# Tennis String Tracker vs Tension Lab

The clearest difference is iOS requirement: Tension Lab at 15.1 against Tennis String Tracker's 26.5. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 9, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Tennis String Tracker | Tension Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Size | 4 MB | 72 MB |
| Requires iOS | 26.5 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BONGSANG KIM](https://appshunter.io/developer/6789788798) | [SEOKWON KONG](https://appshunter.io/developer/6803808680) |

## What reviewers say

### Tennis String Tracker

[App page](https://appshunter.io/ios/app/tennis-string-tracker/id6790567672)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tension Lab

[App page](https://appshunter.io/ios/app/tension-lab-string-tension/id6803808678)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tennis String Tracker free?

Tennis String Tracker is free to download, with no in-app purchases.

### Is Tension Lab free?

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

### Do Tennis String Tracker or Tension Lab have ads?

Neither Tennis String Tracker nor Tension Lab shows ads.

### Which is updated more often, Tennis String Tracker or Tension Lab?

Tennis String Tracker ships an update every 4 days, and Tension Lab every 4 days. Most recently, Tennis String Tracker was updated on October 9, 2026 and Tension Lab on October 7, 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.*