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SyncFiddle
What SyncFiddle is
SyncFiddle is a web editor for writing and running HTML, CSS, and JavaScript. It opens in Offline Mode, keeping edits local until sharing is enabled. Users can then send a shared room URL for real-time collaboration, with active collaborators’ cursors labeled by display name. The editor provides keyboard shortcuts, search and replace, multi-cursor editing, bracket and tag highlighting, and code folding. A Format button applies Prettier to HTML, CSS, and JavaScript, while the console can preserve logs across runs. Export downloads work as an HTML file in offline or online mode. Listed uses include pair or mob programming, teaching, study groups, workshops, livestreams, troubleshooting, and interviews. Anyone who knows a room URL can view, edit, and copy its code, so sensitive data should not be entered. SyncFiddle is free on the web, has no deployment options, and is intended for collaboration rather than permanent storage.
Who it suits
SyncFiddle suits educators, learners, interviewers, and teams collaborating on front-end code in a browser. It is useful when shared room editing is more important than long-term storage or deployment.
What it does well
- Free web-based HTML, CSS, and JavaScript editor
- Real-time collaboration through room URLs
- Offline editing before sharing
- Prettier formatting and HTML export
- Useful code navigation and editing tools
What to know first
- Anyone with the URL can edit and copy code
- Inactive rooms may be deleted
- No deployment options
- Absolute data security is not guaranteed
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Service currently free of charge; no plan limits stated | Free |
As syncfiddle.net lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
SyncFiddle combines local editing, browser-based collaboration, and practical code-editing tools at no charge. Its open room access and non-permanent storage model require care with sensitive or important work.
Facts from SyncFiddle's own pages
- Audience
- The site describes SyncFiddle as useful for people collaborating on code in a browser, including educators, learners, interviewers, and troubleshooting teams. · syncfiddle.net, 11 Oct 2026
- Collaboration cursors
- In shared rooms, active collaborators’ cursors show their display-name labels. · syncfiddle.net, 11 Oct 2026
- Deployment options
- none · syncfiddle.net, 23 Sept 2026
- Editor features
- The editor includes keyboard shortcuts, search and replace, multi-cursor editing, bracket and tag highlighting, and code folding. · syncfiddle.net, 11 Oct 2026
- Export
- The editor’s Export button downloads work as an HTML file in both offline and online modes. · syncfiddle.net, 11 Oct 2026
- Formatting and console
- A Format button uses Prettier for HTML, CSS, and JavaScript, and the console can preserve logs across runs. · syncfiddle.net, 11 Oct 2026
- Free plan
- Yes · syncfiddle.net, 23 Sept 2026
- Full-stack runtime
- No · syncfiddle.net, 23 Sept 2026
- Offline editing
- The editor starts in Offline Mode, where code is edited locally until the user enables sharing. · syncfiddle.net, 11 Oct 2026
- Privacy and security
- The privacy policy says it may collect email, cookies, usage data, and IP address, and states that absolute data security cannot be guaranteed. · syncfiddle.net, 11 Oct 2026
- Real-time collaboration
- Yes · syncfiddle.net, 23 Sept 2026
- Room access
- Anyone who knows a room URL can view, edit, and copy its code, so the terms advise against putting sensitive data in the editor. · syncfiddle.net, 11 Oct 2026
- Sharing controls
- link_access · syncfiddle.net, 23 Sept 2026
- Sharing
- Users can share code by enabling sharing and sending others the room URL. · syncfiddle.net, 11 Oct 2026
- Storage limit
- The service is designed for real-time collaboration rather than permanent storage, and inactive rooms may be deleted without a guarantee that content will be preserved. · syncfiddle.net, 11 Oct 2026
- Support
- Users can submit issues, bug reports, and enhancement requests through GitHub Issues; the site also has a contact form. · syncfiddle.net, 11 Oct 2026
- Use cases
- The site lists pair or mob programming, teaching, study groups, workshops, livestreams, troubleshooting, and interviews as use cases. · syncfiddle.net, 11 Oct 2026
- What it does
- SyncFiddle is an online editor for writing and running HTML, CSS, and JavaScript, with real-time collaboration through shared room URLs. · syncfiddle.net, 11 Oct 2026
Where SyncFiddle stands on Freedom251
- Coding Playgrounds#105 of 138
- Code Playground Software#47 of 58