# MemTrainer vs Hidden Numbers

The clearest difference is in-app purchases: MemTrainer at none against Hidden Numbers's 1. Hidden Numbers's advantage is update cadence (every 12 months vs every 57 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Hidden Numbers sells 1 one-off in-app purchase. MemTrainer asks for nothing beyond the download.

MemTrainer ships an update every 57 months, Hidden Numbers every 12 months. The most recent releases landed on September 17, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | MemTrainer | Hidden Numbers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hidden-numbers-math-game/id1134423185/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 57 months | **Every 12 months** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 18 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [POK](https://appshunter.io/developer/357275870) | [Michal Sajban](https://appshunter.io/developer/1523258286) |

## What reviewers say

### MemTrainer

[App page](https://appshunter.io/ios/app/memtrainer/id506423958)

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

**In-app purchases:** none


### Hidden Numbers

[App page](https://appshunter.io/ios/app/hidden-numbers-math-game/id1134423185)

Master math and counting with engaging puzzles. This game offers dynamic modes, custom difficulty, and timed or relaxed play. Compete globally and play offline to sharpen your arithmetic skills.

**Highlights:** 7 Dynamic Game Modes, Custom Difficulty, Timed vs. Relaxed Play, Global Leaderboards, 100% Offline Play, Arithmetic Skill Improvement

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version + no ads! | $1.99 | one-time |


## Frequently asked questions

### Is MemTrainer free?

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

### Is Hidden Numbers free?

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

### Do MemTrainer or Hidden Numbers have ads?

Both MemTrainer and Hidden Numbers show ads.

### Which is updated more often, MemTrainer or Hidden Numbers?

MemTrainer ships an update every 57 months, and Hidden Numbers every 12 months. Most recently, MemTrainer was updated on September 17, 2026 and Hidden Numbers on September 29, 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.*