Logo

Free & open source

Free for everyone. Open source forever.

MyDevTools is free and open source under AGPL-3.0. Every tool in the offline desktop app is available to everyone — no plans, no paywalls, no card.

Download for freeView source on GitHub

Free forever

All 80+ tools ship in one desktop app that runs fully offline on your device. There is nothing to unlock and nothing to subscribe to.

  • Every tool, every feature — free for individuals and teams.
  • Fully offline and local-first; your data stays on your device.
  • No card, no trial, no upsell.

Open source under AGPL-3.0

The entire codebase is public on GitHub. Audit the code your secrets pass through, fork it, or help build it.

  • Licensed under GNU AGPL-3.0.
  • Issues and pull requests welcome on GitHub.
  • Star the repo to follow releases.

Popular developer tools

Continue from the platform page into canonical public tool pages.

See all 78 tools

JSON Editor

Format, validate, and edit JSON data with text and tree views. Supports JSONPath queries.

JWT Decoder

Decode JSON Web Tokens locally: header, payload, exp, iat, and nbf. No server upload; signature not verified.

API Client

Test and debug HTTP requests with headers, body, and auth support. A lightweight Postman alternative for your desktop.

Regex Tester

Test JavaScript regular expressions with live match highlighting, flags (g, i, m, s, u), and match counts. Client-side only.

UUID / ULID Generator

Generate UUID v1–v7 or ULIDs with namespace options and bulk copy or download.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings instantly, with UTF-8 support. Runs entirely on your device.