SprintStart vs JAWKU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SprintStart
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.
- Practice sprint starts
- Test reaction time
- Audio start commands
- Visual timer
- Adjustable command-to-shot delay
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Practice sprint starts and test your reaction time. Tap start, put the iPhone in your pocket or on the starting block. SprintStart will speak the start commands and play a shot. The display will give you the time from the shot to when you start moving. You can change the time from the 'Set' command to the shot.
JAWKU
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.
- Measure sprint speed
- Measure agility drills
- Measure vertical jump height
- Measure reaction time
- Track performance history
- Visualize personal records
- Access training content
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Get Quick. Get Fast. Get JAWKU Speed. This app requires a JAWKU Speed sensor. Numbers don’t lie. And JAWKU Speed provides the key performance data across speed, agility and reaction time, with unrivaled accuracy in wearable technology. We changed the game. We're still changing it. JAWKU Speed was intentionally designed with you, the athlete, as our primary focus. Providing a meaningful experience, supported with accurate data capture hasn't existed like this, until now. The best part - while JAWKU is in a class of it's own, it's as simple to use as a stopwatch. YOUR PERFORMANCE UNLEASHED The JAWKU Speed App brings the entire experience to life. And setting it up is simple! Out of the box, the app will walk you through pairing and in a matter of minutes, you'll be unleashing an experience unlike any other. It's all there to help you understand how you're tracking and making good on all of that training you've been committed to. Let's take a closer look at the main features. TEST + Measure sprint speed + Measure agility (standardized tests or build your own drill) + Measure vertical jump height (NEW) + Measure reaction time off the blocks (in audible mode) + Select your distance and start mode (movement or audible) and you're ready to go TRAIN + Train with purpose. From within the app, you'll have access to the latest in training content from our partner, STACK, where athletes get better TRACK + Track your performance history over time + Visualize your performance against your previous times and personal records + Learn how your reaction time off the blocks is affecting your overall time. Seeing is believing. MY JAWKU + Manage everything here + Check sensor connectivity + Adjust/update your personal profile and settings
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SprintStart | JAWKU |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (3 ratings) | 4.0 (244 ratings) — better |
| Positive reviews | 66.7% of reviews | 67.7% of reviews — better |
| Number of ratings | 3 | 244 — better |
| Update frequency | Every 19 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 7.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 1 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Sten Kaiser | Brian Frohlich |
Customer experience
SprintStart
JAWKU
Bugs and requests
SprintStart
Not enough reviews yet to summarise bugs or requests.
JAWKU
Reported bugs
10 issues- 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
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- App loading screens freeze after Bluetooth connection
- Sensor not detected despite proximity
- Timer stops before athlete finishes event
- Inconsistent performance across different iOS versions
- App hasn't been updated in multiple years
Requested features
8 requests- 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
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- Camera rotation functionality
- Offline functionality without internet requirement
- Better handling of crowded track environments
In-app purchases
SprintStart
No in-app purchases
JAWKU
No in-app purchases
