# Ultradian vs Daysy

The clearest difference is rating: Daysy at 5.0 against Ultradian's 3.3. Daysy also leads on update cadence (every 3 weeks vs every 5 months) and device support (3 vs 1). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Daysy holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Ultradian ships an update every 5 months, Daysy every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Ultradian | Daysy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (4 ratings)](https://appshunter.io/ios/app/ultradian/id1482130799/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/daysy/id6473222359/reviews)** |
| Number of ratings | 4 | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 7 MB | 54 MB |
| Requires iOS | 17.5 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Katherine Gratale](https://appshunter.io/developer/1482130798) | [Alexander Eischeid](https://appshunter.io/developer/1718654094) |

## What reviewers say

### Ultradian

[App page](https://appshunter.io/ios/app/ultradian/id1482130799)

Leverage your natural energy cycles for optimal task management and rest. This app analyzes biometric data to predict your ultradian rhythms, helping you schedule demanding activities during peak energy and breaks when needed.

**Highlights:** Analyze biometric data, Predict ultradian rhythms, Schedule peak task times, Schedule rest breaks, Connects to Apple Health

**Features:** macOS Compatibility

**In-app purchases:** none


### Daysy

[App page](https://appshunter.io/ios/app/daysy/id6473222359)

This app digitizes communication aids like PECS sheets and schedules. It offers a simple, quick setup for individuals and their care teams, facilitating first-then steps and basic communication. It aims to be a digital alternative to traditional PECS binders.

**Highlights:** Digitizes PECS sheets and binders, Facilitates schedules, Supports first-then steps, Enables basic communication, Simple and quick setup, Designed for individuals and care teams

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ultradian free?

Ultradian is free to download, with no in-app purchases.

### Is Daysy free?

Daysy is free to download, with no in-app purchases.

### Which has better reviews, Ultradian or Daysy?

Daysy is rated higher. Ultradian averages 3.3 out of 5 from 4 ratings, while Daysy averages 5.0 from 4 ratings.

### Do Ultradian or Daysy have ads?

Neither Ultradian nor Daysy shows ads.

### Which is updated more often, Ultradian or Daysy?

Ultradian ships an update every 5 months, and Daysy every 3 weeks. Most recently, Ultradian was updated on November 3, 2026 and Daysy on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*