Inside the app
A closer look.
About this app
Made for a clear purpose.
Cyclebraid: RRULE Lab is a focused, fully on-device app. A deterministic iCalendar recurrence debugger for RRULE, RDATE, EXDATE, DST, floating time, time zones, exceptions, collision windows, and human-readable schedules.
KEY 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 - Complete bundled sample and local comparison workflow - Local PDF report and Apple system share export - Original offline technical reference library
ONE-TIME AND PRIVATE - One paid download; no subscription or in-app purchase - No account, advertising, analytics, tracking, or developer-operated backend - Core features and bundled content work offline - Work remains on device unless you deliberately share or export it through an Apple system interface
Interoperability and test aid. Calendar servers and clients vary; verify critical schedules in every target system and jurisdiction.
