Cal.com vs Tymeslot
| Tagline | Scheduling infrastructure for everyone, the open-source Calendly alternative | Elixir/Phoenix meeting scheduling platform you can self-host |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Calendly |
| GitHub stars | 48k | 194 |
| Language | TypeScript | Elixir |
| License | AGPL-3.0 | Elastic-2.0 |
| Self-host difficulty | 3/5 Moderate | 3/5 Moderate |
| Deploy options | One-Click Docker Docker Compose Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | yesterday | yesterday |
| 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.
Tymeslot
- Younger and smaller project than Cal.com, with a more limited integration and app ecosystem.
- Licensed under the Elastic License 2.0, which is source-available rather than OSI-approved open source and restricts offering it as a competing managed service.
- Fewer calendar providers and payment options than mature commercial tools.
- Self-hosting requires an Elixir/OTP and PostgreSQL setup, which is less familiar to many ops teams.
Bottom line
Both are a similar lift to self-host; choose Cal.com for the larger community and ecosystem. Open each guide below for deploy steps and the full feature gap.
Cal.com
Scheduling infrastructure for everyone, the open-source Calendly alternative