# Letterbox Check vs UoP Bus

The clearest difference is update cadence: UoP Bus at every 3 months against Letterbox Check's every 12 months. Letterbox Check's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). 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.

Letterbox Check ships an update every 12 months, UoP Bus every 3 months. The most recent releases landed on September 9, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | Letterbox Check | UoP Bus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 months** |
| Size | 29 MB | 7 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Redburst Technologies AB](https://appshunter.io/developer/347889943) | [MICHAEL KIMBERLY SVRCEK](https://appshunter.io/developer/1738835413) |

## What reviewers say

### Letterbox Check

[App page](https://appshunter.io/ios/app/letterbox-check/id1485736636)

**In-app purchases:** none


### UoP Bus

[App page](https://appshunter.io/ios/app/uop-bus/id6736377088)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Letterbox Check free?

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

### Is UoP Bus free?

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

### Do Letterbox Check or UoP Bus have ads?

Neither Letterbox Check nor UoP Bus shows ads.

### Which is updated more often, Letterbox Check or UoP Bus?

Letterbox Check ships an update every 12 months, and UoP Bus every 3 months. Most recently, Letterbox Check was updated on September 9, 2026 and UoP Bus on September 5, 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.*