zerocal
Coming soonGoodFlow’s own iOS app · Coming to the App Store, November 2026
An iPhone calendar where one typed or spoken sentence becomes an event.
Visit site (opens in a new tab)
- 1 sentence→ 1 event
- 2 languagesdetected automatically
- 0data sent to a server
The problem
Calendar apps make you pick the date, time and repeat rule one field at a time, so busy people put off adding events.
What was built
- A natural-language event engine for Korean and English
- Voice input running through the same engine
- Live preview of what was understood and what overlaps
- Google, Outlook and iCloud calendars
- Home and Lock Screen widgets
- Free + Pro (yearly or lifetime) business model
Why it matters
A UX that reduces a complex form to one sentence, designed and shipped end to end. Everything runs on the device, so there are no server costs and no personal data to protect.
Stack
- iOS 17+
- WidgetKit
- EventKit
- On-device NLP