Cal.com vs Nextcloud Calendar
| Tagline | Scheduling infrastructure for everyone, the open-source Calendly alternative | Full-featured CalDAV calendar server built into Nextcloud with sharing and scheduling |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Calendly, Acuity Scheduling |
| GitHub stars | 46k | 3k |
| Language | TypeScript | PHP |
| License | AGPL-3.0 | AGPL-3.0 |
| Self-host difficulty | 3/5 Moderate | 2/5 Easy |
| Deploy options | One-Click Docker Docker Compose Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | 5 days ago | 1 month ago |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Cal.com
- Some enterprise features (e.g. SAML SSO, advanced admin/insights, certain platform features) are gated behind a commercial/EE license even when self-hosting.
- Self-hosting requires PostgreSQL plus configuring numerous environment variables and OAuth credentials for calendar integrations.
- The core code is AGPL-3.0, which imposes copyleft obligations on modified network deployments.
- Upgrades between major versions occasionally require manual database migration work.
Nextcloud Calendar
- No native public booking-page flow (requires a third-party plugin)
- Video conferencing integration is limited compared to Calendly
- Mobile app experience is less polished than hosted alternatives
Bottom line
Choose Nextcloud Calendar if you want the lower-effort setup; choose Cal.com for the larger community and ecosystem. Cal.com has seen more recent development. Open each guide below for deploy steps and the full feature gap.
Cal.com
Scheduling infrastructure for everyone, the open-source Calendly alternative
Nextcloud Calendar
Full-featured CalDAV calendar server built into Nextcloud with sharing and scheduling