🛠️ All DevTools

[Other] WebGL2 powered visualization framework

[Other] Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing I launched NumPad v1 on here a few years ago, and back then it wasn&#x27;t much more than a thin CodeMirror wrapper around the calculator engine I&#x27;d written.<p>Now I&#x27;ve rewritten it as a PWA that supports multiple documents, persists them to IndexedDB, and has a syncing service for paying customers. Syncing is handled by Automerge[1] under the hood, which <i>should</i> make it relatively easy to get document sharing working too.<p>[1] <a href="https:&#x2F;&#x2F;automerge.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;automerge.org&#x2F;</a>

[Other] NativeJIT: A C++ expression –> x64 JIT

The Chan-Zuckerbergs stopped funding social causes

Use keyword-only arguments in Python dataclasses

China Dominates 44% of Visible Fishing Activity Worldwide

A self hosted virtual browser that runs in docker and uses WebRTC.

[Code Quality] Error handling in Rust

🔥 Turn entire websites into LLM-ready markdown or structured data. Scrape, crawl and extract with a single API.

Earth is trapping much more heat than climate models forecast

A visual no-code theme editor for shadcn/ui components

[Other] An LLM-powered knowledge curation system that researches a topic and generates a full-length report with citations.

FULL v0, Cursor, Manus, Same.dev, Lovable, Devin, Replit Agent, Windsurf Agent, VSCode Agent, Dia Browser, Trae AI & Cluely (And other Open Sourced) System Prompts, Tools & AI Models.

21 Lessons, Get Started Building with Generative AI 🔗https://microsoft.github.io/generative-ai-for-beginners/

Building a modern alternative to Salesforce, powered by the community.

America's Coming Smoke Epidemic

[Other] We accidentally solved robotics by watching 1M hours of YouTube

[Testing] Show HN: A tool to benchmark LLM APIs (OpenAI, Claude, local/self-hosted) I recently built a small open-source tool to benchmark different LLM API endpoints — including OpenAI, Claude, and self-hosted models (like llama.cpp).<p>It runs a configurable number of test requests and reports two key metrics: • First-token latency (ms): How long it takes for the first token to appear • Output speed (tokens&#x2F;sec): Overall output fluency<p>Demo: <a href="https:&#x2F;&#x2F;llmapitest.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;llmapitest.com&#x2F;</a> Code: <a href="https:&#x2F;&#x2F;github.com&#x2F;qjr87&#x2F;llm-api-test">https:&#x2F;&#x2F;github.com&#x2F;qjr87&#x2F;llm-api-test</a><p>The goal is to provide a simple, visual, and reproducible way to evaluate performance across different LLM providers, including the growing number of third-party “proxy” or “cheap LLM API” services.<p>It supports: • OpenAI-compatible APIs (official + proxies) • Claude (via Anthropic) • Local endpoints (custom&#x2F;self-hosted)<p>You can also self-host it with docker-compose. Config is clean, adding a new provider only requires a simple plugin-style addition.<p>Would love feedback, PRs, or even test reports from APIs you’re using. Especially interested in how some lesser-known services compare.

[Other] 4-10x faster in-process pub/sub for Go

[API/SDK] Show HN: SmartStepper – Multi-Step Form Library with Config-Based Flow I just released SmartStepper v2 – a declarative and config-based way to handle multi-step forms in React.<p>It lets you define orchestration (next, previous steps), validation, and views via a single config object. No more if&#x2F;else spaghetti or scattered state.<p>GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;Miladxsar23&#x2F;smartstepper">https:&#x2F;&#x2F;github.com&#x2F;Miladxsar23&#x2F;smartstepper</a> Demo: <a href="https:&#x2F;&#x2F;smartstepper-demo.vercel.app" rel="nofollow">https:&#x2F;&#x2F;smartstepper-demo.vercel.app</a> Docs: <a href="https:&#x2F;&#x2F;github.com&#x2F;Miladxsar23&#x2F;smartstepper#readme">https:&#x2F;&#x2F;github.com&#x2F;Miladxsar23&#x2F;smartstepper#readme</a><p>Would love feedback, suggestions, or examples if anyone tries it!