# 2 Sides Challenge vs BrainParallel

The clearest difference is in-app purchases: 2 Sides Challenge at none against BrainParallel's 1. BrainParallel's advantage is iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. BrainParallel sells 1 one-off in-app purchase. 2 Sides Challenge asks for nothing beyond the download.

## The numbers

| Metric | 2 Sides Challenge | BrainParallel |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Size | 6 MB | 19 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dmitrii Nikolaev](https://appshunter.io/developer/1801292122) | [晓飞 沈](https://appshunter.io/developer/1888039228) |

## What reviewers say

### 2 Sides Challenge

[App page](https://appshunter.io/ios/app/2-sides-challenge/id6790892823)

**In-app purchases:** none


### BrainParallel

[App page](https://appshunter.io/ios/app/brainparallel/id6792762887)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $2.99 | one-time |


## Frequently asked questions

### Is 2 Sides Challenge free?

2 Sides Challenge is free to download, with no in-app purchases.

### Is BrainParallel free?

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

### Do 2 Sides Challenge or BrainParallel have ads?

Neither 2 Sides Challenge nor BrainParallel 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.*