Sole Dynamix vs SprintStart
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Sole Dynamix
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This app uses the Structure SDK / TrueDepth camera for 3D scanning. Supported device list (updated regularly): https://techmed3d.zohodesk.com/portal/en/kb/articles/minimun-device-requirements Complete your custom foot orthotics order by obtaining 3D scans of your feet with the Sole Dynamix app.
SprintStart
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.
- 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
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SprintStart for Sprint Block Performance is the leading tool for your sprint and race start training. Using our sprinting start optimized app, your iPhone and Apple Watch can call the starting sequence and start your race. Record, sync, and share your start training sessions. WIth our reaction time measurement, your response to the starting sound helps you track your performance out of the blocks and off the line. Using your device's acceleration sensors, your reaction time is recorded and displayed, and synchronized via iCloud to all your devices using SprintStart. Trigger a start from the app, from Siri, a shortcut, and your Apple Watch Ultra's Action button. SprintStart - Designed and built by a USATF Level 1 Coach and Masters-level sprint competitor, SprintStart has been track-tested from block, 3-point, and standing starts. You cannot get more convenient, or useful, than SprintStart. See you at the blocks! Features: - Clear voice calling of the starting sequence. - Customized intervals between start commands to model the race environment. - Start from the "bang" or a clear starting tone as your "go" sound. - Uses your device's accelerometer to detect reaction time to the "go" command - and adjustable sensitivity helps ensure you get accurate reaction measurements no matter which device or how you might be carrying or wearing it. - Optionally, display your reaction time at end of each start - your reaction time is always saved. - Export reaction times, dates, and heart rate (available on Apple Watch app) as a CSV to track your training performance over time. - Chart your reaction times for your sprint session right on your device - iPhone or Watch! - Synchronizes start & reaction information via iCloud, accessible on all your devices using SprintStart. - Apple Watch app uses haptic taps along with the voice commands. - Works GREAT with AirPods (especially the Watch app) - eliminate distractions and focus on your training!
Screenshots
Verdict
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.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
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.
| Parameter | Sole Dynamix | SprintStart |
|---|---|---|
| Price | Free โ better | $2.99 |
| Positive reviews | โ | 100.0% of reviews |
| Update frequency | Every 3 months โ better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | โ | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 129 MB | 3 MB |
| Age rating | 17+ | 4+ |
| Developer | TechMed 3D | warmwinds software |
In-app purchases
Sole Dynamix
No in-app purchases
SprintStart
No in-app purchases
Questions
Is Sole Dynamix free?
Is SprintStart free?
Do Sole Dynamix or SprintStart have ads?
Which is updated more often, Sole Dynamix or SprintStart?
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