# SONA VNS vs Skill Tree

The clearest difference is rating: Skill Tree at 5.0 against SONA VNS's 2.0. SONA VNS's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs every 6 weeks). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Skill Tree sells 2 in-app purchases, starting at $1.99 per month. SONA VNS asks for nothing beyond the download.

Skill Tree holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

SONA VNS ships an update fortnightly, Skill Tree every 6 weeks. The most recent releases landed on August 29, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | SONA VNS | Skill Tree |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/sona-vns/id6756424780/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/skill-tree/id6758092779/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | **Free** | Subscription |
| Size | 119 MB | 58 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Mindspire Limited](https://appshunter.io/developer/1586140980) | [Jeffrey Byles](https://appshunter.io/developer/1767856053) |

## What reviewers say

### 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


### Skill Tree

[App page](https://appshunter.io/ios/app/skill-tree/id6758092779)

Visualize and strategize your Brazilian Jiu-Jitsu game with a custom mind map. Organize skills, highlight areas for focused training, and attach videos to moves. Progress faster by clearly mapping out your martial arts journey.

**Highlights:** Customizable mind map visualization, Color-coded skill categorization, Highlighting skills for deliberate training, Video attachment for moves, Progress tracking for BJJ game

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $1.99 | per month |
| Yearly Plan | $14.99 | per year |


## Frequently asked questions

### Is SONA VNS free?

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

### Is Skill Tree free?

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

### Which has better reviews, SONA VNS or Skill Tree?

Skill Tree is rated higher. SONA VNS averages 2.0 out of 5 from 1 ratings, while Skill Tree averages 5.0 from 1 ratings.

### Do SONA VNS or Skill Tree have ads?

Neither SONA VNS nor Skill Tree shows ads.

### Which is updated more often, SONA VNS or Skill Tree?

SONA VNS ships an update fortnightly, and Skill Tree every 6 weeks. Most recently, SONA VNS was updated on August 29, 2026 and Skill Tree on July 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*