# iformula vs Topos

The clearest difference is in-app purchases: iformula at none against Topos's 2. iformula also leads on iOS requirement (17.6 vs 26.0). Topos's advantage is update cadence (every 5 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Topos sells 2 in-app purchases, starting at $5.99 per month. iformula asks for nothing beyond the download.

iformula ships an update every 2 months, Topos every 5 days. The most recent releases landed on June 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | iformula | Topos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/iformula/id325337275/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 69.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 59 MB | 8 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tobias Werner](https://appshunter.io/developer/325337278) | [Anthem Labs](https://appshunter.io/developer/1883829488) |

## 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

**In-app purchases:** none


### Topos

[App page](https://appshunter.io/ios/app/topos-ai-memory-palace/id6758406420)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| topos Pro | $5.99 | per month |
| topos Pro | $49.99 | per year |


## Frequently asked questions

### Is iformula free?

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

### Is Topos free?

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

### Do iformula or Topos have ads?

Neither iformula nor Topos shows ads.

### Which is updated more often, iformula or Topos?

iformula ships an update every 2 months, and Topos every 5 days. Most recently, iformula was updated on June 10, 2026 and Topos 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.*