Carbon
The facts below are what the maker publishes about Carbon, checked and dated. Our editors have not written about it yet.
The facts
Each one read from Carbon's own pages, with the date it was checked.
What it does
- API
- Carbon provides a REST API with personal API keys that can be scoped by permissions and optionally restricted to project subtrees.checked 11 Oct 2026
- Authentication
- Sync accounts require a password and two-factor authentication through email or an authenticator app; passwords use salted scrypt hashes.checked 11 Oct 2026
- Calendar sync
- Yeschecked 22 Sep 2026
- Collaboration
- With a sync server, Carbon supports multi-device sync, shared projects and tasks, multiple assignees, read/write permissions and cross-workspace federation.checked 11 Oct 2026
- Collaboration and integrations
- Sync-server features include shared projects and tasks, multiple assignees, scoped API keys, webhooks, CalDAV and iCal feeds, Home Assistant, Telegram and configured AI providers.checked 11 Oct 2026
- Connectivity limits
- Uncached attachments and external integrations require a connection, and local reminders depend on app and platform support.checked 11 Oct 2026
- Data deletion
- Recently Deleted allows restoration for 30 days, while deletion uses tombstones and does not erase records from databases or shrink database files.checked 11 Oct 2026
- Data recovery
- Recently Deleted allows restoration for 30 days, while deletion hides records using sync tombstones rather than erasing them from databases.checked 11 Oct 2026
- Integrations
- The feature documentation lists CalDAV, iCal feeds, Home Assistant, Telegram, external webhooks and AI task features through a configured provider.checked 11 Oct 2026
- License
- The public repository identifies its license as GPL-3.0.checked 11 Oct 2026
- Local use
- Local use needs no account and stores data in SQLite for offline work.checked 11 Oct 2026
- Notes and exports
- Notes support rich Markdown, inline images, comments and attachments, with database and attachment export/import and Markdown export for notes and checklists.checked 11 Oct 2026
- Notes and files
- Carbon supports rich Markdown notes, inline images, comments, attachments, database and attachment import/export, and Markdown export for notes and task checklists.checked 11 Oct 2026
- Offline access
- web_and_mobilechecked 22 Sep 2026
- Product
- Carbon combines task management, projects, notes, recurring tasks, time tracking and offline storage.checked 11 Oct 2026
- Purpose
- Carbon combines todo, GTD, project management and time tracking, with local storage, sharing and APIs on a self-hostable sync server.checked 11 Oct 2026
- Recurring tasks
- Yeschecked 22 Sep 2026
- Security
- Carbon is not end-to-end encrypted, and server operators can read stored workspace data, including integration credentials.checked 11 Oct 2026
- Security limitation
- Carbon is not end-to-end encrypted, and server operators can read stored workspace data, including integration credentials.checked 11 Oct 2026
- Self-hosting
- The self-hosted server serves the app and API on port 3069 and stores data in a local data directory; remote access should use HTTPS.checked 11 Oct 2026
Money
- Free plan
- Yeschecked 22 Sep 2026
- Planning
- Views include Inbox, Today, Flagged, Forecast, Plan, Review, Time, Tags and Nearby, with saved perspectives, filters, daily time budgets and project review intervals.checked 11 Oct 2026
- Planning features
- It includes nested projects and tasks, due and defer dates, reminders, recurrence, task dependencies, priorities and saved views.checked 11 Oct 2026
Where it runs
- Platforms
- The project documents a web/PWA, desktop and Android app; its desktop app uses Tauri and Android uses Capacitor.checked 11 Oct 2026
Alternatives to Carbon
- 1
Pomodoist
Free planOpen sourceAndroidiOSWebAPI9.2Free plan - 2
Any.do
Free planAndroidiOSWebmacOS8.8Free plan - 3
TickTick
Free planAndroidiOSWebLinux8.7From $49.99 a year - 4
Routine
Free planAndroidiOSWebLinux8.7From $5 a month - 5
Nozbe
Free planAndroidiOSWebmacOS8.6From $6 a month - 6
Vikunja
Free planAndroidiOSWebAPI8.5From €4 a month