Carbon — Full Feature List

A complete breakdown of what Carbon does. For the overview, see the Carbon project page; to try it, visit carbon.etx.sx.

Capture & Organise

• Quick inbox — capture ideas instantly, process them later.
• Projects — group related tasks together.
• Tags — categorise work across projects.
• Due dates & defer dates — schedule work and snooze it until it’s relevant.
• Priority flagging — mark what matters.
• Recurring tasks — set up repeating work on a schedule.
• Nested tasks — break large items into subtasks.

Views

• Today — everything due today.
• Inbox — capture and process new items.
• Flagged — your current priorities.
• Review — GTD-style project review so nothing slips.
• Nearby — tasks valid at your current location.
• Plan — plan out your day.
• Custom Views — build your own views with powerful filters.

Offline-First & Sync

• Full browser app backed by SQLite — runs entirely in your browser.
• Works completely offline — no connection required to capture or manage tasks.
• Sync when ready — pushes to your own sync server whenever you connect.
• No SaaS — no cloud lock-in, no accounts you don’t control.

Natural-Language Control

Carbon understands plain language — manage tasks the way you’d describe them out loud.

• In-app command box — type something like “add milk to shopping, due Friday”. A server-side tool-loop carries it out and reports exactly what changed, with per-command token-usage tracking.
• Agent API (/api/agent/*) — a small set of granular tools that any LLM can compose:
  • resolve — fuzzy name → ID matching
  • lists, items — read tasks and structure
  • add, complete, update — modify tasks
  • tag, tag-geo — manage tags and location tags
  • nearby, geocode — location lookups
  • Responses use matched/unmatched envelopes so callers know what resolved.
• Security — scoped tokens and per-item write gating keep agent access safe.
• Telegram bot — chat with Carbon in plain language from Telegram. The bot keeps conversation context, so follow-up messages resolve against what came before — “add bread and milk to the shopping list”, then “sausages too”, then “I’ll get bread and sausages from Coles, milk from Aldi” tags each item to the right shop.
• Hermes skill & webhook — drive Carbon from the CLI or any script via the carbon-nl skill and its webhook listener.
• Bulk tagging — add or remove tags across a whole list, tag, query, or set of items in a single call.

Location-Aware Reminders

• Place geocoding — “remind me at the nearest Coles” finds the closest match via OpenStreetMap (Overpass / Nominatim) and geofences a tag to it. Results are cached and rate-limited, and the feature is opt-in per deployment.
• Multi-device location — every signed-in device can report its own GPS as a toggleable source. Name and manage your devices; the freshest accurate fix wins. Home Assistant is just one more source.
• Geofencing — fire reminders when you arrive at or leave a place, via device GPS or Home Assistant.

Collaboration

• Task assignment — delegate tasks to team members.
• Sharing — collaborative projects with read/write access.
• Comments — per-task discussions with @mentions.

Apps & Integrations

• PWA installable — install Carbon as an app on desktop and mobile.
• Desktop app — global quick-add hotkey (Ctrl/Cmd+Shift+A), system tray, and close-to-tray.
• Markdown export — export your lists and tasks as clean, portable Markdown.
• REST API — integrate with Home Assistant, scripts, or anything else.
• Dark / light mode — fits your lighting.

Deploy It Yourself

• Docker Compose setup.
• Runs on your VPS, NAS, or home server.
• Optional authentication.
• No vendor lock-in.

git clone https://github.com/emmertex/carbon.git
cd carbon
docker compose up -d --build

Then open Carbon, and configure a sync server in Settings when you’re ready.