# CFS Tracker vs SONA VNS

The clearest difference is rating: CFS Tracker at 3.0 against SONA VNS's 2.0. CFS Tracker also leads on device support (4 vs 2). SONA VNS's advantage is in-app purchases (none vs 16) and update cadence (fortnightly vs every 8 months). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. CFS Tracker sells 16 in-app purchases, starting at $4.95 per month. SONA VNS asks for nothing beyond the download.

CFS Tracker holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

CFS Tracker ships an update every 8 months, SONA VNS fortnightly. The most recent releases landed on September 9, 2026 and August 29, 2026 respectively.

## The numbers

| Metric | CFS Tracker | SONA VNS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/cfs-tracker/id6743564981/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/sona-vns/id6756424780/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 219 MB | 119 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Clarity Digital Therapeutics Inc](https://appshunter.io/developer/1721663167) | [Mindspire Limited](https://appshunter.io/developer/1586140980) |

## What reviewers say

### CFS Tracker

[App page](https://appshunter.io/ios/app/cfs-tracker/id6743564981)

This app helps individuals manage energy-limiting chronic illnesses by tracking symptoms, pacing, medications, and daily activities. It provides insights into patterns and trends to better understand health and communicate with healthcare providers.

**Highlights:** Log diverse symptoms including fatigue and brain fog, Track medications, supplements, and treatments, Record activity, rest, sleep, and nutrition, Customize tracking for personal health patterns, Set reminders for health routines, Monitor post-exertional malaise (PEM) and crashes, Review symptom trends with charts and summaries

**Features:** macOS Compatibility, Siri integration, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| flex pass | $4.95 | per month |
| easy pass | $5.99 | per 7 days |
| flex pass | $8.99 | per month |
| carey ai max | $19.99 | per month |
| yearly access | $19.99 | per year |
| smart pass | $24.99 | per year |
| carey ai ultra | $29.99 | per month |
| plus | $29.99 | per year |
| limited discount | $29.99 | per year |
| Premium Yearly | $34.99 | per year |
| yearly access | $39.99 | per year |
| Extended Trial | $39.99 | per year |
| 7-Day Trial | $49.99 | per year |
| store credit | $1.99 | one-time |
| carey ai credits | $8.99 | one-time |
| lifetime upgrade | $99.99 | one-time |


### SONA VNS

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

This app guides personalized, non-invasive vagus nerve stimulation sessions to support relaxation, sleep, and cognitive function. It tracks progress with analytics and integrates with wearables for deeper insights into your wellness journey.

**Highlights:** Personalized journey sessions, Daily taVNS for stress recovery, Guided audio and breathing exercises, Heart rate and HRV analytics, Wearable device integration, Progress tracking and streaks

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

**In-app purchases:** none


## Frequently asked questions

### Is CFS Tracker free?

CFS Tracker 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, CFS Tracker or SONA VNS?

CFS Tracker is rated higher. CFS Tracker averages 3.0 out of 5 from 2 ratings, while SONA VNS averages 2.0 from 1 ratings.

### Do CFS Tracker or SONA VNS have ads?

Neither CFS Tracker nor SONA VNS shows ads.

### Which is updated more often, CFS Tracker or SONA VNS?

CFS Tracker ships an update every 8 months, and SONA VNS fortnightly. Most recently, CFS Tracker was updated on September 9, 2026 and SONA VNS on August 29, 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.*