# FormCheck AI vs PerformanceX

The clearest difference is price: PerformanceX at Free against FormCheck AI's $0.99. FormCheck AI's advantage is chart position (#94 vs unranked) and update cadence (fortnightly vs monthly). On ads, in-app purchases, monetization model and device support there is nothing between them.

PerformanceX is free to download; FormCheck AI costs $0.99 up front. FormCheck AI sells 6 in-app purchases, starting at $1.99 per 7 days and PerformanceX sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

FormCheck AI ships an update fortnightly, PerformanceX monthly. The most recent releases landed on September 23, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | FormCheck AI | PerformanceX |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/formcheck-ai/id1621267448/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 58.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#94** | — |
| Size | 472 MB | 119 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Purestrength Limited](https://appshunter.io/developer/1621267450) | [顽石运动智能科技(北京)有限公司](https://appshunter.io/developer/1112625269) |

## What reviewers say

### FormCheck AI

[App page](https://appshunter.io/ios/app/formcheck-ai/id1621267448)

**Currently charting:** #94 Top Paid · Health & Fitness (US App Store)

This AI-powered personal trainer analyzes your exercise videos to provide instant feedback on your squat, deadlift, and bench press form. Improve your technique, prevent injuries, and achieve your fitness goals with personalized guidance.

**Highlights:** AI video analysis for exercise form, Deadlift, squat, and bench press correction, Injury prevention guidance, Personalized AI feedback, Progress tracking, Fitness and nutrition articles

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| weekly pro | $1.99 | per 7 days |
| Discounted Monthly Sub | $4.99 | per month |
| weekly pro | $9.99 | per 7 days |
| Monthly Subscription | $19.99 | per month |
| Yearly Subscription | $19.99 | per year |
| Discounted Yearly Subscription | $99.99 | per year |


### PerformanceX

[App page](https://appshunter.io/ios/app/performancex/id6745584273)

This app uses advanced video analysis and biomechanical algorithms to provide precise jump performance testing and data analysis for athletes and coaches. It offers various jump tests, strength-speed relationship analysis, and functional strength assessments, with detailed biomechanical parameter calculations.

**Highlights:** Vertical jump testing (CMJ, SJ, DJ), Strength-speed relationship analysis, Functional strength testing (Nordic Hamstring), Automatic biomechanical parameter calculation, Video analysis with high frame rate support, Athlete and team data management, CSV data export

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $2.99 | per month |
| 年度会员 | $24.99 | per year |
| 终身会员 | $59.99 | one-time |


## Frequently asked questions

### Is FormCheck AI free?

FormCheck AI costs $0.99, and also offers in-app purchases.

### Is PerformanceX free?

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

### Do FormCheck AI or PerformanceX have ads?

Neither FormCheck AI nor PerformanceX shows ads.

### Which is updated more often, FormCheck AI or PerformanceX?

FormCheck AI ships an update fortnightly, and PerformanceX monthly. Most recently, FormCheck AI was updated on September 23, 2026 and PerformanceX on September 15, 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.*