Agenda vs OpenSlots
| Tagline | Node.js job scheduling library with persistent MongoDB-backed queue | Minimalist appointment slot booking system with email confirmation |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly | Calendly, Acuity Scheduling |
| GitHub stars | 9.2k | 400 |
| Language | TypeScript | PHP |
| License | MIT | MIT |
| Self-host difficulty | 3/5 Moderate | 2/5 Easy |
| Deploy options | Manual Docker | Manual Docker |
| Managed hosting | ||
| Last updated | 6 months ago | 7 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.
Agenda
- Library only — no UI for managing or viewing scheduled jobs without additional tooling
- Requires MongoDB; not suitable for simple SQLite/Postgres-only stacks
- No native support for distributed locking at high scale
OpenSlots
- No recurring appointment or subscription booking support
- Email notifications only — no SMS or push
- No calendar sync (Google/Apple/Outlook)
Bottom line
Choose OpenSlots if you want the lower-effort setup; choose Agenda for the larger community and ecosystem. Agenda has seen more recent development. Open each guide below for deploy steps and the full feature gap.