SwimStart: Reaction TrainerSwimStart: Reaction Trainer
The race is decided before you touch the water. SwimStart times the gap between the signal and your take-off, so you can trim it away rep by rep.
Download on the App StoreFeatures
The Same Sequence You'll Face
Countdown, the "Take your marks" command, then the start tone. The pause after the command is randomised every time, so there's no rhythm to memorise and anticipate. Go too early and it's logged as a false start.
Timed to the Millisecond
Reaction time is measured on a monotonic clock, so it isn't affected by your device's date and time settings. Today's figure sits directly alongside the one you recorded six months ago.
See the Progress in Numbers
Every attempt is saved with the date, the reaction time and whether it was a false start. Your best, your average and your false start count are visible at a glance, with the full history kept in one list.
Set Up Around Your Session
Switch the spoken "Take your marks" command on or off. Adjust the length of the countdown and the range of the random delay before the signal.
Touch or Motion Detection
Tap the screen to react, or rest the device on the starting block and let motion detection register the movement. Practise in whichever form sits closest to your real take-off.
Runs on Apple Watch on Its Own
It's a standalone Apple Watch app, so your iPhone can stay in your kit bag. Practice, records and settings all happen on your wrist. The cue arrives as a vibration as well as a sound, so you'll catch it even when a noisy poolside drowns the tone out.
No Account, Records Stay on Your Device
No registration, no login. Install it and take your first attempt straight away. Your records live on your device and nowhere else.
The race is decided before you touch the water. SwimStart is a start-reaction trainer for swimmers: rehearse the start off the blocks, measure how long it takes you to move after the signal, and drive that number down.
A REAL START SEQUENCE
• A countdown, then the "Take your marks" call, then the start tone
• The hold after the call is randomised, so you cannot memorise the timing
• Reaction time is measured on a monotonic clock, so your numbers compare fairly
• Move too early and it is flagged as a false start — exactly as at a gala
TRACK YOUR PROGRESS
• Every attempt is saved with its date, reaction time and false-start flag
• See your best time, your average and how many false starts you had
• Your full attempt history in one list
SET IT UP YOUR WAY
• Turn the spoken "Take your marks" cue on or off
• Set the countdown length and the range of the wait before the signal
• Choose touch or motion: tap the screen, or leave the device on a stand and move it
ALSO ON APPLE WATCH
• A standalone Apple Watch app — leave the phone in your kit bag
• Practise, records and settings straight from your wrist
• A haptic cue alongside the sound, which helps at a noisy poolside
SIMPLE AND PRIVATE
No account, no sign-up. Your records stay on your device.
SwimStart is a training aid. It measures your reaction to a signal from your phone or watch and does not replace official starting equipment or a competition timing system.