# Ultradian vs TantalusPath

The clearest difference is rating: TantalusPath at 5.0 against Ultradian's 3.3. TantalusPath also leads on update cadence (every 3 months vs every 5 months). Ultradian's advantage is in-app purchases (none vs 2). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. TantalusPath sells 2 in-app purchases, starting at $3.99 per month. Ultradian asks for nothing beyond the download.

TantalusPath holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Ultradian ships an update every 5 months, TantalusPath every 3 months. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Ultradian | TantalusPath |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (4 ratings)](https://appshunter.io/ios/app/ultradian/id1482130799/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tantaluspath/id6504832898/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 102 MB |
| Requires iOS | 17.5 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Katherine Gratale](https://appshunter.io/developer/1482130798) | [Serendipity Systems LLC](https://appshunter.io/developer/1754009660) |

## 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


### TantalusPath

[App page](https://appshunter.io/ios/app/tantaluspath/id6504832898)

This app uses random positive reinforcement to help you achieve your goals and align with your values. It guides you through a cycle of anticipating, earning, and enjoying rewards, with customizable options and progress-based unlocks.

**Highlights:** Random positive reinforcement, Goal and value alignment, Reward anticipation and earning, Customizable reward pools, Unlockable progress and story, Tips on intermittent rewards

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tantalus Subscription | $3.99 | per month |
| Gem bundle | $59.99 | one-time |


## Frequently asked questions

### Is Ultradian free?

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

### Is TantalusPath free?

TantalusPath is free to download, with in-app purchases available.

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

TantalusPath is rated higher. Ultradian averages 3.3 out of 5 from 4 ratings, while TantalusPath averages 5.0 from 3 ratings.

### Do Ultradian or TantalusPath have ads?

Neither Ultradian nor TantalusPath shows ads.

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

Ultradian ships an update every 5 months, and TantalusPath every 3 months. Most recently, Ultradian was updated on October 15, 2026 and TantalusPath on October 10, 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.*