Get the app
Kata on iPhone, Apple Watch, Android and the web. Sign in with the same account and everything you set up comes along.
Install Kata from the App Store on your iPhone. The Apple Watch app comes with it: if it doesn’t appear on your watch, open the Watch app on your iPhone and install Kata there. See Apple Watch and widgets.
Install Kata from Google Play on a phone with Android 8.0 or newer. See Kata on Android.
Open app.yourkata.com in your browser and sign in. The web app is the same Kata, with a wider layout and a rail on the left.
What you log lives on the device you log it on. To bring it to another one, see A new phone or computer.