# Spinfire Pro 2 vs String Master

The clearest difference is update cadence: String Master at weekly against Spinfire Pro 2's monthly. Spinfire Pro 2's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 15.6). On price, 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.

Spinfire Pro 2 ships an update monthly, String Master weekly. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Spinfire Pro 2 | String Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/string-master-tennis-log/id6757102423/reviews)** |
| Number of ratings | — | **7** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Free |
| Size | 54 MB | 71 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The trustee for The Fry Developments Trust](https://appshunter.io/developer/1750172875) | [ORYONG KIM](https://appshunter.io/developer/1864541863) |

## What reviewers say

### Spinfire Pro 2

[App page](https://appshunter.io/ios/app/spinfire-pro-2/id6503728031)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Spinfire Pro 2 free?

Spinfire Pro 2 is free to download, with no in-app purchases.

### Is String Master free?

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

### Do Spinfire Pro 2 or String Master have ads?

Neither Spinfire Pro 2 nor String Master shows ads.

### Which is updated more often, Spinfire Pro 2 or String Master?

Spinfire Pro 2 ships an update monthly, and String Master weekly. Most recently, Spinfire Pro 2 was updated on September 24, 2026 and String Master on September 14, 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.*