# Implicit Differentiation Cal vs AT Genius

The clearest difference is update cadence: AT Genius at every 2 months against Implicit Differentiation Cal's every 9 months. On price, ads, 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.

Implicit Differentiation Cal ships an update every 9 months, AT Genius every 2 months. The most recent releases landed on December 5, 2025 and September 17, 2026 respectively.

## The numbers

| Metric | Implicit Differentiation Cal | AT Genius |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Size | 24 MB | 8 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ahmad Sattar](https://appshunter.io/developer/1458483953) | [Maneesh Johari](https://appshunter.io/developer/1331977894) |

## What reviewers say

### Implicit Differentiation Cal

[App page](https://appshunter.io/ios/app/implicit-differentiation-cal/id1607963477)

**Features:** macOS Compatibility

**In-app purchases:** none


### AT Genius

[App page](https://appshunter.io/ios/app/at-genius/id6740210846)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Implicit Differentiation Cal free?

Implicit Differentiation Cal is free to download, with no in-app purchases.

### Is AT Genius free?

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

### Do Implicit Differentiation Cal or AT Genius have ads?

Neither Implicit Differentiation Cal nor AT Genius shows ads.

### Which is updated more often, Implicit Differentiation Cal or AT Genius?

Implicit Differentiation Cal ships an update every 9 months, and AT Genius every 2 months. Most recently, Implicit Differentiation Cal was updated on December 5, 2025 and AT Genius on September 17, 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.*