How can we help?

Quillon is available for free in the App Store. Just search for "Quillon" or use the download link on quillon.app. It requires macOS 15 Sequoia or later.

Yes! Quillon is completely free with all features included. No subscriptions, no paywalls, no feature gates. Everything you see is what you get.

Quillon requires macOS 15 Sequoia or later. It's a Universal binary that runs natively on both Apple Silicon and Intel Macs.

Quillon supports syntax highlighting for 20+ languages including Swift, Python, JavaScript, TypeScript, HTML, CSS, JSON, YAML, XML, Markdown, Shell/Bash, and SQL. More languages are being added in future updates.

Yes! Quillon supports full POSIX ERE (Extended Regular Expressions) for both single-file and multi-file find and replace. Use the Find panel (⌘F) and toggle the "Grep" option to enable regex mode.

Absolutely. Quillon is built with performance in mind — it handles files with 100K+ lines without stuttering. Syntax highlighting is applied incrementally so even large files stay responsive.

Use ⇧⌥F (Shift+Option+F) or go to Edit → Format Document. This works for JSON, XML, and HTML files. For unsupported formats, the shortcut silently does nothing.

Go to File → New Project and choose a folder. Quillon creates a .quillonproject file that stores your project's file and folder references. You can also drag a folder onto Quillon's dock icon to open it as a project.

Click the encoding indicator in the status bar (e.g., "UTF-8") to see all available encodings. Select a new one to re-save the file in that encoding. Quillon auto-detects encoding on open.

Yes! Go to Quillon → Settings → Menus & Shortcuts to customize any keyboard shortcut. Click on a shortcut, then press your desired key combination to remap it.

Go to Quillon → Settings → Themes. Quillon includes 6 built-in color schemes for both light and dark mode. You can also import custom themes using .quilloncolors files.

Yes! Quillon themes are stored as .quilloncolors JSON files. You can create your own or download community themes and import them via Settings → Themes → Import.

Try these steps in order:

1. Make sure you're running macOS 15 Sequoia or later.
2. Check the Mac App Store for updates — a fix may already be available.
3. Delete the app's preferences: in Terminal, run defaults delete com.aretyx.quillon and relaunch.
4. If the issue persists, email us with a description of what happened. Attaching the crash report (from Console.app → Crash Reports) helps us fix it faster.

Quillon is sandboxed for your security. It can only access files you explicitly open (via File → Open) or folders you add to a project. If you're having trouble, try re-adding the folder through the Disk Browser panel — this grants Quillon persistent access via security-scoped bookmarks.

Use Quillon → Send Feedback in the menu bar, or email us directly at [email protected]. Please include the steps to reproduce, what you expected to happen, and your macOS version.