CalDAV is the open protocol behind Fastmail, iCloud, and various self-hosted calendar systems. Here's what scheduling tools support it well. Here's the practical setup.
Current state in Cal Clear
Cal Clear currently supports Google accounts (Workspace + Gmail). Microsoft 365 / Outlook support and CalDAV support (for iCloud, Fastmail, self-hosted) are on the 2026 roadmap. For pure-Google setups today, Cal Clear is a fit; for Outlook-first or iCloud-first users, it's roadmap.
Interim workaround: one-way sync
If you need to book clients on a Google calendar but also respect your Outlook or iCloud calendar, set up a one-way sync from the non-Google calendar into a dedicated Google calendar. Tools like CalendarBridge or OneCal handle this sync. Cal Clear then checks the synced Google calendar alongside your primary — not a perfect solution but works in most cases.
What to watch for
Sync latency, failed sync restarts after OAuth expirations, and edge cases around recurring events / meeting updates. The one-way sync approach works well for most individual users but breaks down for heavy team-scheduling contexts.
Part of the multi-calendar scheduling pillar guide.
Frequently Asked Questions
When will Cal Clear support native Outlook/iCloud?
Microsoft 365 OAuth and CalDAV are both on the 2026 roadmap. For users who need them today, the sync-to-Google workaround is the interim path.
Will Cal Clear eventually support Microsoft Teams calendars?
Teams calendars live in Exchange/M365, so native M365 support covers them. Yes, on the roadmap.
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