# iformula vs Brain Teaser Games

The clearest difference is in-app purchases: iformula at none against Brain Teaser Games's 4. Brain Teaser Games's advantage is iOS requirement (13.0 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Brain Teaser Games sells 4 in-app purchases, starting at $4.99 per 7 days. iformula asks for nothing beyond the download.

iformula ships an update every 2 months, Brain Teaser Games monthly. The most recent releases landed on October 13, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | iformula | Brain Teaser Games |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/iformula/id325337275/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 65.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 59 MB | 48 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tobias Werner](https://appshunter.io/developer/325337278) | [DFX Group](https://appshunter.io/developer/1850691038) |

## What reviewers say

### iformula

[App page](https://appshunter.io/ios/app/iformula/id325337275)

This app is a comprehensive math learning platform for students and professionals. It offers a vast library of over 1000 math equations and topics, along with features like search, note-taking, and bookmarking. It aims to eliminate the need for physical math textbooks.

**Highlights:** 1000+ math equations and topics, Full-featured search functionality, Note-taking system, Bookmarking for favorite equations, Dual language support (English & German), Dark mode support

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

**In-app purchases:** none


### Brain Teaser Games

[App page](https://appshunter.io/ios/app/brain-teaser-games/id6758458855)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly-Trial | $4.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $39.99 | per year |


## Frequently asked questions

### Is iformula free?

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

### Is Brain Teaser Games free?

Brain Teaser Games is free to download, with in-app purchases available.

### Do iformula or Brain Teaser Games have ads?

Neither iformula nor Brain Teaser Games shows ads.

### Which is updated more often, iformula or Brain Teaser Games?

iformula ships an update every 2 months, and Brain Teaser Games monthly. Most recently, iformula was updated on October 13, 2026 and Brain Teaser Games on September 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.*