CalDavZAP
What CalDavZAP is
CalDavZAP is a free, open-source web client for calendars stored on CalDAV servers. It is a self-hosted application built with JavaScript and jQuery, and standard setup needs no special server software beyond a CalDAV server. The client detects read-only and read/write calendar collections asynchronously, including delegated and subscribed calendars, and synchronizes in the background. Users can edit VEVENT, VTODO, VALARM, and VTIMEZONE items, with full IANA time-zone support. It handles RFC-compliant vCalendar 2.0 files and corrects many common errors in invalid vCalendars. Shared calendars are supported, while scheduling links, mobile apps, and video meeting support are not. Special setups can use a server-based XML configuration generator with HTTP and LDAP authentication plugins. Supported browsers include Safari, Mobile Safari, Webkit, iCab, Firefox, Opera 15+, and Chrome; Internet Explorer is unsupported. The latest stable release listed is version 0.13.1 from 2015-09-22.
Who it suits
CalDavZAP suits people who want a self-hosted browser client for CalDAV calendars and shared collections. It is relevant to administrators using the listed compatible servers and browsers.
What it does well
- Free open-source CalDAV web client
- Asynchronous background calendar synchronization
- Edits multiple standard calendar components
- Supports delegated and subscribed calendars
- Full IANA time-zone support
What to know first
- Internet Explorer is unsupported
- No mobile apps are listed
- Latest stable release dates to 2015
- No video meeting support
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| CalDavZAP | Open source; GNU Affero General Public License version 3.0 | Free |
As inf-it.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
CalDavZAP provides broad CalDAV calendar access in a self-hosted web client. Its older listed release and browser limitations matter when planning a deployment.
Facts from CalDavZAP's own pages
- Browser support
- The page lists Safari/Mobile Safari, Webkit, iCab, Firefox, Opera 15+ and Chrome as supported HTML5 browsers, and says Internet Explorer is unsupported. · inf-it.com, 11 Oct 2026
- Calendar access
- It detects read only and read/write calendar collections asynchronously and supports delegated and subscribed calendars. · inf-it.com, 11 Oct 2026
- Calendar formats
- It supports RFC compliant vCalendar 2.0 and automatically corrects most common errors in invalid vCalendars. · inf-it.com, 11 Oct 2026
- Calendar sync
- two_way · inf-it.com, 23 Sept 2026
- Configuration
- A server based XML configuration generator for special setups includes HTTP and LDAP authentication plugins. · inf-it.com, 11 Oct 2026
- Editable items
- Read/write support covers VEVENT, VTODO, VALARM and VTIMEZONE components. · inf-it.com, 11 Oct 2026
- Free plan
- Yes · inf-it.com, 23 Sept 2026
- Implementation
- It is a 100% JavaScript and jQuery web client that needs no special server software for standard setup beyond a CalDAV server. · inf-it.com, 11 Oct 2026
- Integration
- InfCloud is described as an integrated version of CalDavZAP and CardDavMATE, the maker's CardDAV web client. · inf-it.com, 11 Oct 2026
- Mobile apps
- none · inf-it.com, 23 Sept 2026
- Purpose
- CalDavZAP is an open source CalDAV web client implementation. · inf-it.com, 11 Oct 2026
- Release
- The page identifies version 0.13.1, dated 2015-09-22, as the latest stable release and links to its source code download. · inf-it.com, 11 Oct 2026
- Scheduling links
- No · inf-it.com, 23 Sept 2026
- Server compatibility
- The page lists DAViCal, OS X server, Cyrus IMAP CalDAV (beta), SabreDAV, Baïkal, Radicale 0.8+, openCRX and Oracle Communications Calendar Server as tested servers. · inf-it.com, 11 Oct 2026
- Shared calendars
- Yes · inf-it.com, 23 Sept 2026
- Support
- The maker invites feedback and support requests by email in English, Slovak, Czech or Hungarian. · inf-it.com, 11 Oct 2026
- Synchronization
- It supports asynchronous background synchronization. · inf-it.com, 11 Oct 2026
- Time zones
- It supports full IANA time zones. · inf-it.com, 11 Oct 2026
- Video meeting support
- No · inf-it.com, 23 Sept 2026
Where CalDavZAP stands on Freedom251
- Calendar apps#128 of 194