Fynn IDE

Fynn IDE is a complete code editor docked inside the Unity Editor. Project tree, tabs, syntax highlighting, project-wide search, a console, and fully customisable themes, all in one window you can dock wherever you like.

Press Ctrl+S and Unity recompiles immediately. Compiler errors appear in the built-in console, and double-clicking one jumps straight to the line that caused it.

Made with VRChat creators in mind

• UdonSharp syntax highlighting alongside C#
• New U# Script creates the script and its UdonSharpProgramAsset together, in one step
• Built-in snippet sets for both C# and UdonSharp
• Editor only, so nothing is added to your avatar or world uploads

Writing code

• Tabbed editing with unsaved-change indicators, middle-click to close, Ctrl+Tab to flip back
• Undo and redo that group your typing sensibly instead of one character at a time
• Auto-indent, bracket auto-close, block indent with Tab and Shift+Tab
• Ctrl+/ to comment, Ctrl+D to duplicate a line
• Lightweight completion from your open file, C# keywords, your own word list, and snippets
• Word wrap with Alt+Z, and wrapped lines keep their indentation so nesting stays readable
• Fold classes, methods, #region blocks and braces from the gutter, and your folds survive a recompile

Finding things

• Ctrl+P to fuzzy-search every file in the project
• Ctrl+F and Ctrl+H to find and replace, with Replace All as a single undo
• Ctrl+Shift+F and Ctrl+Shift+H to search and replace across the whole project, grouped by file
• Reference counts on classes, methods, fields, and properties. Click one, or press Shift+F12, to see every place it is used and jump there

Console

• Runtime logs and compiler errors in one place, with Error, Warning, and Info filters
• Live counts, AutoScroll, and Clear
• Double-click any entry to open the file at that line

Make it yours

• Three built-in themes: Fynn Dark, Unity Dark, and Twilight
• Import any VS Code colour theme
• Background wallpaper images with opacity control
• A live Theme Editor to build your own, and save it as JSON to share

Nothing gets lost

• Saving preserves your file's existing line endings and encoding
• Unsaved work survives Unity recompiling
• Open tabs come back after restarting the Editor
• If a file changes outside Fynn IDE, you're asked whether to reload or keep both versions
• While the window is focused, Ctrl+S won't save your scene and Ctrl+P won't enter Play mode

Good to know — This is not a VS Code replacement and can't run VS Code extensions (they need a Node.js host that can't exist inside Unity; theme and snippet files are supported however). Completion is deliberately small and fast rather than a language server.

Licence

Your purchase grants a licence for one person to use Fynn IDE. You may install it on multiple computers that you personally own or use.

You may

• Use Fynn IDE for personal and commercial projects.
• Use it for client, commission, employer, and team projects.
• Sell and distribute code, games, Unity projects, VRChat avatars, and VRChat worlds created using Fynn IDE.
• Modify Fynn IDE for your own use.
• Share, modify, and redistribute themes, including themes supplied with Fynn IDE.

You retain full ownership of the code and content you create. No attribution or royalties are required.

You may not

• Share, resell, redistribute, or give away Fynn IDE.
• Share the Unity package, source files, download, or purchase access.
• Include Fynn IDE inside a project or package distributed to another person.
• Upload Fynn IDE to a public repository or public download.
• Use substantial parts of Fynn IDE to create a competing code editor.

Each person who directly accesses or uses Fynn IDE must own their own licence.

Fynn IDE may be stored in a private source-control repository only when everyone with access owns a valid licence.

See the included LICENSE.md file for the complete licence terms.