Sunday, October 25, 2026 4,350 lists 78,100 records on file
List your app or device

  1. Home
  2. To-do list apps
  3. Carbon

Carbon

On the record

API
Carbon provides a REST API with personal API keys that can be scoped by permissions and optionally restricted to project subtrees.github.com · read 11 Oct 2026
Authentication
Sync accounts require a password and two-factor authentication through email or an authenticator app; passwords use salted scrypt hashes.github.com · read 11 Oct 2026
Calendar sync
Yesgithub.com · read 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.github.com · read 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.github.com · read 11 Oct 2026
Connectivity limits
Uncached attachments and external integrations require a connection, and local reminders depend on app and platform support.github.com · read 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.github.com · read 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.github.com · read 11 Oct 2026
Integrations
The feature documentation lists CalDAV, iCal feeds, Home Assistant, Telegram, external webhooks and AI task features through a configured provider.github.com · read 11 Oct 2026
License
The public repository identifies its license as GPL-3.0.github.com · read 11 Oct 2026
Local use
Local use needs no account and stores data in SQLite for offline work.github.com · read 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.github.com · read 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.github.com · read 11 Oct 2026
Offline access
web_and_mobilegithub.com · read 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.github.com · read 11 Oct 2026
Planning features
It includes nested projects and tasks, due and defer dates, reminders, recurrence, task dependencies, priorities and saved views.github.com · read 11 Oct 2026
Product
Carbon combines task management, projects, notes, recurring tasks, time tracking and offline storage.github.com · read 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.github.com · read 11 Oct 2026

Alternatives to Carbon

Every alternative, ranked