SwimStart
Swim start reaction trainer
$2.99 · Designed for iPad. Not verified for macOS.
Every 0.01s counts off the blocks. Practice your start reaction with the real command and random waits. Touch & motion modes,false-start detection. iPhone & Apple Watch.
SwimStart is a training app built specifically to sharpen your reaction time off the blocks in competitive swimming. Practice that split second between the starter's
command and your launch, over and over, in a realistic race-like setting.
■ Starts are won by reaction
In swimming, a fraction of a second at the start can change the entire result. And reaction speed isn't a gift you're born with — it's a skill that improves with the
right practice. SwimStart recreates the real race flow: the "Take your marks" command, the tense silence as you hold your set position, and the sudden start sound. It
measures your reaction to 1/100th of a second. Seeing your number every time makes progress tangible and keeps you motivated.
■ A realistic start experience
- "Take your marks" voice command
Press START and hear the command in English, just like a real race, so your body learns the rhythm from the call to the sound.
- Random or fixed wait time
Choose how long the app waits after the command before the start sound — a different time every round ("Random") or a consistent one ("Fixed"). Random mode recreates
the real "you never know when it'll fire" tension and breaks the habit of guessing the start.
- Adjustable countdown
Set a countdown before the command begins, giving you time to get into your set position.
■ Two measurement modes
- Touch mode
Tap the screen the instant the start sound plays. Quick and simple.
- Motion mode
Place the device on a stand or wear it, and the accelerometer detects the moment you move at the start sound — closer to your real starting action.
■ False-start detection
Turn on false-start detection and any reaction before the start sound is flagged as a "False Start," with a buzzer to let you know. Train your timing under real race-like
pressure. Prefer to focus purely on reaction without worrying about jumping early? Just turn it off.
■ See your progress
Results are saved automatically. Review your best time, average, false-start count, total attempts, and a history of every single try. Looking back at the numbers helps
you understand your form and track your improvement over time.
■ Works on Apple Watch, too
Beyond iPhone and iPad, you can practice on Apple Watch on its own. Wear it on your wrist and measure your reaction from the set position straight through the start sound
— perfect for poolside or dryland training with nothing but your Watch. The screen stays on during practice, so measurement never cuts out while you hold your stance.
■ Who it's for
- Competitive swimmers who want a faster start
- Junior swimmers practicing starts on their own
- Coaches who want their athletes to drill starts
- Anyone training their reflexes
Make every start faster and more precise. Win that first instant with SwimStart.
* "Take your marks" is kept in English in both text and audio, as it is the official race command.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yoshiaki Hirokawa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshiaki Hirokawa
- Size
- 6.3 MB
- Category
- Sports
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Netflowers Inc.
