# Mentor Books vs Trinity Open Day

The clearest difference is iOS requirement: Mentor Books at 14.0 against Trinity Open Day's 16.6. 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.

Mentor Books ships an update every 5 months, Trinity Open Day every 3 months. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Mentor Books | Trinity Open Day |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Size | 22 MB | 60 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Mentor Books](https://appshunter.io/developer/556026395) | [Trinity College Dublin Commercial](https://appshunter.io/developer/1583568942) |

## What reviewers say

### Mentor Books

[App page](https://appshunter.io/ios/app/mentor-books/id556026392)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trinity Open Day

[App page](https://appshunter.io/ios/app/trinity-open-day/id6470378702)

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Mentor Books free?

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

### Is Trinity Open Day free?

Trinity Open Day is free to download, with no in-app purchases.

### Do Mentor Books or Trinity Open Day have ads?

Neither Mentor Books nor Trinity Open Day shows ads.

### Which is updated more often, Mentor Books or Trinity Open Day?

Mentor Books ships an update every 5 months, and Trinity Open Day every 3 months. Most recently, Mentor Books was updated on October 26, 2026 and Trinity Open Day on October 22, 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.*