# Mental Math Trainer vs Retainly

Mental Math Trainer and Retainly are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Mental Math Trainer sells 7 in-app purchases, starting at $2.99 per month and Retainly sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Mental Math Trainer | Retainly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (228 ratings)](https://appshunter.io/ios/app/mental-math-trainer-puremath/id684305542/reviews)** | — |
| Number of ratings | **228** | — |
| Positive reviews | 57.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 45 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Stoyan Hristov](https://appshunter.io/developer/584595816) | [TOBES LTD](https://appshunter.io/developer/1539339323) |

## What reviewers say

### Mental Math Trainer

[App page](https://appshunter.io/ios/app/mental-math-trainer-puremath/id684305542)

Enhance your arithmetic abilities with this app. Practice addition, subtraction, multiplication, and division through engaging games and custom sessions. Track your progress and challenge friends to boost your mental math confidence and speed.

**Highlights:** Addition, subtraction, multiplication, division practice, Math Arcade mode with increasing difficulty, Customizable practice sessions, Memory training games (Find the Pairs), Progress tracking, Game Center integration for challenges

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access | $2.99 | per month |
| Unlimited Access | $2.99 | per 7 days |
| Unlimited Access | $3.99 | per month |
| Unlimited Access | $9.99 | per year |
| Unlimited Access | $12.99 | per year |
| Unlimited Access | $14.99 | per year |
| Unlock Everything | $17.99 | one-time |

**What reviewers like**

- 🧠 Brain training and mental sharpness
- 👍 Useful for math skills improvement
- 🚀 Fast and easy to use
- ✅ Good for daily practice
- 💡 Gamifies math learning

**What reviewers complain about**

- 💸 Most features are paid/locked
- 💰 Deceptive free version
- 😩 Repetitive questions/levels
- 🐌 Slow animations
- 📱 UI can be improved (keypad style)

**Reported bugs**

- App crashes or doesn't open
- Purchases not unlocking features
- In-app purchase issues
- Timer continues when paused
- Drag response not registering input

**Requested features**

- Option to choose keypad style
- More difficult levels
- Infinite or custom exercise mode
- Dark mode support
- Landscape mode support


### Retainly

[App page](https://appshunter.io/ios/app/retainly/id6749798542)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $4.99 | per month |


## Frequently asked questions

### Is Mental Math Trainer free?

Mental Math Trainer is free to download, with in-app purchases available.

### Is Retainly free?

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

### Do Mental Math Trainer or Retainly have ads?

Neither Mental Math Trainer nor Retainly shows ads.

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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.*