# Herman Interactive vs Brain Duo

The clearest difference is update cadence: Brain Duo at every 3 days against Herman Interactive's every 2 months. Brain Duo also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Herman Interactive sells 1 in-app purchase, starting at $9.99 per month and Brain Duo sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Herman Interactive ships an update every 2 months, Brain Duo every 3 days. The most recent releases landed on September 16, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Herman Interactive | Brain Duo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/brain-duo-brain-training/id6741551111/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 334 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [HERMGERM CORPORATION](https://appshunter.io/developer/1529646076) | [Brain Duo Tech LLC](https://appshunter.io/developer/1794668165) |

## What reviewers say

### Herman Interactive

[App page](https://appshunter.io/ios/app/herman-interactive/id1529646074)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Herman Monthly Subscription | $9.99 | per month |


### Brain Duo

[App page](https://appshunter.io/ios/app/brain-duo-brain-training/id6741551111)

Engage in fun games designed to enhance focus, concentration, problem-solving, and mental math. Discover more about yourself through personality and IQ tests while fostering personal growth and a sharper mind.

**Highlights:** Personalized brain workouts, Focus and concentration games, Problem-solving challenges, Mental math exercises, Personality and IQ tests, Promotes self-improvement

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access - Monthly | $3.99 | per month |
| Lifetime - Premium Access | $19.99 | one-time |


## Frequently asked questions

### Is Herman Interactive free?

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

### Is Brain Duo free?

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

### Do Herman Interactive or Brain Duo have ads?

Neither Herman Interactive nor Brain Duo shows ads.

### Which is updated more often, Herman Interactive or Brain Duo?

Herman Interactive ships an update every 2 months, and Brain Duo every 3 days. Most recently, Herman Interactive was updated on September 16, 2026 and Brain Duo on June 5, 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.*