Purpose-Built
A deterministic iCalendar recurrence debugger for RRULE, RDATE, EXDATE, DST, floating time, time zones, exceptions, collision windows, and human-readable schedules.
One-time iPhone and iPad app
Cyclebraid
Recurrence and time zones
Core Features
- Parse VEVENT recurrence sets and VTIMEZONE data
- Expand RRULE with RDATE, EXDATE, and overrides
- Visualize DST gaps, folds, and floating-time behavior
- Compare schedules across cities and calendar engines
- Generate edge-case fixtures and readable explanations
Private by Design
No account, subscription, ads, tracking, third-party analytics, or developer-operated backend. Core features work offline, and your work stays on device unless you deliberately share or export it.
Use It Responsibly
Interoperability and test aid. Calendar servers and clients vary; verify critical schedules in every target system and jurisdiction.