# OnlyStrength vs CSP Amplify

The clearest difference is in-app purchases: CSP Amplify at none against OnlyStrength's 2. CSP Amplify also leads on review sentiment (100% vs 83%) and rating (5.0 vs 4.8). OnlyStrength's advantage is update cadence (every 10 days vs monthly). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. OnlyStrength sells 2 in-app purchases, starting at $34.99 per month. CSP Amplify asks for nothing beyond the download.

CSP Amplify holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 27 and 14 respectively. Written reviews point the same way: 83% of OnlyStrength's written reviews are positive against 100% of CSP Amplify's.

OnlyStrength ships an update every 10 days, CSP Amplify monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | OnlyStrength | CSP Amplify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (27 ratings)](https://appshunter.io/ios/app/onlystrength/id6473848495/reviews) | **[5.0 (14 ratings)](https://appshunter.io/ios/app/csp-amplify/id6751550881/reviews)** |
| Number of ratings | **27** | 14 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 76 MB | 62 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Challenger Training Systems Inc](https://appshunter.io/developer/1720025952) | [Cressey Training Systems, LLC](https://appshunter.io/developer/1835746183) |

## What reviewers say

### OnlyStrength

[App page](https://appshunter.io/ios/app/onlystrength/id6473848495)

This app offers comprehensive strength training and athletic performance programs designed by expert coaches. It provides guided workouts with detailed exercise instructions, progress tracking, and automatic weight calculations to help athletes improve speed, strength, and explosiveness.

**Highlights:** Progressed and guided programming, Detailed exercise instructions with video demos, Automatic weight calculations, Workout history tracking, Metric tracking for sprint times and jump scores, In-app rest timer, Community for expert guidance

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnlyStrength Premium Monthly | $34.99 | per month |
| OnlyStrength Premium Annual | $349.99 | per year |


### CSP Amplify

[App page](https://appshunter.io/ios/app/csp-amplify/id6751550881)

Access expert-designed exercises and personalized training programs trusted by professional athletes. Features hundreds of professionally filmed demonstrations, clear technique instructions, and progress tracking to help you maximize your performance. Optimized for serious athletes and fitness enthusiasts.

**Highlights:** Expert exercise library with hundreds of demonstrations, Personalized training recommendations, Progress tracking and workout history, Curated workout programs, Offline video playback, Dark mode support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OnlyStrength free?

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

### Is CSP Amplify free?

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

### Which has better reviews, OnlyStrength or CSP Amplify?

CSP Amplify is rated higher. OnlyStrength averages 4.8 out of 5 from 27 ratings, while CSP Amplify averages 5.0 from 14 ratings.

### Do OnlyStrength or CSP Amplify have ads?

Neither OnlyStrength nor CSP Amplify shows ads.

### Which is updated more often, OnlyStrength or CSP Amplify?

OnlyStrength ships an update every 10 days, and CSP Amplify monthly. Most recently, OnlyStrength was updated on October 5, 2026 and CSP Amplify on October 2, 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.*