Cal.com vs Zcal
| Tagline | Scheduling infrastructure for everyone, the open-source Calendly alternative | Beautiful open-source scheduling page and availability management tool |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Calendly, Acuity Scheduling |
| GitHub stars | 49k | 1.2k |
| Language | TypeScript | TypeScript |
| License | AGPL-3.0 | MIT |
| Self-host difficulty | 3/5 Moderate | 2/5 Simple |
| Deploy options | One-Click Docker Docker Compose Manual | Docker Compose Manual |
| Managed hosting | ||
| Last updated | 3 days ago | 6 months 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.
Zcal
- Smaller calendar and integration ecosystem than Cal.com or Calendly.
- The self-hosted path has a smaller community and less operational documentation than Cal.com.
- Advanced enterprise administration and routing controls are less extensive than larger scheduling platforms.
Bottom line
Choose Zcal 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