# Complex Memory Trainer vs Fill

The clearest difference is ads: Fill at none against Complex Memory Trainer's shown. Complex Memory Trainer's advantage is update cadence (every 16 months vs every 33 months) and iOS requirement (8.1 vs 13.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Complex Memory Trainer ships an update every 16 months, Fill every 33 months. The most recent releases landed on September 16, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Complex Memory Trainer | Fill |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 16 months** | Every 33 months |
| Size | 65 MB | 91 MB |
| Requires iOS | **8.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ruslan Goncharenko](https://appshunter.io/developer/934710362) | [Hieu Hoang](https://appshunter.io/developer/1108291419) |

## What reviewers say

### Complex Memory Trainer

[App page](https://appshunter.io/ios/app/complex-memory-trainer/id1147148504)

**Features:** macOS Compatibility

**In-app purchases:** none


### Fill

[App page](https://appshunter.io/ios/app/fill-one-line-puzzle/id6448170146)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Complex Memory Trainer free?

Complex Memory Trainer is free to download, with no in-app purchases.

### Is Fill free?

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

### Do Complex Memory Trainer or Fill have ads?

Complex Memory Trainer shows ads; Fill does not.

### Which is updated more often, Complex Memory Trainer or Fill?

Complex Memory Trainer ships an update every 16 months, and Fill every 33 months. Most recently, Complex Memory Trainer was updated on September 16, 2026 and Fill on September 11, 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.*