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Kesto Swim

A training app that reads your stroke from a wrist sensor.

Client
Kesto Swim
Year
2025
Services
Product strategy, product design, iOS and watch apps, stroke data model
Studio
Sydney, with Amsterdam
Swimmer mid butterfly stroke in a blue pool

The brief

Kesto's wrist sensor could read a swimmer's stroke. Its app only showed lap times. Swimmers wanted to know what to fix.

Swimmer breaking the surface mid stroke
Wide frames from the pool-side test in week two.

What we did

We came to the pitch with a working prototype and tested it in a pool in week two. Everything is built for wet hands and a two-second glance: one number per screen, large targets, haptic cues underwater. A stroke model turns raw motion into three plain corrections after every session.

  • Pool-side prototype in 10 days
  • Stroke model and coaching cues
  • iOS and watch apps
  • Design system for the Kesto range
Close view of a swimmer's head and shoulders in the water
The data model starts with what a swimmer can feel.
Pool surface with splashes and light
Water, light and nothing else on screen.

What changed

2.1Mactive swimmers within six months
+52%more sessions per week
4.8/5average App Store rating
Two engineers reviewing code at a desk
They came to the pitch with a working prototype. Six months later it was in the hands of two million swimmers.
Ines VargaChief Product Officer, Kesto Swim

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