# Learn Underwater vs E

The clearest difference is in-app purchases: E at none against Learn Underwater's 1. Learn Underwater's advantage is update cadence (every 3 months vs every 32 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Learn Underwater sells 1 one-off in-app purchase. E asks for nothing beyond the download.

Learn Underwater ships an update every 3 months, E every 32 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | Learn Underwater | E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 32 months |
| Size | 21 MB | 213 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [STRIX inc](https://appshunter.io/developer/1144861140) |

## What reviewers say

### Learn Underwater

[App page](https://appshunter.io/ios/app/learn-underwater/id987875032)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ad | $0.99 | one-time |


### E

[App page](https://appshunter.io/ios/app/e-thology/id1457519660)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Learn Underwater free?

Learn Underwater is free to download, with in-app purchases available.

### Is E free?

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

### Do Learn Underwater or E have ads?

Neither Learn Underwater nor E shows ads.

### Which is updated more often, Learn Underwater or E?

Learn Underwater ships an update every 3 months, and E every 32 months. Most recently, Learn Underwater was updated on October 26, 2026 and E on October 26, 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.*