General Bots Calendar vs Open Sunsama
General Bots Calendar
generalbots.orgOpen Sunsama
opensunsama.comSide by side
| Figure | General Bots Calendar | Open Sunsama |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 2 |
| Spec score · AI Calendar Assistants | 8.2 (#9) | 8.5 (#4) |
| API | The product page describes REST endpoints for creating, reading, updating, and deleting events and checking free/busy availability. | The REST API covers tasks, subtasks and time blocks and uses API keys with selectable scopes. |
| Calendar sync | The documentation says Calendar syncs with other apps and lists CalDAV servers as a calendar service integration. | Yes |
| License | The product page says the full source is available under AGPLv3. | The repository uses a custom Open Sunsama Non-Commercial License dated 2024–2026, permitting personal, educational, nonprofit, non-commercial open-source, and evaluation use. |
Plans
In their own words
General Bots Calendar
General Bots Calendar is a self-hosted team calendar for scheduling events, reminders and tasks. Users can request meetings, calls or reminders in natural language; invitations are sent automatically, and an availability endpoint can suggest open booking slots. The calendar has day, week, month and agenda views, mini-calendar navigation and keyboard shortcuts. It supports all-day and recurring events, personal reminders with lead time, and multiple calendars. Tasks with due dates appear alongside events, and completing a task updates its status on the calendar. REST endpoints cover event creation, reading, updating and deletion, plus free/busy checks. Calendar sync includes CalDAV servers. The calendar runs on customer-owned infrastructure and keeps data on the customer’s hardware; the full source is available under AGPLv3. Deployment is described as a self-contained Docker setup on a VM or bare metal. The Self-Hosted plan costs nothing, with unlimited users and operations and no per-user licensing fees.
Open Sunsama
Open Sunsama is a task manager and daily planner built around a board of days and calendar time blocking. Move tasks from a backlog to a daily board; unfinished work rolls over to tomorrow. Focus mode times a task and tracks actual time against its estimate. It syncs Google Calendar, Outlook, and iCloud, with support for multiple accounts. Time blocks stay in Open Sunsama rather than being copied to Google or Outlook calendars. Its hosted MCP server connects to Claude, ChatGPT, Cursor, and other MCP clients through OAuth and provides 24 tools. The REST API covers tasks, subtasks, and time blocks, with selectable API-key scopes. Users can also self-host the web app, API, MCP server, and PostgreSQL database using Docker Compose. The free plan costs nothing for personal use. The non-commercial license limits production use by companies, and there is no one-click export button. Desktop apps are available for Mac, Windows, and Linux; phones use the mobile web app, as no native phone app is available yet.