SwimStart: Reaction TrainerSwimStart: Reaction Trainer
The race is won before you hit the water. SwimStart measures the time between the beep and your takeoff, so you can shave it down rep after rep.
Download on the App StoreFeatures
The Real Start Sequence
Countdown, the "Take your marks" command, then the start tone. The gap after the command is randomized every single time, so you can never memorize the timing and guess it. Move too soon and it goes down as a false start.
Timed to the Millisecond
Reaction time is measured with a monotonic clock, so it never drifts with your device's date and time settings. Today's number lines up directly against the one you posted six months ago.
Watch Your Numbers Improve
Every rep 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 right there at a glance, with your full history in a single list.
Tuned to Your Practice
Turn the spoken "Take your marks" command on or off. Set the length of the countdown and the range of the random delay before the tone.
Touch or Motion Detection
Tap the screen to react, or set the device on the starting block and let motion detection catch your movement. Train in whichever form is closest to your real takeoff.
Works on Apple Watch Alone
It's a standalone Apple Watch app, so your iPhone can stay in your bag. Practice, records, and settings all live on your wrist. The signal comes through as haptics as well as sound, so you'll feel it even when the noise on the pool deck swallows the tone.
No Account, Everything Stays on Your Device
No sign-up, no login. Install it and take your first rep immediately. Your records are stored 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 like at a meet
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 bag
• Practice, 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.