DevTools-X is a free, open-source, offline-first desktop collection of 41 developer utilities for macOS, Windows, and Linux, aimed at developers who want a single lightweight non-Electron app instead of scattering small helpers across browser tabs.

What it is

DevTools-X is a cross-platform desktop application built with Tauri, using a React and Mantine client and a Rust backend, distributed under the MIT licence. The Tauri bundle produces an installer of about 10MB, and the application works offline-first, so the utilities remain available without a network connection. The project is written in TypeScript and is hosted with a homepage at https://devtools.fosslife.com/.

The concrete problem it addresses is fragmentation: developers typically reach for a REST client here, a Base64 decoder there, and a timestamp converter in a browser tab, with many existing helpers restricted to a single operating system. The README frames it directly against devutils, which is macOS-only, and devtoys, which is Windows-only, so DevTools-X exists as an x-platform, non-Electron alternative that puts roughly 41 modules in one place, lighter and with more features than those single-platform equivalents.

Key capabilities

• Sends requests through a basic REST client, alongside a pastebin with gist and a programming scratchpad with support for many languages.
• Uses monaco-editor, the editor used by vscode, so formatting, minification, and editing benefits from vscode-style editor behaviour out of the box.
• Handles encoding and hashing tasks including Base64 text encode/decode, Base64 image encode/decode, text hash calculation (md5, sha etc.), Files MD5, and HMAC Generator.
• Converts and formats structured data: JSON formatter/minify, YAML JSON convertor, SQL formatter, JWT decode, URL Parser, and generating Types and Interfaces from json.
• Processes images with an image compressor/convertor with preview, a bulk image compressor with Rust SIMD, an image cropper, QR code generator, and QR Code Reader.
• Provides front-end and text tooling including a React live scratchpad, CSS live playground, HTML editor and preview, Markdown edit/preview, code/text diff with syntax highlight, and a Regex Tester.
• Generates developer values with a strong password generator, stateless password generator, UUID generator, Cron edit and explain, and mock data with Faker.

Who uses it and how

• Developers on Windows, macOS, or Linux who want one offline app covering encoding, formatting, and conversion tasks instead of separate single-platform tools.
• Backend and API developers who move between the basic REST client, JWT decode, HMAC Generator, and the JSON/YAML/SQL formatters in daily work.
• Front-end developers who use the React live scratchpad, CSS live playground, and HTML editor and preview for quick iteration, backed by monaco-editor.
• Teams and hobbyists who read images and PDFs, crop or compress images in bulk, and diff code with syntax highlight from a single installer.
• Contributors working through contributing.md and the code of conduct, including participants in the hacktoberfest topics the project carries.

Getting started

Prebuilt binaries are produced by a GitHub CI for all platforms and downloaded from the Releases page, or you can clone the repository and run yarn tauri build with the Tauri prerequisites installed; on macOS you must first clear quarantine attributes with xattr -r -c /Applications/devtools-x.app because binaries are not yet signed.

How it compares

DevTools-X sits alongside devutils, which is macOS-only, and devtoys, which is Windows-only, positioning itself as the cross-platform option covering all three operating systems rather than one. It reaches that breadth through Tauri and Rust rather than Electron, which is what keeps the installer around 10MB.

When to use it — and when not

A self-hoster needs only to install or build the application itself, since no database, storage layer, or SMTP is described, but you should expect to work around rough edges: the README notes that not all 41 modules are well tested on all three OSes, and that migrating to tauri v2 introduced minor bugs such as basic CSS breaking or the app not working on a specific platform. Anyone needing a production-guaranteed tool, signed macOS binaries, or a fully tested module set should either report bugs in the issue tracker and wait, or pick a tool with a different assurance level; if the app fails to render, deleting the settings.json file in the Tauri data directory resolves it.

xattr -r -c /Applications/devtools-x.app

https://tauri.app/v1/guides/getting-started/prerequisites

yarn tauri build