Free tools
Calculators for walkers and runners.
Small, honest tools that do one thing well. No sign-up, no adverts, and nothing you type is stored or sent anywhere. Each one shows its working and links to the research behind it, because a number you cannot check is not much use.
Why these are free
Step Step is a calm, ad-free step tracker for iPhone, built by a husband and wife team. These calculators use the same maths the app runs on your own workouts. If they are useful, the app does the same job continuously, reading from Apple Health, with everything staying on your phone. Either way there are no adverts and nothing to sign up for.