# DataWater vs UMMI by Entropy

The clearest difference is update cadence: DataWater at every 3 months against UMMI by Entropy's every 21 months. UMMI by Entropy's advantage is iOS requirement (10.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

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

DataWater ships an update every 3 months, UMMI by Entropy every 21 months. The most recent releases landed on September 27, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | DataWater | UMMI by Entropy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 21 months |
| Size | 28 MB | 20 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Data Monitoring](https://appshunter.io/developer/1361669407) | [ENTROPY CARE SYSTEMS SL](https://appshunter.io/developer/1466198299) |

## What reviewers say

### DataWater

[App page](https://appshunter.io/ios/app/datawater/id1361669408)

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

**In-app purchases:** none


### UMMI by Entropy

[App page](https://appshunter.io/ios/app/ummi-by-entropy/id1466198300)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DataWater free?

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

### Is UMMI by Entropy free?

UMMI by Entropy is free to download, with no in-app purchases.

### Do DataWater or UMMI by Entropy have ads?

Neither DataWater nor UMMI by Entropy shows ads.

### Which is updated more often, DataWater or UMMI by Entropy?

DataWater ships an update every 3 months, and UMMI by Entropy every 21 months. Most recently, DataWater was updated on September 27, 2026 and UMMI by Entropy on October 18, 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.*