# UnderChat v2 vs Scale4 AI

UnderChat v2 and Scale4 AI 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. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | UnderChat v2 | Scale4 AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 97 MB | 3 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Natan Borba](https://appshunter.io/developer/1701921130) | [Embratec inovacoes ltda me](https://appshunter.io/developer/941488056) |

## What reviewers say

### UnderChat v2

[App page](https://appshunter.io/ios/app/underchat-v2/id6760209894)

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

**In-app purchases:** none


### Scale4 AI

[App page](https://appshunter.io/ios/app/scale4-ai/id6763393448)

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

**In-app purchases:** none


## Frequently asked questions

### Is UnderChat v2 free?

UnderChat v2 is free to download, with no in-app purchases.

### Is Scale4 AI free?

Scale4 AI is free to download, with no in-app purchases.

### Do UnderChat v2 or Scale4 AI have ads?

Neither UnderChat v2 nor Scale4 AI 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.*