# String Master vs String Tension AI

The clearest difference is in-app purchases: String Master at none against String Tension AI's 3. String Master also leads on ratings volume (7 vs 2) and iOS requirement (15.6 vs 17.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. String Tension AI sells 3 in-app purchases, starting at $4.99 per month. String Master asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for String Master against 5.0 for String Tension AI. Both are backed by a comparable volume of ratings — 7 and 2 respectively.

String Master ships an update weekly, String Tension AI every 5 days. The most recent releases landed on September 14, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | String Master | String Tension AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/string-master-tennis-log/id6757102423/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/string-tension-ai/id6763697805/reviews) |
| Number of ratings | **7** | 2 |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | **Free** | Freemium |
| Size | 71 MB | 33 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ORYONG KIM](https://appshunter.io/developer/1864541863) | [Trader Prosperity LLC](https://appshunter.io/developer/1895443729) |

## What reviewers say

### String Master

[App page](https://appshunter.io/ios/app/string-master-tennis-log/id6757102423)

Optimize your tennis game by precisely tracking string tension and durability. Record every restring, analyze string performance, and discover the best setups for your playstyle. Never guess about your strings again.

**Highlights:** Smart Restring logging, Custom string input, Smart String Finder, Restring reminders, Detailed logs and history, Hybrid setup support

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

**In-app purchases:** none


### String Tension AI

[App page](https://appshunter.io/ios/app/string-tension-ai/id6763697805)

This app uses your iPhone's microphone to measure the tension of your racquet strings. It tracks tension decay over time, offers personalized restring recommendations, and provides a comprehensive string toolkit for serious players.

**Highlights:** Measure string tension with iPhone microphone, Track tension decay over time, Personalized restring recommendations, String database and player setups, Playing session tracking, Cost tracking for restringing

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly PRO | $4.99 | per month |
| Annual PRO | $29.99 | per year |
| Lifetime PRO | $69.99 | one-time |


## Frequently asked questions

### Is String Master free?

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

### Is String Tension AI free?

String Tension AI is free to download, with in-app purchases available.

### Which has better reviews, String Master or String Tension AI?

String Master and String Tension AI are both rated 5.0 out of 5 on the App Store, from 7 and 2 ratings respectively.

### Do String Master or String Tension AI have ads?

Neither String Master nor String Tension AI shows ads.

### Which is updated more often, String Master or String Tension AI?

String Master ships an update weekly, and String Tension AI every 5 days. Most recently, String Master was updated on September 14, 2026 and String Tension AI on September 23, 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.*