# RacketLog vs String Tension AI

The clearest difference is update cadence: RacketLog at daily against String Tension AI's every 5 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. RacketLog sells 1 in-app purchase, starting at $14.99 per year and String Tension AI sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

RacketLog ships an update daily, String Tension AI every 5 days. The most recent releases landed on August 20, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | RacketLog | String Tension AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/string-tension-ai/id6763697805/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 5 days |
| Monetization | — | Freemium |
| Size | 5 MB | 33 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FrearBros Labs USA Inc.](https://appshunter.io/developer/1833510300) | [Trader Prosperity LLC](https://appshunter.io/developer/1895443729) |

## What reviewers say

### RacketLog

[App page](https://appshunter.io/ios/app/racketlog/id6759014238)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RacketLog Premium | $14.99 | per year |


### 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 RacketLog free?

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

### Is String Tension AI free?

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

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

Neither RacketLog nor String Tension AI shows ads.

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

RacketLog ships an update daily, and String Tension AI every 5 days. Most recently, RacketLog was updated on August 20, 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.*