Dev tools in one static site, no framework, no server
A collection of 20+ free online tools for developers, writers, and productivity. No signup required.
What it does
51 free tools that run entirely in your browser. No signup, no data sent to servers. Count words, characters, sentences, and paragraphs instantly. Convert text between UPPER, lower, Title, camelCase, snake_case, and more. Remove duplicate lines from text, keeping unique entries only. Sort lines of text alphabetically, numerically, or by length. Remove extra whitespace, blank lines, and clean up messy text. Convert text to spoken audio using your browser. Choose voice, speed, and pitch. Encode special characters to HTML entities or decode them back. Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text. Convert colors between HEX, RGB, and HSL with a live preview. Decode and inspect…from devtools.fit
More dev tools this month
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Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 2d ago · opentrailpaper.com
Launched alongside, August 2026
the whole month →- TL
Life & fun · 10d ago · louisabraham.github.io
- SA
Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io
I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
AI · 17d ago · simedw.com