# SprintStart vs JAWKU

The clearest difference is rating: JAWKU at 4.0 against SprintStart's 3.3. JAWKU also leads on update cadence (every 2 months vs every 19 months) and ratings volume (244 vs 3). SprintStart's advantage is iOS requirement (7.0 vs 15.6). On price, review sentiment, 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.

JAWKU holds the better App Store score, 4.0 against 3.3. That said, the two scores are not equally well evidenced: JAWKU has 244 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 67% of SprintStart's written reviews are positive against 68% of JAWKU's.

SprintStart ships an update every 19 months, JAWKU every 2 months. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SprintStart | JAWKU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (3 ratings)](https://appshunter.io/ios/app/sprintstart-reaction-time/id530460330/reviews) | **[4.0 (244 ratings)](https://appshunter.io/ios/app/jawku/id1184083672/reviews)** |
| Number of ratings | 3 | **244** |
| Positive reviews | 66.7% of reviews | **67.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 1 MB | 31 MB |
| Requires iOS | **7.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sten Kaiser](https://appshunter.io/developer/309325742) | [Brian Frohlich](https://appshunter.io/developer/1529541549) |

## What reviewers say

### SprintStart

[App page](https://appshunter.io/ios/app/sprintstart-reaction-time/id530460330)

Train for sprint starts and measure your reaction time. This app provides audio cues and a visual timer to record the interval between the starting signal and your movement.

**Highlights:** Practice sprint starts, Test reaction time, Audio start commands, Visual timer, Adjustable command-to-shot delay

**Features:** Vision Pro support

**In-app purchases:** none


### JAWKU

[App page](https://appshunter.io/ios/app/jawku/id1184083672)

This app measures athletic performance metrics like speed, agility, and reaction time with a wearable sensor. It allows athletes to track progress, visualize improvements, and access training content to enhance their performance.

**Highlights:** Measure sprint speed, Measure agility drills, Measure vertical jump height, Measure reaction time, Track performance history, Visualize personal records, Access training content

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Portable and easy to set up
- 📊 Accurate timing comparable to expensive laser gates
- 💰 Cost-effective alternative to multi-thousand dollar systems
- 📱 Requires only phone and sensor
- 🎯 Versatile for multiple drill types (40yd dash, 5-10-5, vertical jump)

**What reviewers complain about**

- 🐛 Unreliable recording of times
- 📡 Bluetooth connectivity issues at longer ranges
- ❌ Fails on distances beyond 40 yards
- 🚫 Interference from people walking in front of camera
- ⚙️ Clunky and unintuitive interface

**Reported bugs**

- Sensor disconnects at longer ranges (100+ meters)
- Times not recorded despite successful setup
- Audible mode not working on iPhone 13
- Jump clip registration fails
- Device won't charge or pair

**Requested features**

- Multi-athlete simultaneous timing capability
- Continuous video recording with manual time selection
- Better documentation and instructional videos
- Improved app updates and maintenance
- Better Bluetooth range extension


## Frequently asked questions

### Is SprintStart free?

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

### Is JAWKU free?

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

### Which has better reviews, SprintStart or JAWKU?

JAWKU is rated higher. SprintStart averages 3.3 out of 5 from 3 ratings, while JAWKU averages 4.0 from 244 ratings.

### Do SprintStart or JAWKU have ads?

Neither SprintStart nor JAWKU shows ads.

### Which is updated more often, SprintStart or JAWKU?

SprintStart ships an update every 19 months, and JAWKU every 2 months. Most recently, SprintStart was updated on October 6, 2026 and JAWKU on October 13, 2026.

---

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