Radicale vs Rallly
| Tagline | Lightweight CalDAV and CardDAV server with minimal configuration | Self-hosted scheduling polls to find the best time for a group to meet |
| Category | Scheduling & Booking | Scheduling & Booking |
| Replaces | Calendly, Acuity Scheduling | Calendly |
| GitHub stars | 4.8k | 5.1k |
| Language | Python | TypeScript |
| License | GPL-3.0 | AGPL-3.0 |
| Self-host difficulty | 2/5 Easy | 3/5 Moderate |
| Deploy options | Docker Manual | One-Click Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | today | today |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Radicale
- No web-based calendar UI; clients must use a CalDAV-compatible app (Thunderbird, Apple Calendar, etc.)
- Not a booking/scheduling tool; no public booking pages or availability sharing like Calendly
- Scaling beyond a handful of users is not a design goal
- Lacks push notifications; relies on client polling
Rallly
- Focused on group availability polling rather than one-on-one booking pages, so it does not replace Calendly's personal booking links.
- No direct calendar-availability checking or two-way calendar sync to auto-block busy times.
- No built-in payment collection or paid-appointment support.
- Requires PostgreSQL and SMTP configuration to self-host; not a single-binary deploy.
Bottom line
Choose Radicale if you want the lower-effort setup; choose Rallly for the larger community and ecosystem. Open each guide below for deploy steps and the full feature gap.