# 三双 vs PerformanceX

三双 and PerformanceX are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 三双 sells 3 in-app purchases, starting at $3.99 per month 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.

## The numbers

| Metric | 三双 | PerformanceX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 119 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Xi'an Mengdong Network Technology Co., Ltd.](https://appshunter.io/developer/1687598458) | [顽石运动智能科技(北京)有限公司](https://appshunter.io/developer/1112625269) |

## What reviewers say

### 三双

[App page](https://appshunter.io/ios/app/id6740458396)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月会员 | $3.99 | per month |
| 连续包年会员 | $24.99 | per year |
| 永久会员 | $9.99 | one-time |


### 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 三双 free?

三双 is free to download, with in-app purchases available.

### Is PerformanceX free?

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

### Do 三双 or PerformanceX have ads?

Neither 三双 nor PerformanceX shows ads.

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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.*