# Dehydrate vs Sleep Cycle Simple Calculator

The clearest difference is update cadence: Sleep Cycle Simple Calculator at every 2 days against Dehydrate's every 16 months. Sleep Cycle Simple Calculator also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.2). On price, 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.

Dehydrate ships an update every 16 months, Sleep Cycle Simple Calculator every 2 days. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Dehydrate | Sleep Cycle Simple Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 days** |
| Size | 4 MB | 31 MB |
| Requires iOS | 18.2 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nico Liu](https://appshunter.io/developer/1080122034) | [Marius Kuzminskas](https://appshunter.io/developer/1859767355) |

## What reviewers say

### Dehydrate

[App page](https://appshunter.io/ios/app/dehydrate/id6743676923)

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

**In-app purchases:** none


### Sleep Cycle Simple Calculator

[App page](https://appshunter.io/ios/app/sleep-cycle-simple-calculator/id6756280217)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dehydrate free?

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

### Is Sleep Cycle Simple Calculator free?

Sleep Cycle Simple Calculator is free to download, with no in-app purchases.

### Do Dehydrate or Sleep Cycle Simple Calculator have ads?

Neither Dehydrate nor Sleep Cycle Simple Calculator shows ads.

### Which is updated more often, Dehydrate or Sleep Cycle Simple Calculator?

Dehydrate ships an update every 16 months, and Sleep Cycle Simple Calculator every 2 days. Most recently, Dehydrate was updated on October 9, 2026 and Sleep Cycle Simple Calculator on October 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*