# Memosaurus vs MTP Callsign Trainer

The clearest difference is in-app purchases: MTP Callsign Trainer at none against Memosaurus's 1. MTP Callsign Trainer also leads on update cadence (every 6 weeks vs every 13 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Memosaurus sells 1 one-off in-app purchase. MTP Callsign Trainer asks for nothing beyond the download.

Memosaurus ships an update every 13 months, MTP Callsign Trainer every 6 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Memosaurus | MTP Callsign Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 weeks** |
| Size | 8 MB | 49 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Jan Huber](https://appshunter.io/developer/1653723275) | [Oliver Bross](https://appshunter.io/developer/1859081127) |

## What reviewers say

### Memosaurus

[App page](https://appshunter.io/ios/app/memosaurus/id1672915883)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $5.99 | one-time |


### MTP Callsign Trainer

[App page](https://appshunter.io/ios/app/mtp-callsign-trainer/id6758036106)

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

**In-app purchases:** none


## Frequently asked questions

### Is Memosaurus free?

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

### Is MTP Callsign Trainer free?

MTP Callsign Trainer is free to download, with no in-app purchases.

### Do Memosaurus or MTP Callsign Trainer have ads?

Neither Memosaurus nor MTP Callsign Trainer shows ads.

### Which is updated more often, Memosaurus or MTP Callsign Trainer?

Memosaurus ships an update every 13 months, and MTP Callsign Trainer every 6 weeks. Most recently, Memosaurus was updated on October 25, 2026 and MTP Callsign Trainer on October 25, 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.*