Why we built
Calzine.
Modern life is fragmented across too many platforms. But the inbox remains the common entry point. Calzine exists to turn that chaos into one trustworthy calendar.
“Your calendar should reflect your actual week — not just the events you remembered to manually enter.”
Every week, millions of people receive event confirmations, booking notices, and meeting invites across dozens of platforms. Some make it into the calendar. Most don't. The result is a schedule that can't be trusted.
The problem isn't the calendar app. Google Calendar is excellent. The problem is the gap between where events are announced — scattered across email, ticketing platforms, scheduling tools, and booking systems — and where they need to live: on your calendar.
Calzine was built to close that gap. Not with another app to check, not with another tab to open, but with an intelligence layer that reads the emails already arriving in your inbox and turns them into organized, accurate calendar events automatically.
Building toward
universal calendar intelligence.
Gmail + Google Calendar core
Connect Gmail via OAuth, detect event emails, extract structured data with AI, deduplicate, sync to Google Calendar, review queue for uncertain items, basic routing rules. The end-to-end flow, working reliably.
Broader integrations and smarter handling
Direct Webex and Teams APIs, improved cancellation and reschedule handling, multi-calendar routing, confidence scoring improvements, more travel platform support, an analytics dashboard for power users.
Expanded platform support and calendar intelligence
Outlook and Exchange support, Apple Calendar sync, team-wide integration policies, event summaries, travel time blocking, prep time suggestions, and broader calendar intelligence. The vision: your calendar knows your week before you do.
“The inbox is the last universal surface. Calzine is the bridge between what arrives there and what should be on your calendar.”
The fragmentation of event data isn't going away. New platforms, new scheduling tools, and new confirmation systems will keep multiplying. The problem compounds with every new app that sends you a booking confirmation.
Calzine's thesis is that the inbox — despite everything — remains the single common channel. Every platform sends confirmation emails. If you can read those intelligently, you can aggregate events from anywhere, regardless of whether the platform builds a calendar integration.
That's the durable advantage. APIs where they exist. AI where they don't. One calendar that always reflects your real week.
Join us in building
calendar clarity.
Get early access and help shape what Calzine becomes.