# Katalyst vs Tether

The clearest difference is in-app purchases: Katalyst at none against Tether's 2. Katalyst also leads on ratings volume (59 vs 3). Tether's advantage is rating (5.0 vs 4.6) and review sentiment (100% vs 81%). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Tether sells 2 in-app purchases, starting at $9.99 per month. Katalyst asks for nothing beyond the download.

Tether holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Katalyst has 59 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 81% of Katalyst's written reviews are positive against 100% of Tether's.

Katalyst ships an update every 3 weeks, Tether fortnightly. The most recent releases landed on October 25, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Katalyst | Tether |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (59 ratings)](https://appshunter.io/ios/app/katalyst/id1558163458/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tether-personal-growth/id6762101899/reviews)** |
| Number of ratings | **59** | 3 |
| Positive reviews | 80.6% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 155 MB | 44 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Katalyst Interactive Inc.](https://appshunter.io/developer/1558163460) | [Dennis Corsi](https://appshunter.io/developer/1892916134) |

## 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


### Tether

[App page](https://appshunter.io/ios/app/tether-personal-growth/id6762101899)

This AI-powered coach helps you reconnect with your personal growth intentions. It listens to your shared experiences over time to reflect your progress and keep you aligned with your values and desired identity.

**Highlights:** AI-powered personal growth coach, Focus on identity and values, Personalized reflection of progress, Builds a long-term user profile, Daily conversational nudges, Starts with a single intention word

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tether — Monthly | $9.99 | per month |
| Tether — Annual | $79.00 | per year |


## Frequently asked questions

### Is Katalyst free?

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

### Is Tether free?

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

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

Tether is rated higher. Katalyst averages 4.6 out of 5 from 59 ratings, while Tether averages 5.0 from 3 ratings.

### Do Katalyst or Tether have ads?

Neither Katalyst nor Tether shows ads.

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

Katalyst ships an update every 3 weeks, and Tether fortnightly. Most recently, Katalyst was updated on October 25, 2026 and Tether on October 16, 2026.

---

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