# Sisu Training vs Sleep Optimizer

The clearest difference is iOS requirement: Sleep Optimizer at 13.0 against Sisu Training's 15.5. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sisu Training | Sleep Optimizer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 166 MB | 21 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kaisu Karttunen](https://appshunter.io/developer/1573623817) | [Livanda - Internetkliniken AB](https://appshunter.io/developer/1607972909) |

## What reviewers say

### Sisu Training

[App page](https://appshunter.io/ios/app/sisu-training/id1573623365)

**Features:** Apple Wallet, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Sleep Optimizer

[App page](https://appshunter.io/ios/app/sleep-optimizer/id1607972907)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sisu Training free?

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

### Is Sleep Optimizer free?

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

### Do Sisu Training or Sleep Optimizer have ads?

Neither Sisu Training nor Sleep Optimizer shows ads.

### Which is updated more often, Sisu Training or Sleep Optimizer?

Sisu Training ships an update every 2 months, and Sleep Optimizer every 2 months. Most recently, Sisu Training was updated on October 3, 2026 and Sleep Optimizer on October 6, 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.*