Cal.diy vs Tymeslot
| Tagline | Open-source online appointment scheduling built on Cal.com | Elixir/Phoenix meeting scheduling platform you can self-host |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Calendly |
| GitHub stars | 47k | 159 |
| Language | Nodejs | Elixir |
| License | MIT | Elastic-2.0 |
| Self-host difficulty | 3/5 Moderate | 3/5 Moderate |
| Deploy options | Docker Docker Compose Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | 7 days ago | 4 days 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.diy
- Self-hosted setup requires configuring PostgreSQL, email/SMTP, and OAuth providers
- Enterprise features (SAML SSO, workflows at scale, analytics) are cloud-only or require an enterprise license
- Payment collection integrations need additional third-party setup
- Admin UI for multi-tenant management is less polished than Calendly's hosted offering
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.diy for the larger community and ecosystem. Tymeslot has seen more recent development. Open each guide below for deploy steps and the full feature gap.