x2F;taxonomy - Common search terms to pre-fill - Exposing price over time metrics - Further consolidation of SKUs to an internal taxonomy - More butchers - Expanding to other use cases outside of meat!

[Other] Hacking Google Chrome Source Code: Make Puppeteer work over Redis PubSub

[Other] Chrome DevTools for coding agents

[Other] Free online developer tools Free online developer tools for encoding, formatting, generating, and security tasks All processing is done in your browser - your data never leaves your device

[Testing] Security testing for vibe coded apps Automated security testing for Vibe-coded applications. Identify security vulnerabilities in 2 clicks.

[Other] Remote control your mac from smartphone Put your dev environment in your pocket with PocketCorder. Control your Mac from your iPhone or iPad with low latency and high efficiency. Perfect for developers who need to check processes or run commands anywhere—from bed to a cafe. Features include secure Cloudflare Tunnel access, one-tap command shortcuts, and a focused App Mode. Setup is instant via QR code; no complex VPNs needed. Download the free Mac companion app to get started.

[API/SDK] Stop rebuilding uploaders | ivandt Ivandt is a high-performance data onboarding SDK for modern apps. Embed a native importer (no iframe) to handle messy CSV/Excel entirely in-browser with web workers, schema-based or schema-less + AI type detection, powerful validation and transforms, Smart Fix suggestions, and flat pricing with unlimited imports.

[Other] Free online developer & utility tools Access 50+ free online tools including JSON formatter, JWT decoder, salary calculator, SEO tools, calculators, and more. No sign-up required.

[Other] Show HN: Browser4 – an open-source browser engine for agents and concurrency Hi HN,<p>I’d like to share an open-source project we’ve been working on for a while: <i>Browser4</i>.<p>The motivation came from a recurring frustration: most browser automation tools (Playwright, Selenium, Puppeteer) are excellent for <i>human-written scripts</i>, but start to show friction when used as a <i>core execution layer for AI agents</i> or at very high concurrency.<p>So instead of building “another wrapper around Playwright”, we experimented with a different direction: <i>designing a browser engine where AI agents are first-class citizens.</i><p>### What Browser4 is<p>Browser4 is a browser automation engine built on <i>native Chrome DevTools Protocol (CDP)</i>, with a focus on:<p>* <i>Coroutine-safe concurrency</i> (designed to run many browser sessions in parallel)<p>* <i>Agent-oriented APIs</i> (navigation, interaction, extraction as composable actions)<p>* <i>Hybrid extraction</i>: ML agent driven extraction + LLM extraction + structured selectors + an SQL-like DOM query language (X-SQL)<p>* <i>Low-level control</i> without Playwright-style abstraction overhead<p>It’s written in <i>Kotlin&#x2F;JVM</i>, mainly because we needed predictable concurrency behavior and long-running stability under load.<p>The project is fully open-source (Apache 2.0).<p>### What it’s <i>not</i><p>* It’s not a drop-in Playwright replacement.<p>* It’s not a no-code RPA tool.<p>* It’s not “LLM magic” — LLMs sit <i>outside</i> the browser engine.<p>Browser4 intentionally stays close to the browser execution layer and leaves planning&#x2F;reasoning to external agent loops.<p>### Current use cases we’re testing<p>* Large-scale web data extraction<p>* Agentic workflows (search → navigate → extract → summarize)<p>* Price &#x2F; content monitoring with frequent revisits<p>* High-concurrency crawling where browser startup and context switching are bottlenecks<p>On a single machine, we can sustain <i>very high daily page visits</i>, though we’re still validating benchmarks across different workloads.<p>### Open questions (where I’d love feedback)<p>* For agentic systems, does it make sense to bypass Playwright entirely and work closer to CDP?<p>* Where do you see the biggest pain points when combining LLMs with browser automation today?<p>* Is JVM a reasonable choice here, or is Python still the better tradeoff despite concurrency limits<p>* What abstractions would <i>you</i> want in a browser engine built for AI agents?<p>### Links<p>* GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;platonai&#x2F;browser4" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;platonai&#x2F;browser4</a><p>* Website (light overview): <a href="https:&#x2F;&#x2F;browser4.io" rel="nofollow">https:&#x2F;&#x2F;browser4.io</a><p>Happy to answer technical questions or hear criticism — especially from people running browser automation or agent systems in production.<p>Thanks for reading.

