# HBAP Immersions vs Tree

The clearest difference is in-app purchases: HBAP Immersions at none against Tree's 2. HBAP Immersions also leads on iOS requirement (9.0 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Tree sells 2 in-app purchases, starting at $4.99 per month. HBAP Immersions asks for nothing beyond the download.

HBAP Immersions ships an update every 2 months, Tree every 4 weeks. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HBAP Immersions | Tree |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Size | 55 MB | 38 MB |
| Requires iOS | **9.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Harvard Business School](https://appshunter.io/developer/383350531) | [Hleb Kuznetsov](https://appshunter.io/developer/1656043742) |

## What reviewers say

### HBAP Immersions

[App page](https://appshunter.io/ios/app/hbap-immersions/id1478944634)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tree

[App page](https://appshunter.io/ios/app/tree-train-your-brain/id6743909482)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per month |
| Premium | $19.99 | per year |


## Frequently asked questions

### Is HBAP Immersions free?

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

### Is Tree free?

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

### Do HBAP Immersions or Tree have ads?

Neither HBAP Immersions nor Tree shows ads.

### Which is updated more often, HBAP Immersions or Tree?

HBAP Immersions ships an update every 2 months, and Tree every 4 weeks. Most recently, HBAP Immersions was updated on October 29, 2026 and Tree on October 30, 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.*