# Mettis Instructor vs J

Mettis Instructor and J 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 | Mettis Instructor | J |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 31 MB | 42 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mettis AI](https://appshunter.io/developer/1854102469) | [Technoshark](https://appshunter.io/developer/1760011497) |

## What reviewers say

### Mettis Instructor

[App page](https://appshunter.io/ios/app/mettis-instructor/id6759099435)

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

**In-app purchases:** none


### J

[App page](https://appshunter.io/ios/app/j-school/id6787035737)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mettis Instructor free?

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

### Is J free?

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

### Do Mettis Instructor or J have ads?

Neither Mettis Instructor nor J 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.*