# Sprint Start Trainer vs NinjaButton

The clearest difference is in-app purchases: NinjaButton at none against Sprint Start Trainer's 1. NinjaButton also leads on ads (none vs shown) and iOS requirement (15.5 vs 18.0). On price and device support there is nothing between them.

Both are free to download. Sprint Start Trainer sells 1 one-off in-app purchase. NinjaButton asks for nothing beyond the download.

## The numbers

| Metric | Sprint Start Trainer | NinjaButton |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (16 ratings)](https://appshunter.io/ios/app/sprint-start-trainer/id6473805472/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 29 MB | 38 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Koki Osada](https://appshunter.io/developer/1501162473) | [CONCEPT PROTO Inc.](https://appshunter.io/developer/1552850971) |

## What reviewers say

### Sprint Start Trainer

[App page](https://appshunter.io/ios/app/sprint-start-trainer/id6473805472)

This app helps athletes practice sprint and swimming starts by measuring reaction time and reviewing technique using video. It offers various start signal sounds and timing modes to simulate real race conditions, turning your phone into a portable training tool.

**Highlights:** Video reaction time measurement, Technique review, Customizable start signal sounds, Fixed and randomized interval modes, Manual cue control, Automatic repeat starts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Upgrade | $4.99 | one-time |


### NinjaButton

[App page](https://appshunter.io/ios/app/ninjabutton/id6808265657)

**In-app purchases:** none


## Frequently asked questions

### Is Sprint Start Trainer free?

Sprint Start Trainer is free to download, with in-app purchases available.

### Is NinjaButton free?

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

### Do Sprint Start Trainer or NinjaButton have ads?

Sprint Start Trainer shows ads; NinjaButton does not.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*