Overview
SabreDAV is the foundational PHP library and server for WebDAV, CalDAV, and CardDAV protocols. It powers projects like Baïkal and Nextcloud's DAV stack. Developers implement custom backends by extending its class hierarchy. It ships as a Composer library with example server scripts; deployment requires building a custom PHP application around it.
Where it falls short of Calendly
- A developer framework, not an end-user product; requires significant custom PHP development
- No admin UI, booking pages, or user-facing features out of the box
- Documentation assumes solid PHP and WebDAV protocol knowledge
- Not a drop-in replacement for any SaaS scheduling tool without substantial build effort
We list the gaps honestly so you can decide if the trade-off is worth owning your data.
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