# Klein vs KC9PERFORMANCE

The clearest difference is ads: Klein at none against KC9PERFORMANCE's shown. Klein also leads on update cadence (fortnightly vs every 3 months) and ratings volume (25 vs 1). KC9PERFORMANCE's advantage is rating (5.0 vs 4.6). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Klein sells 2 in-app purchases, starting at $14.99 per month and KC9PERFORMANCE sells 1 in-app purchase, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

KC9PERFORMANCE holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Klein has 25 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Klein ships an update fortnightly, KC9PERFORMANCE every 3 months. The most recent releases landed on September 21, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Klein | KC9PERFORMANCE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (25 ratings)](https://appshunter.io/ios/app/klein-athletic-training/id1626523970/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kc9performance/id6526491650/reviews)** |
| Number of ratings | **25** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 73 MB | 89 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Klein Sports Performance, LLC](https://appshunter.io/developer/1626523972) | [KEN DARREN CHARLES](https://appshunter.io/developer/1756312118) |

## What reviewers say

### Klein

[App page](https://appshunter.io/ios/app/klein-athletic-training/id1626523970)

This app offers customizable strength and mobility programs for athletes and fitness enthusiasts. It provides sports-specific training, dynamic exercise selection, and video demonstrations to help users maximize performance and reach their goals. Users can also connect with a community of athletes and coaches.

**Highlights:** Customizable strength and mobility programs, Sports-specific training modules, Dynamic exercise selection, Video demonstrations and tutorials, Expert-designed programming, Community and social features

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Klein Strength Premium | $14.99 | per month |
| Annual Klein Strength Premium | $99.99 | per year |


### KC9PERFORMANCE

[App page](https://appshunter.io/ios/app/kc9performance/id6526491650)

This app provides aspiring footballers with comprehensive training programs, nutrition plans, and mindset coaching to help them achieve professional status. It offers personalized gym routines, seasonal training, and position-specific drills, all developed by a professional footballer.

**Highlights:** Personalized gym programs, Seasonal training plans, Position-specific drills, Nutrition plans, Injury prevention strategies, Mindset coaching, Community support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Complete Membership | $19.99 | per month |


## Frequently asked questions

### Is Klein free?

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

### Is KC9PERFORMANCE free?

KC9PERFORMANCE is free to download, with in-app purchases available.

### Which has better reviews, Klein or KC9PERFORMANCE?

KC9PERFORMANCE is rated higher. Klein averages 4.6 out of 5 from 25 ratings, while KC9PERFORMANCE averages 5.0 from 1 ratings.

### Do Klein or KC9PERFORMANCE have ads?

KC9PERFORMANCE shows ads; Klein does not.

### Which is updated more often, Klein or KC9PERFORMANCE?

Klein ships an update fortnightly, and KC9PERFORMANCE every 3 months. Most recently, Klein was updated on September 21, 2026 and KC9PERFORMANCE on September 14, 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.*