# R90 sleep assistant vs StepDeck

The clearest difference is in-app purchases: StepDeck at none against R90 sleep assistant's 1. StepDeck also leads on update cadence (every 5 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. R90 sleep assistant sells 1 one-off in-app purchase. StepDeck asks for nothing beyond the download.

R90 sleep assistant ships an update every 4 months, StepDeck every 5 days. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | R90 sleep assistant | StepDeck |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 692 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [阳 孙](https://appshunter.io/developer/1518808403) | [Marcel Brueck](https://appshunter.io/developer/1891356655) |

## What reviewers say

### R90 sleep assistant

[App page](https://appshunter.io/ios/app/r90-sleep-assistant/id1527861860)

This app helps you manage your sleep cycle using the scientifically-backed R90 method. It calculates your optimal sleep schedule based on natural biological rhythms to improve sleep quality by focusing on completing 90-minute cycles.

**Highlights:** Calculate optimal sleep schedule, Track completed sleep cycles, Record sleep patterns automatically, Smart bedtime and wake time calculations, Weekly cycle goal tracking, Integrates with HealthKit

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fully unlocked | $1.99 | one-time |


### StepDeck

[App page](https://appshunter.io/ios/app/stepdeck/id6761767188)

**In-app purchases:** none


## Frequently asked questions

### Is R90 sleep assistant free?

R90 sleep assistant is free to download, with in-app purchases available.

### Is StepDeck free?

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

### Do R90 sleep assistant or StepDeck have ads?

Neither R90 sleep assistant nor StepDeck shows ads.

### Which is updated more often, R90 sleep assistant or StepDeck?

R90 sleep assistant ships an update every 4 months, and StepDeck every 5 days. Most recently, R90 sleep assistant was updated on October 26, 2026 and StepDeck on October 13, 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.*