# 计算器Max vs R90 Sleepytime

The clearest difference is price: 计算器Max at Free against R90 Sleepytime's $0.99. 计算器Max also leads on iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

计算器Max is free to download; R90 Sleepytime costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 计算器Max | R90 Sleepytime |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Free |
| Size | 26 MB | 72 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jun Wu](https://appshunter.io/developer/1329325100) | [志加 徐](https://appshunter.io/developer/1868269300) |

## What reviewers say

### 计算器Max

[App page](https://appshunter.io/ios/app/max/id6744909349)

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

**In-app purchases:** none


### R90 Sleepytime

[App page](https://appshunter.io/ios/app/r90-sleepytime/id6757743725)

This app calculates optimal sleep and wake times based on scientific sleep cycles. It also offers guided meditations and soothing sounds to help you relax and fall asleep faster.

**Highlights:** Sleep cycle calculation, Optimal wake time suggestions, Soothing sleep music, Guided meditation, Anxiety relief, Relaxation techniques

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

**In-app purchases:** none


## Frequently asked questions

### Is 计算器Max free?

计算器Max is free to download, with no in-app purchases.

### Is R90 Sleepytime free?

R90 Sleepytime costs $0.99, with no in-app purchases.

### Do 计算器Max or R90 Sleepytime have ads?

Neither 计算器Max nor R90 Sleepytime shows ads.

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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.*