OpenSlots vs QloApps
| Tagline | Minimalist appointment slot booking system with email confirmation | Open-source hotel reservation and channel management system |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Acuity Scheduling, Calendly |
| GitHub stars | 400 | 14k |
| Language | PHP | PHP |
| License | MIT | OSL-3.0 |
| Self-host difficulty | 2/5 Easy | 4/5 Involved |
| Deploy options | Manual Docker | Docker Manual |
| Managed hosting | ||
| Last updated | 7 months ago | 15 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.
OpenSlots
- No recurring appointment or subscription booking support
- Email notifications only — no SMS or push
- No calendar sync (Google/Apple/Outlook)
QloApps
- Scope is hotel-specific; not a general-purpose appointment scheduler
- Channel manager integrations (OTA sync) are limited compared to commercial PMS solutions
- Mobile app for guests/staff is absent out of the box
- PrestaShop heritage makes theming and customisation non-trivial
Bottom line
Choose OpenSlots if you want the lower-effort setup; choose QloApps for the larger community and ecosystem. QloApps has seen more recent development. Open each guide below for deploy steps and the full feature gap.