A free, open-source developer toolbox.
27 essential utilities in one cross-platform app — JSON, YAML, JWT, hashes, regex, diff, cron, and more.
- Free and open source. No subscription, no telemetry, no account required. Every tool runs locally — your data never leaves your machine.
- Truly cross-platform. macOS, Windows, Linux, and Web from one Flutter codebase. Same UI, same keyboard shortcuts, every desktop.
- Built for developers — especially Flutter devs. JSON → Dart class generation, Material-style color picker, and 25 more daily-driver tools.
- Keyboard-first.
⌘K/Ctrl+Kopens a fuzzy command palette over every tool. Star your favourites; recently used tools surface automatically. - Light and dark themes. Toggle from the sidebar; on macOS and Windows 11 the native window chrome follows along.
A free alternative to DevUtils (Mac, paid) and DevToys (Windows-first), with extra tools aimed at the Flutter ecosystem.
- Base64 — text and images, with side-by-side preview
- URL — encode and decode query strings
- HTML — entity encode/decode, including an attribute-safe mode
- JWT — decode, debug, verify with HS256 / HS384 / HS512
- JSON — pretty, minify, find, object-tree view, convert to YAML
- XML — pretty, convert to JSON
- YAML → JSON — round-trip your config files
- CSV ⇄ JSON — both directions, with table preview and configurable delimiter (
,;\t|) - SQL formatter / minifier — uppercases keywords, breaks clauses onto their own lines, strips comments
- String case converter — camelCase, snake_case, kebab, PascalCase, SCREAMING_SNAKE, COBOL-CASE, dot.case, path/case, Title, Sentence, UPPER, lower
- JSON → Dart class — generate null-safe Dart models with
fromJson/toJson, toggle nullable and immutable - Number base — convert between BIN / OCT / DEC / HEX with a bit-grid and bitwise operations (AND, OR, XOR, NOT, shifts) across 8/16/32/64 bits
- Markdown — write with live preview using GitHub-flavored Markdown
- Lorem ipsum — paragraphs / sentences / words, optional "Lorem" prefix
- Password — random + memorable + passphrases, with character class toggles
- QR code — text or URL, with optional embedded image
- UUID — generate and decode v1, v4, v5, v6, v7, v8
- Hash — MD5, SHA-1/224/256/384/512 and HMAC variants
- File hash — drop any file, get all five checksums plus a built-in hash verifier
- Text & JSON diff — line-level diff with
+/-highlighting and side-by-side gutters; "JSON-aware" mode pretty-prints both sides first - Regex tester — live matches, cheat sheet, case sensitivity
- Hex viewer — drop a file to see a classic offset / hex / ASCII dump
- Color picker — HEX, RGB, RGBA, HSL, HSLA, HSB, CMYK conversions with a color wheel
- Unix timestamp — seconds / milliseconds / microseconds ↔ ISO 8601, RFC 2822, ordinal, day-of-year
- Cron expression — human-readable description + the next N runs (5/10/20/50) in your chosen timezone
- Image format converter — between common formats (desktop only)
- Developer news — RSS reader for The Hacker News, DZone, MacRumors, Slashdot
| Shortcut | Action |
|---|---|
⌘K / Ctrl+K |
Open the command palette (fuzzy search across all tools) |
↑ / ↓ |
Move between palette results |
↵ |
Open the highlighted tool |
Esc |
Dismiss the palette |
| ★ on any palette row | Pin that tool to the sidebar's Favorites section |
Recently opened tools surface automatically under Recent in the sidebar.
| Command Palette Search | Number Base Converter |
|---|---|
 |
 |
| Hash Generator | JSON Parser and Converter to YAML |
 |
 |
| QR Code Generator | RegExp Tester |
 |
 |
| Unix Time Converter | JWT Debugger |
 |
 |
| Platform | Status | Notes |
|---|---|---|
| macOS | ✅ Primary target | Hidden titlebar, native sidebar acrylic, brightness-synced window chrome |
| Windows | ✅ Supported | Mica effect on Windows 11; standard chrome on Windows 10 |
| Linux | ✅ Supported | Standard window chrome |
| Web | ✅ Supported | Try in your browser. Image Format conversion is disabled (requires direct file-system access) |
Download the latest version from the Releases page.
Requires Flutter 3.22+.
git clone https://github.com/Jamalianpour/open-dev.git
cd open-dev
flutter pub get
flutter run # native (auto-detect)
flutter run -d chrome # web
flutter run -d macos # macOS
flutter run -d windows # Windows
flutter run -d linux # LinuxTo produce release artifacts:
flutter build macos # macOS .app
flutter build windows # Windows exe
flutter build linux # Linux bundle
flutter build web # static web bundle
dart run msix:create # Windows MSIX installerOpen Dev follows a single-registry pattern: every tool is declared once in lib/utils/tool_registry.dart as a ToolEntry. The sidebar, the PageView, the dashboard cards, the search index, and the command palette all read from that single list — so adding a new tool is a one-line change.
lib/
├── main.dart # window setup + theme listener
├── utils/ # pure logic per tool (testable, no Flutter imports)
├── views/ # one StatefulWidget per tool
├── widgets/ # shared widgets (DataWidget, command palette, sidebar)
└── utils/tool_registry.dart # ⬅ single source of truth
See CLAUDE.md for deeper architecture notes and CONTRIBUTING.md for the four-step "add a tool" guide.
Pull requests are welcome. The CONTRIBUTING.md guide walks through:
- Setting up the project (
flutter pub get, running on each platform) - The four-step recipe for adding a new tool
- Conventions for shared widgets, code editors, file pickers, and theming
- Things to avoid (web-incompatible imports, hard-coded page indices, committing
DEVELOPMENT_TEAMIDs)
CI runs flutter analyze and flutter test on every PR.
Good first issues live on the Issues tab — pick anything labelled good first issue or propose a new tool.
MIT © Mohammad Jamalianpour.
If Open Dev saves you time:
- ⭐ Star the repo — the easiest way to help others discover it
- 🐛 File an issue when you hit a bug or want a new tool
- 🤝 Send a PR — see CONTRIBUTING.md
- Email: jamalianmjp@gmail.com
- Telegram: @j_mohada
- Issues / discussions: GitHub