# Katalyst vs Somnee

The clearest difference is rating: Katalyst at 4.6 against Somnee's 3.7. Katalyst also leads on review sentiment (81% vs 64%) and update cadence (every 3 weeks vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Katalyst holds the better App Store score, 4.6 against 3.7. Both are backed by a comparable volume of ratings — 58 and 71 respectively. Written reviews point the same way: 81% of Katalyst's written reviews are positive against 64% of Somnee's.

Katalyst ships an update every 3 weeks, Somnee every 2 months. The most recent releases landed on August 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Katalyst | Somnee |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (58 ratings)](https://appshunter.io/ios/app/katalyst/id1558163458/reviews)** | [3.7 (71 ratings)](https://appshunter.io/ios/app/somnee/id6445828473/reviews) |
| Number of ratings | 58 | **71** |
| Positive reviews | **80.6% of reviews** | 64.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 126 MB | 164 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Katalyst Interactive Inc.](https://appshunter.io/developer/1558163460) | [StimScience](https://appshunter.io/developer/1575603571) |

## What reviewers say

### Katalyst

[App page](https://appshunter.io/ios/app/katalyst/id1558163458)

This app enhances a revolutionary workout system using Electro Muscle Stimulation (EMS) to engage all muscles simultaneously. It offers a full-body workout in just 20 minutes, with zero joint load. Access diverse workout programs and control intensity for personalized training.

**Highlights:** Electro Muscle Stimulation (EMS) training, Full-body engagement, 20-minute workouts, Zero joint load, Diverse workout library (strength, power, cardio, recovery), Adjustable impulse intensity, Offline workout access

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### Somnee

[App page](https://appshunter.io/ios/app/somnee/id6445828473)

This app works with a smart headband to improve sleep quality using personalized neurostimulation and EEG tracking. It provides detailed sleep reports and insights to help you sleep faster, longer, and deeper.

**Highlights:** Personalized sleep neurostimulation, Clinical-grade EEG sleep tracking, Detailed sleep performance reports, AI sleep coach, Phone-free session start, Comfortable, breathable headband design

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

**In-app purchases:** none

**What reviewers like**

- 👍 Helps fall asleep faster
- 👍 Improves deep sleep quality
- 👍 Customer service is responsive and helpful
- 👍 App is easy to use
- 👍 Device is comfortable to wear

**What reviewers complain about**

- 🐛 App is buggy and unreliable
- 🐛 Device can be inaccurate in tracking sleep
- 🐛 Headband falls off frequently
- 🐛 Subscription model is mandatory and costly
- 🐛 Customer service can be unhelpful or evasive

**Reported bugs**

- App malfunctions and prevents use
- Sleep reports are delayed or unavailable
- Device asks for reset in the middle of the night but won't restart
- App stops tracking sleep if woken up and button is pressed
- Device inaccurately registers sleep patterns (e.g., REM sleep)

**Requested features**

- Add more sleep tones or meditation sounds
- Provide a better tutorial on data interpretation
- Improve headband design for comfort
- Offer bulk electrode sales
- Provide warranty on the headband


## Frequently asked questions

### Is Katalyst free?

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

### Is Somnee free?

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

### Which has better reviews, Katalyst or Somnee?

Katalyst is rated higher. Katalyst averages 4.6 out of 5 from 58 ratings, while Somnee averages 3.7 from 71 ratings.

### Do Katalyst or Somnee have ads?

Neither Katalyst nor Somnee shows ads.

### Which is updated more often, Katalyst or Somnee?

Katalyst ships an update every 3 weeks, and Somnee every 2 months. Most recently, Katalyst was updated on August 17, 2026 and Somnee on September 18, 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.*