# Breathe Flow vs SONA VNS

The clearest difference is review sentiment: Breathe Flow at 75% against SONA VNS's 0%. Breathe Flow also leads on rating (3.8 vs 1.5). SONA VNS's advantage is in-app purchases (none vs 2). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Breathe Flow sells 2 in-app purchases, starting at $4.49 per month. SONA VNS asks for nothing beyond the download.

Breathe Flow holds the better App Store score, 3.8 against 1.5. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews point the same way: 75% of Breathe Flow's written reviews are positive against 0% of SONA VNS's.

Breathe Flow ships an update every 3 weeks, SONA VNS every 2 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Breathe Flow | SONA VNS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/breathe-flow/id1598116167/reviews)** | [1.5 (2 ratings)](https://appshunter.io/ios/app/sona-vns/id6756424780/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | **75.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 62 MB | 133 MB |
| Requires iOS | **14.1** | 15.1 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Vagus Health Ltd](https://appshunter.io/developer/1502988847) | [Mindspire Limited](https://appshunter.io/developer/1586140980) |

## What reviewers say

### Breathe Flow

[App page](https://appshunter.io/ios/app/breathe-flow/id1598116167)

This app analyzes your breathing and heart rate using smartwatch ECG data to provide insights into your health. It offers guidance on improving breathing, reducing stress, and understanding how lifestyle factors impact your well-being. The app also introduces data ownership through VAGUS tokens.

**Highlights:** 30-second ECG test for breathing analysis, Personalized advice for breathing and stress reduction, Smartwatch data ownership with VAGUS tokens, VAGUS® ideal breathing curve guidance, Analysis of food, drink, and sleep impact on health, HRV & Breathing Sync Analytics subscription

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HRV & Breathing Sync Analytics | $4.49 | per month |
| V-NFT add on | $0.99 | one-time |


### SONA VNS

[App page](https://appshunter.io/ios/app/sona-vns/id6756424780)

This app guides you through personalized sessions using a wearable earpiece for non-invasive vagus nerve stimulation. Enhance relaxation, sleep, and cognitive function with audio, breathing exercises, and adaptive stimulation. Track your progress and integrate with other wellness devices.

**Highlights:** Personalized journey sessions, Daily taVNS for stress recovery, Multi-sensory wellness experience, Performance analytics (HR, HRV), Progress tracking and streaks, Integration with wearable devices

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

**In-app purchases:** none


## Frequently asked questions

### Is Breathe Flow free?

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

### Is SONA VNS free?

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

### Which has better reviews, Breathe Flow or SONA VNS?

Breathe Flow is rated higher. Breathe Flow averages 3.8 out of 5 from 4 ratings, while SONA VNS averages 1.5 from 2 ratings.

### Do Breathe Flow or SONA VNS have ads?

Neither Breathe Flow nor SONA VNS shows ads.

### Which is updated more often, Breathe Flow or SONA VNS?

Breathe Flow ships an update every 3 weeks, and SONA VNS every 2 weeks. Most recently, Breathe Flow was updated on November 3, 2026 and SONA VNS on November 5, 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.*