[Database] Show HN: EdgeVec – Sub-millisecond vector search in the browser (Rust/WASM) Hi HN,<p>I built EdgeVec, a vector database that runs entirely in the browser. It implements HNSW (Hierarchical Navigable Small World) graphs for approximate nearest neighbor search.<p>Performance: - Sub-millisecond search at 100k vectors (768 dimensions, k=10) - 148 KB gzipped bundle - 3.6x memory reduction with scalar quantization<p>Use cases: browser extensions with semantic search, local-first apps, privacy-preserving RAG.<p>Technical: Written in Rust, compiled to WASM. Uses AVX2 SIMD on native, simd128 on WASM. IndexedDB for browser persistence.<p>npm: <a href="https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;edgevec" rel="nofollow">https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;edgevec</a> GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;matte1782&#x2F;edgevec" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;matte1782&#x2F;edgevec</a><p>This is an alpha release. Main limitations: build time not optimized, no delete operations yet.<p>Would love feedback from the community!

[Other] Show HN: I built a GitHub application that generates documentation automatically Hi HN,<p>A lot of the dev teams I have worked with had a lot of issues with their documentation. In fact, some of my easiest clients to get were from clients that had &quot;black box&quot; solutions that devs no longer at the company had created. Personally, writing documentation is like grinding nails on a chalkboard.<p>I have been having a lot of fun with building solutions that can run in a distributed way, not something a dev needs to run themselves. And after a significant amount of testing and building out several different solutions, I finally have a solution that is easy to set up and runs in the background continuously to automate the documentation process.<p>I&#x27;m looking for feedback on a few things: - Ease of onboarding, it should be a simple click -&gt; select repos you want to add. - Quality of documentation, our current free accounts have a standard model compared to premium but the concepts are the same. - Dynamic environments: I tried to make this compatible with any random repo thrown at it.<p>Let me know your thoughts

[API/SDK] Show HN: Verani – Socket.io-like realtime SDK for Cloudflare Hi HN,<p>I built Verani, an experimental realtime SDK for Cloudflare Actors (Durable Objects).<p>The goal is to bring a familiar, event-based DX (rooms, emit, channels, lifecycle hooks) to Cloudflare Durable Objects, while handling hibernation correctly.<p>It focuses on - Socket.io-like semantics on top of Durable Objects - Proper Actor hibernation handling (WebSockets survive, state is restored) - Typed API with explicit tradeoffs.<p>It’s early and experimental, but functional. I built it mainly to explore DX and state management patterns on Cloudflare Actors, and I’d love feedback from people who’ve built realtime systems or used Durable Objects.

[Other] I couldn't find a logging library that worked for my library, so I made one

[Database] Show HN: Marmot v2.20 – A distributed SQLite server with MySQL wire compatbility Marmot hits major milestone I&#x27;ve been solo pushing (with help of AI), to really mature out the system. And yesterday I have hit the first milestone where MySQL API is stable enough to make WordPress install and work flawlessly. System is now in a place where you can spin off a cluster, and then spin off many replicas you want to scale out. I wanted to build something that is actually hard with AI, and it&#x27;s been long and tough journey trying various AI tools, and huge amount of learning. I will follow up with a blog post, but since I have all the scripts to help you guys spin up cluster and examples I wanted to put it out there so that you guys can poke holes and help me improve it.<p>Source is available at: <a href="https:&#x2F;&#x2F;github.com&#x2F;maxpert&#x2F;marmot&#x2F;" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;maxpert&#x2F;marmot&#x2F;</a><p>Most fun part is a Wordpress running in cluster: <a href="https:&#x2F;&#x2F;github.com&#x2F;maxpert&#x2F;marmot&#x2F;tree&#x2F;master&#x2F;examples&#x2F;wordpress-cluster" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;maxpert&#x2F;marmot&#x2F;tree&#x2F;master&#x2F;examples&#x2F;wordp...</a><p>Each one of these Wordpress instances is talking to it&#x27;s own &quot;MySQL&quot; but under the hood replication is being done and stored over SQLite DB.

[Database] Turso is an in-process SQL database, compatible with SQLite.

[Other] Building small Docker images faster

[Build/Deploy] Build cloud-native AI Agents Deploy and manage fleets of AI agents and sub-agents as reliably as modern microservices. Built on an open-source golang SDK, run your agents anywhere (localhost, your cloud or ours). You own all of the code, quick deploy in under 2 minutes, Supporting infra and tools (data stores, vector db, memory, etc) included, generous freemium tier to help you get started with something real.

[Other] Playful app idea generator for web/mobile developers What To Build Next is a playful, AI-powered idea wizard that gives developers personalized app ideas based on their goals, skills, interests, and tools. Instead of generic idea lists, it asks thoughtful questions and generates ideas that actually fit you. Each idea includes your chosen intention, industry and tech stack so you can stop scrolling for inspiration and finally start developing.

[Database] Stoolap: High-performance embedded SQL database in pure Rust