# Epsilon 3 Mobile vs DynamiqBook

The clearest difference is iOS requirement: Epsilon 3 Mobile at 11.0 against DynamiqBook's 14.0.0. On price, update cadence, 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.

Epsilon 3 Mobile ships an update every 4 weeks, DynamiqBook every 6 weeks. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Epsilon 3 Mobile | DynamiqBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 6 weeks |
| Size | 235 MB | 28 MB |
| Requires iOS | **11.0** | 14.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Grupo Castilla](https://appshunter.io/developer/1338706271) | [Golubo Software](https://appshunter.io/developer/1772068091) |

## What reviewers say

### Epsilon 3 Mobile

[App page](https://appshunter.io/ios/app/epsilon-3-mobile/id1338706272)

**Features:** Vision Pro support

**In-app purchases:** none


### DynamiqBook

[App page](https://appshunter.io/ios/app/dynamiqbook/id6747116901)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Epsilon 3 Mobile free?

Epsilon 3 Mobile is free to download, with no in-app purchases.

### Is DynamiqBook free?

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

### Do Epsilon 3 Mobile or DynamiqBook have ads?

Neither Epsilon 3 Mobile nor DynamiqBook shows ads.

### Which is updated more often, Epsilon 3 Mobile or DynamiqBook?

Epsilon 3 Mobile ships an update every 4 weeks, and DynamiqBook every 6 weeks. Most recently, Epsilon 3 Mobile was updated on October 10, 2026 and DynamiqBook 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.*