CalDavZAP review
A browser-based CalDAV client for people who want direct control over calendar data.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
CalDavZAP is an open-source, JavaScript-based web client for accessing and managing calendars held on a CalDAV server. It suits individuals and small organizations who already have a compatible calendar service and want a browser interface for it. The client can detect read-only and read/write calendar collections, and it supports event and task management, alarms, recurring events, and time zones. Its scope is centered on the CalDAV ecosystem rather than serving as a standalone calendar service.
The feature set addresses everyday calendar work as well as shared-calendar cases: users can move and create events with drag and drop, search calendars, and work with delegated or subscribed calendars. Asynchronous background synchronization and two-way calendar sync support keeping the browser client aligned with the server. Time-range filtering is available when the server supports it. Integrations include DAViCal, OS X Server, Cyrus IMAP CalDAV, SabreDAV, Baïkal, Radicale, openCRX, and Oracle Communications Calendar Server, making compatibility with an existing server the key ecosystem consideration.
CalDavZAP is free and released under the GNU Affero General Public License version 3.0, with no paid tiers described. It runs on the web and requires a CalDAV server; a standard setup does not require special server software beyond that service. Email is the listed support channel. The product is not a fit for people who need mobile apps, scheduling links, or video meeting support as part of their calendar workflow. The official product page lists version 0.13.1, dated 2015-09-22, as its latest stable release, so buyers weighing ongoing development should consider that signal. Choose CalDavZAP for a browser-based interface to a compatible CalDAV setup, not as a broad replacement for consumer calendar suites.
Questions about CalDavZAP
What does CalDavZAP run on? Web. It runs in the cloud.
What does CalDavZAP integrate with? 8 integrations, including DAViCal, OS X Server, Cyrus IMAP CalDAV, SabreDAV and Baïkal.
Who is CalDavZAP built for? Solo users and small businesses (our editorial estimate).
CalDavZAP pros and cons
- Where it wins
- Reads and edits events, tasks, alarms, and recurring events
- Supports delegated and subscribed calendars with background sync
- Integrates with servers including DAViCal, SabreDAV, and Radicale
- Where it doesn't
- Runs in a browser only, with no mobile apps
- Does not provide scheduling links or video meeting support
- Requires a CalDAV server and is a focused client rather than a general calendar service
CalDavZAP fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update