# Plena Biofeedback vs Coherence

The clearest difference is in-app purchases: Coherence at none against Plena Biofeedback's 2. Coherence also leads on update cadence (daily vs every 6 weeks) and iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Plena Biofeedback sells 2 in-app purchases, starting at $9.99 per month. Coherence asks for nothing beyond the download.

Plena Biofeedback ships an update every 6 weeks, Coherence daily. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Plena Biofeedback | Coherence |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Daily** |
| Size | 19 MB | 16 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Kenneth Nygren](https://appshunter.io/developer/1861328307) | [Outliyr](https://appshunter.io/developer/1894981246) |

## What reviewers say

### Plena Biofeedback

[App page](https://appshunter.io/ios/app/plena-biofeedback/id6756549507)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plena Premium (Monthly) | $9.99 | per month |
| Premium Annual | $59.99 | per year |


### Coherence

[App page](https://appshunter.io/ios/app/coherence-hrv-biofeedback/id6787523963)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Plena Biofeedback free?

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

### Is Coherence free?

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

### Do Plena Biofeedback or Coherence have ads?

Neither Plena Biofeedback nor Coherence shows ads.

### Which is updated more often, Plena Biofeedback or Coherence?

Plena Biofeedback ships an update every 6 weeks, and Coherence daily. Most recently, Plena Biofeedback was updated on November 5, 2026 and Coherence on November 10, 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.*