Asta / Features
The unified calendar that actually protects your time.
Asta brings Google, Microsoft, and iCloud into one timeline — and adds the cross-provider busy-blocking that Notion Calendar and Cron can't do. Here's the full picture.
Google
Microsoft 365
iCloud
The differentiator
Cross-account shadow blocking
The one thing every other unified calendar leaves to you — automated.
- Accept a meeting on one account and Asta writes a private busy block onto your other calendars, across Google, Microsoft, and iCloud.
- Blocks are directional and rule-driven: protect personal from work, work from personal, or both — you decide per account.
- Move or cancel the original meeting and Asta updates or removes every mirrored block automatically. No stale holds, ever.
- Blocks carry zero detail — no title, attendees, or notes leak between accounts or providers.
One timeline
Every account, unified
A single, fast calendar instead of three browser tabs.
- All calendars from all connected accounts in one day, three-day, or week view, color-coded by source.
- Create, edit, move, and delete events on any account without leaving Asta.
- Multiple accounts per provider — two Google logins, a work Microsoft tenant, and iCloud all live side by side.
- Read-only calendars (shared team calendars, subscriptions) render cleanly without getting in your way.
Always current
Real-time two-way sync
Changes flow both directions in seconds.
- Asta subscribes to live updates from each provider and reconciles changes the moment they happen.
- Edits you make in Asta write straight back to the source calendar — it's your real calendar, not a copy.
- A resilient sync engine handles flaky provider APIs and recovers automatically, so blocks stay consistent.
Everywhere you work
Native on every platform
macOS, iOS, Android, Web — one engine behind all of them.
- A native macOS app that feels at home on the desktop.
- Native iOS and Android apps for managing your day on the move.
- A complete web app for everything else — nothing is web-only or mobile-only.
- Your accounts, rules, and shadow blocks are identical on every device, instantly.
Yours to control
Private and reversible
You stay in charge of your data and your blocks.
- Asta reads only the calendar data it needs to render events and place busy holds.
- Shadow blocks never expose the details of the meeting that triggered them.
- Disconnect any account at any time and Asta removes the blocks it created on it.
- Turn protection on or off per account whenever you want.
See it on your own calendars.
Join the free closed beta and lock in founder pricing.