# iStem vs ThunderBeast

iStem and ThunderBeast are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. iStem sells 1 one-off in-app purchase and ThunderBeast sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | iStem | ThunderBeast |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 79 MB | 63 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jan Maes](https://appshunter.io/developer/1550506252) | [Tomocreate, Inc.](https://appshunter.io/developer/1895224165) |

## What reviewers say

### iStem

[App page](https://appshunter.io/ios/app/istem/id6793296941)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iStem Activation | $4.99 | one-time |


### ThunderBeast

[App page](https://appshunter.io/ios/app/thunderbeast/id6803942479)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThunderBeast Pro | $9.99 | one-time |


## Frequently asked questions

### Is iStem free?

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

### Is ThunderBeast free?

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

### Do iStem or ThunderBeast have ads?

Neither iStem nor ThunderBeast shows ads.

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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.*