54 Free, No-Ads Developer Tools
Free online developer tools to format, convert, generate, validate, and debug. No sign-up, no ads, no tracking. Most run right in your browser.
Loopkit
A schema-driven SVG animation engine under 5KB with no dependencies. Works with React, server-side rendering and vanilla JS.
Markdown Repository
Query .md and .mdx files by frontmatter with a Firestore-style API. Built for the Next.js App Router. An open source npm package.
Copy Paste Characters
Click to copy symbols, arrows, math signs, Greek letters and currencies as plain Unicode characters. Free, no sign-up, no ads.
Line Chart Race
Turn a CSV into an animated line chart race, with one named line for each column. Play it fullscreen. Your data stays local.
Text Diff
Compare two texts side by side or inline, with character-level highlights shown live as you type. Free, no sign-up, no ads.
What Is My IP
See your public IP address as websites see it, IPv4 or IPv6. Nothing to type or store: open the page and it shows. Free, no sign-up.
Built & Maintained by Varstatt
Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.