# Callibri Biofeedback vs Focus 'n Flow

The clearest difference is in-app purchases: Callibri Biofeedback at none against Focus 'n Flow's 1. Focus 'n Flow's advantage is update cadence (weekly vs every 4 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Focus 'n Flow sells 1 in-app purchase, starting at $99.99 per month. Callibri Biofeedback asks for nothing beyond the download.

Callibri Biofeedback ships an update every 4 months, Focus 'n Flow weekly. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Callibri Biofeedback | Focus 'n Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/callibri-biofeedback/id1517798639/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free | — |
| Size | 269 MB | 459 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [BRAINBIT INC.](https://appshunter.io/developer/1510548622) | [BrainTrain Inc.](https://appshunter.io/developer/584469134) |

## What reviewers say

### Callibri Biofeedback

[App page](https://appshunter.io/ios/app/callibri-biofeedback/id1517798639)

This system uses a sensor to measure muscle tone and visualizes your muscle activity in a game-like interface. It's designed for self-regulation training to improve muscle strength and bodily functions.

**Highlights:** Muscle tone evaluation (EMG signal), Visualizes muscle activity in games, Muscle restoration for stroke/CP, Home fitness muscle strengthening, Increases physiological reserves

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

**In-app purchases:** none


### Focus 'n Flow

[App page](https://appshunter.io/ios/app/focus-n-flow/id6744942854)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month of Cloud And Guidance | $99.99 | per month |


## Frequently asked questions

### Is Callibri Biofeedback free?

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

### Is Focus 'n Flow free?

Focus 'n Flow is free to download, with in-app purchases available.

### Do Callibri Biofeedback or Focus 'n Flow have ads?

Neither Callibri Biofeedback nor Focus 'n Flow shows ads.

### Which is updated more often, Callibri Biofeedback or Focus 'n Flow?

Callibri Biofeedback ships an update every 4 months, and Focus 'n Flow weekly. Most recently, Callibri Biofeedback was updated on November 3, 2026 and Focus 'n Flow on October 28, 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.*