# TRN App vs Dosis!

The clearest difference is device support: TRN App at 3 against Dosis!'s 1. TRN App also leads on iOS requirement (13.0 vs 16.0). 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.

TRN App ships an update every 3 weeks, Dosis! monthly. The most recent releases landed on September 20, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | TRN App | Dosis! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 45 MB | 8 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Training Response Network, Inc.](https://appshunter.io/developer/971483232) | [Dirk Schulze Röntgendiagnostik GmbH](https://appshunter.io/developer/6788745410) |

## What reviewers say

### TRN App

[App page](https://appshunter.io/ios/app/trn-app/id6443707193)

**Features:** macOS Compatibility

**In-app purchases:** none


### Dosis!

[App page](https://appshunter.io/ios/app/dosis/id6788745408)

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

**In-app purchases:** none


## Frequently asked questions

### Is TRN App free?

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

### Is Dosis! free?

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

### Do TRN App or Dosis! have ads?

Neither TRN App nor Dosis! shows ads.

### Which is updated more often, TRN App or Dosis!?

TRN App ships an update every 3 weeks, and Dosis! monthly. Most recently, TRN App was updated on September 20, 2026 and Dosis! on September 30, 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.*