# StringTracker vs Tension Lab

The clearest difference is update cadence: Tension Lab at every 4 days against StringTracker's every 19 months. On price, ads, in-app purchases and device support there is nothing between them.

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

StringTracker ships an update every 19 months, Tension Lab every 4 days. The most recent releases landed on October 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | StringTracker | Tension Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 4 days** |
| Size | 32 MB | 76 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rays Of Space Oy](https://appshunter.io/developer/1768753115) | [SEOKWON KONG](https://appshunter.io/developer/6803808680) |

## What reviewers say

### StringTracker

[App page](https://appshunter.io/ios/app/stringtracker/id6689519022)

**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 StringTracker free?

StringTracker 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 StringTracker or Tension Lab have ads?

Neither StringTracker nor Tension Lab shows ads.

### Which is updated more often, StringTracker or Tension Lab?

StringTracker ships an update every 19 months, and Tension Lab every 4 days. Most recently, StringTracker was updated on October 3, 2026 and Tension Lab on October 31, 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.*