# Sole Dynamix vs SprintStart

The clearest difference is price: Sole Dynamix at Free against SprintStart's $2.99. Sole Dynamix also leads on iOS requirement (15.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Sole Dynamix is free to download; SprintStart costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sole Dynamix ships an update every 3 months, SprintStart every 4 months. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sole Dynamix | SprintStart |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | — | Paid |
| Size | 129 MB | 3 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [TechMed 3D](https://appshunter.io/developer/964196047) | [warmwinds software](https://appshunter.io/developer/360264313) |

## What reviewers say

### Sole Dynamix

[App page](https://appshunter.io/ios/app/sole-dynamix/id6444317946)

**Features:** macOS Compatibility

**In-app purchases:** none


### SprintStart

[App page](https://appshunter.io/ios/app/sprintstart/id6451347398)

This app helps athletes train their sprint and race starts. It uses your iPhone and Apple Watch to initiate starting sequences, record reaction times with device sensors, and sync data via iCloud. Track and share your performance with detailed analytics.

**Highlights:** Initiate starting sequences via app, Siri, or Apple Watch, Measure reaction time using device accelerometers, Record, sync, and share training sessions, Customizable intervals and starting tones, Export reaction times and heart rate data, Visualize reaction times with charts

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sole Dynamix free?

Sole Dynamix is free to download, with no in-app purchases.

### Is SprintStart free?

SprintStart costs $2.99, with no in-app purchases.

### Do Sole Dynamix or SprintStart have ads?

Neither Sole Dynamix nor SprintStart shows ads.

### Which is updated more often, Sole Dynamix or SprintStart?

Sole Dynamix ships an update every 3 months, and SprintStart every 4 months. Most recently, Sole Dynamix was updated on October 7, 2026 and SprintStart on October 8, 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.*