# HerdCalc vs Chemo Brain Cognitive Research

The clearest difference is update cadence: Chemo Brain Cognitive Research at every 3 months against HerdCalc's every 11 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.

HerdCalc ships an update every 11 months, Chemo Brain Cognitive Research every 3 months. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | HerdCalc | Chemo Brain Cognitive Research |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Size | 18 MB | 302 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ceva Sante Animale S.A.](https://appshunter.io/developer/566622266) | [CogniFit](https://appshunter.io/developer/528285613) |

## What reviewers say

### HerdCalc

[App page](https://appshunter.io/ios/app/herdcalc/id1162619122)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chemo Brain Cognitive Research

[App page](https://appshunter.io/ios/app/chemo-brain-cognitive-research/id1412024302)

**In-app purchases:** none


## Frequently asked questions

### Is HerdCalc free?

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

### Is Chemo Brain Cognitive Research free?

Chemo Brain Cognitive Research is free to download, with no in-app purchases.

### Do HerdCalc or Chemo Brain Cognitive Research have ads?

Neither HerdCalc nor Chemo Brain Cognitive Research shows ads.

### Which is updated more often, HerdCalc or Chemo Brain Cognitive Research?

HerdCalc ships an update every 11 months, and Chemo Brain Cognitive Research every 3 months. Most recently, HerdCalc was updated on October 26, 2026 and Chemo Brain Cognitive Research on October 21, 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.*