# Ultradia — Ultradian rhythm tracker

> Ultradian rhythm tracker (iPhone/iPad app by Manicgrin Media Ltd.)

- Source: https://appshunter.io/ios/app/ultradia/id6757751876 (this page in markdown: same URL + `.md`)
- Developer: [Manicgrin Media Ltd](https://appshunter.io/developer/906528891)
- Category: Health & Fitness, Reference
- Price: $1.99
- Age rating: 17+
- Requires: iOS 26.0 · 10 MB
- Languages: American English
- Released: 2026-01-15
- Data updated: 2026-08-01
- User reviews in markdown: https://appshunter.io/ios/app/ultradia/id6757751876/reviews.md

## What is Ultradia?

Ultradia – Your energy rhythm tracker

Discover your natural energy patterns and learn when you're at your best.

Ultradia uses your Apple Watch data to detect your ultradian rhythms – the 90-120 minute cycles of high and low energy that occur throughout the day. By understanding your personal rhythm, you can schedule demanding tasks when your energy naturally peaks and take breaks when it dips.

Track any activity

Log workouts, focused work sessions, creative projects, or housework. Ultradia tracks how you feel during different activities and learns which times of day work best for each type.

Features

- Real-time energy state monitoring
- Automatic HealthKit workout import
- Activity logging for exercise, work, creative tasks, and housework
- Energy window predictions
- Personalised correlation insights
- Sleep data integration
- Push notifications for optimal windows
- Companion Apple Watch app and widget

Privacy first

All data stays on your device. Ultradia uses Apple HealthKit to read your heart rate variability and activity data – nothing is uploaded or shared.

The science

Ultradian rhythms (specifically the Basic Rest-Activity Cycle) have been studied since the 1950s. Research shows these ~90-minute cycles affect alertness, cognitive performance, and physical readiness. By tracking the physiological markers of these cycles, Ultradia helps you work with your biology rather than against it.

Requirements

- Apple Watch required for rhythm detection
- Best results after 3+ days of continuous wear

Please note:

Ultradia is a general wellness tool designed to help you understand your energy patterns. Predictions are estimates based on your data and may not always match how you feel. This app is not a medical device and is not intended to diagnose, treat, or prevent any health condition. Always listen to your body.


## Version history (last 5 releases)

### 1.5.1 — 2026-04-22

Fixed issue with notification toggles misbehaving.

### 1.5 — 2026-04-14

What's new

- You can now opt in to notifications before recovery phases, not just peak energy windows. Find the new toggle in Settings.
- The algorithm now factors in your step count and active energy alongside heart rate and HRV, giving more accurate rhythm predictions.
- Widgets now update at each phase transition rather than on a fixed timer, so they always reflect your current energy state.
- Activities logged on your Apple Watch are now queued and synced when your phone reconnects, so nothing gets lost.
- Added VoiceOver support across the app, including energy charts, sleep stage breakdowns, activity feedback buttons, and upcoming window cards.

Bug fixes

- Fixed an issue where the error alert could get stuck and not dismiss properly.
- Notification lead time now saves correctly between app launches.
- Scheduling peak alerts no longer accidentally clears rest alerts (and vice versa).
- The rhythm analyser no longer gets stuck on "Analysing" when there isn't enough data yet.
- Fixed stale cycle length data persisting after periods with no detected cycles.
- Confidence scores are now correctly clamped to 0–100%.
- Fixed a potential division-by-zero in workout insights when no data exists outside optimal windows.
- The app no longer crashes on a Core Data load failure — it attempts recovery instead.
- Watch complication for Graphic Bezel now renders correctly.
- Fixed a data consistency issue where the Watch could receive mismatched window identifiers.
- Background task handling is now more robust, with safer type casting and proper expiration signalling.
- Resolved several thread safety issues in phone-to-watch communication.
- Removed stale sleep and prediction data from the UI when no recent sleep session is found.
- Fixed potential crashes from force-unwrapped calendar operations in bedtime suggestions.

### 1.4 — 2026-03-02

Added optional quiet time notification suppression, so it doesn't send alerts through the night when you're asleep. Fixed issue with app pulling in duplicate activity sessions. Fixed issue with average sleep times getting confused by going to bed after midnight. New Watch icon.

### 1.2 — 2026-01-29

New onboarding screens, energy history (on Rhythms page), data export (PDF and CSV — in settings). Improved background updates. Bug fixes and UI tweaks.

### 1.1 — 2026-01-22

Companion Apple Watch app and widget. Improved cycle detection. Improved sleep recommendations. Bug fixes.

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All apps by Manicgrin Media Ltd: https://appshunter.io/developer/906528891

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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 2026-08-01.*