Every calendar.
One view.
Connect Google and Microsoft. Kaiju automatically blocks time across all your calendars so nothing double-books — even when you're juggling ten of them.
Six calendars. None of them talk.
Work, personal, two clients, your partner's shared calendar, and the side project. Each one a silo. Each one a chance to double-book yourself.
Before Kaiju
● 3 conflicts this weekSix tabs open. Constant context-switching. The conflict you didn't see until someone DM'd you.
With Kaiju
● All clearOne unified week. Color-coded by source. Conflicts impossible — Kaiju mirrors Busy across every calendar.
Built for people who live across multiple calendars.
Agency owners
Managing client accounts, internal ops, and personal life across 4+ calendars.
Freelancers
Work calendar, personal calendar, and per-client accounts all in one view.
Founders
Side project, main venture, and personal — finally in sync.
Remote teams
Multiple work accounts across time zones, automatically coordinated.
Three steps. Then never again.
Connect your calendars
Sign in with Google or Microsoft. Add as many accounts as you like — work, personal, side projects, family. Kaiju reads them all.
See everything in one view
A unified week view, color-coded by source. Search across every calendar at once. Filter to a single workspace when you need to focus.
Time blocks itself
Book a meeting on one calendar — Kaiju instantly mirrors a Busy placeholder on every other. No more "wait, I have a conflict."
The thing other tools don't do.
| Kaiju | Google Calendar | Fantastical | Reclaim | |
|---|---|---|---|---|
| Multiple Google + Microsoft accounts | ● | partial | ● | ● |
| Auto-mirror Busy across calendars | ● | ○ | ○ | partial |
| Delete events from any connected calendar | ● | ● | ● | ○ |
| Out of Office from one place, synced everywhere | ● | ○ | ○ | ○ |
| Privacy mirroring (titles hidden) | ● | ○ | ○ | partial |
| No AI re-arranging your schedule | ● | ● | ● | ○ |
We mirror Busy. Not your business.
When Kaiju copies an event from one calendar to another as a placeholder, only "Busy" travels. Titles, locations, attendees, and notes stay where you wrote them.
Busy-only by default
The placeholder Kaiju writes to other calendars contains no title, no attendees, no location. Just the time block.
Encrypted in transit and at rest
All data encrypted in transit and at rest. OAuth tokens are never stored in plain text.
Revoke anytime
Disconnect any account in one click. Kaiju removes its mirrored placeholders and forgets your tokens within 24 hours.
I run a marketing agency. At any given time I'm managing four calendars — work, two client accounts, and personal. Every few weeks I'd accidentally double-book myself because a meeting on one calendar wasn't visible on the others.
I looked for something that would just handle it. Automatically block time everywhere when I booked something anywhere. Nothing did.
So I built Kaiju Calendar. It's the tool I wanted to exist.
Built on trust.
Your calendar is personal. We treat it that way.
Encrypted at rest
All OAuth tokens are encrypted with AES-256-GCM before they touch our database. Your calendar credentials are never stored in plain text.
Your events stay private
Busy placeholders on other calendars just say 'Busy' — never the actual event title. Your work calendar never sees your personal appointment details.
We never sell your data
We don't train AI on your calendar data. We don't sell it. We don't share it with third parties. Your schedule is yours.
One plan. Everything in.
Per user. Billed monthly. Annual saves 20%.
- Unlimited Google & Microsoft accounts
- Automatic Busy mirroring across calendars
- 14-day free trial — no card required
- Cancel anytime, export everything
Try it free.
14 days. No credit card. Cancel in one click. Connect your first calendar in under sixty seconds.
Start free trial