# Mental Math vs B.I.S.F.

The clearest difference is in-app purchases: B.I.S.F. at none against Mental Math's 10. B.I.S.F. also leads on iOS requirement (15.6 vs 17.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 10 in-app purchases, starting at $4.99 per 7 days. B.I.S.F. asks for nothing beyond the download.

Mental Math ships an update every 3 weeks, B.I.S.F. monthly. The most recent releases landed on September 22, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Mental Math | B.I.S.F. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/mental-math-mathee/id6502719157/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 28 MB | 38 MB |
| Requires iOS | 17.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Andrey Lebedev](https://appshunter.io/developer/636486462) | [Hadi Ezzeddine](https://appshunter.io/developer/1638122399) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-mathee/id6502719157)

Enhance your arithmetic abilities with daily math challenges. This app offers over 30 difficulty levels, personalized exercises, and progress tracking to help users of all ages improve their calculation speed and accuracy.

**Highlights:** 30+ difficulty levels, Personalized exercises, Progress tracking, Quick sessions, User-friendly design, Engaging and interactive

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plus | $4.99 | per 7 days |
| Premium Plus | $4.99 | per 7 days |
| Premium Plus | $5.99 | per month |
| Premium Plus | $11.99 | per 3 months |
| Premium Plus | $14.99 | per year |
| Premium Plus | $17.49 | per year |
| Premium Plus | $24.99 | per year |
| Premium Plus | $24.99 | per year |
| Premium Plus | $39.99 | per year |
| Premium Plus | $39.99 | one-time |


### B.I.S.F.

[App page](https://appshunter.io/ios/app/bisf/id6752570292)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math free?

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

### Is B.I.S.F. free?

B.I.S.F. is free to download, with no in-app purchases.

### Do Mental Math or B.I.S.F. have ads?

Neither Mental Math nor B.I.S.F. shows ads.

### Which is updated more often, Mental Math or B.I.S.F.?

Mental Math ships an update every 3 weeks, and B.I.S.F. monthly. Most recently, Mental Math was updated on September 22, 2026 and B.I.S.F. on October 13, 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.*