# Cyclebraid: RRULE Lab — Recurrence and time zones

> Recurrence and time zones (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/cyclebraid-rrule-lab/id6793302443 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Developer Tools, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 73 MB
- Released: 2026-08-03
- Data updated: 2026-08-13
- User reviews in markdown: https://appshunter.io/ios/app/cyclebraid-rrule-lab/id6793302443/reviews.md

## What is Cyclebraid?

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.


## Version history (last 1 release)

### 1.0 — 2026-08-04

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*