Ultradian vs Daysy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ultradian
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.
- Analyze biometric data
- Predict ultradian rhythms
- Schedule peak task times
- Schedule rest breaks
- Connects to Apple Health
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Experience peak productivity and well-timed rest with Ultradian, the app designed to help you leverage your natural energy cycle. By securely connecting to Apple Health, Ultradian analyzes your biometric data to predict your daily ultradian rhythms—empowering you to plan tougher tasks when you’re at your peak and schedule breaks when you need them most.
Daysy
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.
- Digitizes PECS sheets and binders
- Facilitates schedules
- Supports first-then steps
- Enables basic communication
- Simple and quick setup
- Designed for individuals and care teams
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Daysy is a free app for iPhone and iPad that digitizes your PECS sheets and binders, facilitates schedules, first-then steps, as well as basic communication. Daysy's primary goal is a straight-forward, simple design and set up that is quick and easy for both individuals and their caregiving team! With high demand for AAC apps and digital PECS replacements, there is little to no comparable solution on the market. Try Daysy for free today!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Ultradian | Daysy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (4 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 | 4 |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | Katherine Gratale | Alexander Eischeid |
Customer experience
Ultradian
Daysy
In-app purchases
Ultradian
No in-app purchases
Daysy
No in-app purchases
