# 2sBrain vs Index

The clearest difference is iOS requirement: 2sBrain at 15.5 against Index's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 2sBrain sells 3 in-app purchases, starting at $3.99 per month and Index sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 2sBrain | Index |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 66 MB | 19 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Nhu Vuong](https://appshunter.io/developer/1486864462) | [Sunset Capital, llc](https://appshunter.io/developer/6778595232) |

## What reviewers say

### 2sBrain

[App page](https://appshunter.io/ios/app/2sbrainai-pdf-document-reader/id6768344372)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly | $3.99 | per month |
| VIP Yearly | $19.99 | per year |
| VIP Lifetime | $39.99 | one-time |


### Index

[App page](https://appshunter.io/ios/app/index-save-anything/id6792155273)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Index Pro Monthly | $9.99 | per month |
| Index Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is 2sBrain free?

2sBrain is free to download, with in-app purchases available.

### Is Index free?

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

### Do 2sBrain or Index have ads?

Neither 2sBrain nor Index 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.*