# LumenCycle — 100% Offline Cycle Tracking

> Offline period and fertility tracker with on-device predictions and privacy focus. (iPhone/iPad app by Robert Diehl.)

- Source: https://appshunter.io/ios/app/lumencycle/id6801582173 (this page in markdown: same URL + `.md`)
- Developer: [Robert Diehl](https://appshunter.io/developer/6800495451)
- Category: Lifestyle, Medical
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.1 · 30 MB
- Languages: American English
- Released: 2026-08-21
- Data updated: 2026-10-31
- Monetization: free with in-app purchases

## What is LumenCycle?

Lumen Cycle is a privacy-first period and fertility tracker that works entirely offline. No accounts. No cloud sync. No analytics. Your logs stay on this device unless you choose to export them.

SEE YOUR CYCLE CLEARLY
A dark, calm calendar highlights period days, fertile windows, and estimated ovulation so you can understand your cycle at a glance. Tap any day to log, or jump months quickly when you need history.

LOG WHAT MATTERS
Record flow intensity, basal body temperature (°F or °C), cervical fluid, intimacy, and grouped symptoms — physical, mood & sleep, and digestive/other. Notes stay private on your phone.

ON-DEVICE PREDICTIONS
Lumen Cycle estimates your next period, fertile window, and ovulation using your past period starts (modified Ogino-Knaus calendar method). Predictions are estimates for personal awareness — not birth control and not medical advice.

HISTORY & TRENDS
Charts show cycle length, period length, basal temperature trends, and which symptoms you logged most this month.

FACE ID PROTECTION
Require Face ID (or device passcode) when you open the app and when you return from the background, so your cycle data isn’t visible at a glance.

EXPORT WHEN YOU NEED IT
Premium unlocks PDF summaries for doctor visits (last 3 months), plus JSON and CSV exports to the Files app.

FREE TO START
Your first month of logging is free. When you’re ready, unlock everything forever for $2.99 — one payment, no subscriptions, no add-ons.

Privacy isn’t a setting in Lumen Cycle. It’s the product.

## Key features

- Offline cycle tracking
- Period and fertility window predictions
- Symptom logging
- On-device data storage
- Face ID protection
- Cycle history and trends
- PDF and CSV export (premium)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| LumenCycle Life Time Unlock | $2.99 | one-time |


## Is LumenCycle safe?

Not enough ratings yet to assess LumenCycle.

## Is LumenCycle legit?

LumenCycle has limited verification signals. The AppsHunter Legitimacy Score for LumenCycle is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Frequently asked questions about LumenCycle

### Does LumenCycle have ads?

No, LumenCycle does not contain advertisements. The app is designed to be ad-free, focusing on a clean user experience.

### How much does LumenCycle cost?

LumenCycle is free to start, offering your first month of logging for free. To unlock all features permanently, there is a one-time payment of $2.99.

### What devices does LumenCycle support?

LumenCycle is available for iPhone, iPad, and iPod. It is designed to work across these Apple devices.

### How often is LumenCycle updated?

LumenCycle was last updated on August 21, 2026, with version 1.1.3. Future updates will likely follow to improve functionality and address any issues.

### Is LumenCycle safe for all ages?

LumenCycle has an age rating of 4+, making it suitable for a wide range of users. The app's focus on privacy ensures user data is handled with care.

### What makes LumenCycle's privacy features stand out?

LumenCycle is a privacy-first application. It operates entirely offline with no accounts, cloud sync, or analytics, ensuring your personal logs remain on your device unless you choose to export them.

### Can I export my data from LumenCycle?

Yes, you can export your data. Premium users can unlock PDF summaries for doctor visits (last 3 months) and export data in JSON and CSV formats to the Files app.

### What kind of predictions does LumenCycle offer?

LumenCycle estimates your next period, fertile window, and ovulation based on your past period starts using the modified Ogino-Knaus calendar method. These are for personal awareness and not intended as birth control or medical advice.

## Version history (last 1 release)

### 1.1.3 — 2026-08-21

No release notes.

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## More apps by Robert Diehl

- [PetKyn Health](https://appshunter.io/ios/app/petkyn-health/id6800495449)

All apps by Robert Diehl: https://appshunter.io/developer/6800495451

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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 2026-10-31.*