# reli.check! vs MathArena Junior

The clearest difference is in-app purchases: reli.check! at none against MathArena Junior's 3. reli.check! also leads on update cadence (every 5 days vs every 2 weeks) and iOS requirement (9.1 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. MathArena Junior sells 3 in-app purchases, starting at $6.99 per month. reli.check! asks for nothing beyond the download.

reli.check! ships an update every 5 days, MathArena Junior every 2 weeks. The most recent releases landed on October 26, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | reli.check! | MathArena Junior |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 34 MB | 111 MB |
| Requires iOS | **9.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fluxguide Ausstellungssysteme GmbH](https://appshunter.io/developer/794336453) | [MatheArena GmbH](https://appshunter.io/developer/1424250411) |

## What reviewers say

### reli.check!

[App page](https://appshunter.io/ios/app/relicheck/id1425755616)

**In-app purchases:** none


### MathArena Junior

[App page](https://appshunter.io/ios/app/matharena-junior/id6443734276)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MathArena Monthly Subscription | $6.99 | per month |
| MathArena Annual Subscription | $22.99 | per year |
| MatheArena Junior One Time | $69.99 | one-time |


## Frequently asked questions

### Is reli.check! free?

reli.check! is free to download, with no in-app purchases.

### Is MathArena Junior free?

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

### Do reli.check! or MathArena Junior have ads?

Neither reli.check! nor MathArena Junior shows ads.

### Which is updated more often, reli.check! or MathArena Junior?

reli.check! ships an update every 5 days, and MathArena Junior every 2 weeks. Most recently, reli.check! was updated on October 26, 2026 and MathArena Junior on September 29, 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.*