# InVivo vs Perception Key

The clearest difference is in-app purchases: Perception Key at none against InVivo's 3. Perception Key also leads on iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. InVivo sells 3 in-app purchases, starting at $6.99 per month. Perception Key asks for nothing beyond the download.

## The numbers

| Metric | InVivo | Perception Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Size | 109 MB | 26 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Mercury Synergy s.r.o.](https://appshunter.io/developer/1281950391) | [Asnan Clinic EG](https://appshunter.io/developer/1727768175) |

## What reviewers say

### InVivo

[App page](https://appshunter.io/ios/app/invivo-ecg-ekg-course/id1659081673)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-Month Auto-Renew Premium | $6.99 | per month |
| 3-Month Auto-Renew Premium | $9.99 | per 3 months |
| Annual Auto-Renew Premium | $19.99 | per year |


### Perception Key

[App page](https://appshunter.io/ios/app/perception-key/id6476829247)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is InVivo free?

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

### Is Perception Key free?

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

### Do InVivo or Perception Key have ads?

Neither InVivo nor Perception Key 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.*