# Plena Biofeedback vs LensCal

The clearest difference is update cadence: LensCal at every 2 days against Plena Biofeedback's every 6 weeks. Plena Biofeedback's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Plena Biofeedback sells 2 in-app purchases, starting at $9.99 per month and LensCal sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Plena Biofeedback ships an update every 6 weeks, LensCal every 2 days. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Plena Biofeedback | LensCal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Size | 19 MB | 30 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kenneth Nygren](https://appshunter.io/developer/1861328307) | [Sergio Adrian Fernandez Figueredo](https://appshunter.io/developer/6774435713) |

## 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 |


### LensCal

[App page](https://appshunter.io/ios/app/lenscal/id6794762992)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $6.99 | per month |
| Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is Plena Biofeedback free?

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

### Is LensCal free?

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

### Do Plena Biofeedback or LensCal have ads?

Neither Plena Biofeedback nor LensCal shows ads.

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

Plena Biofeedback ships an update every 6 weeks, and LensCal every 2 days. Most recently, Plena Biofeedback was updated on October 25, 2026 and LensCal on October 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.*