Running pace, translated for the day you're actually in.

What it does

• Today's paceYour planned session, translated into the conditions you're actually running in. Temperature, dew point, wind, elevation, altitude.
• Anywhere on earthCompare today against ideal conditions, your goal race, or any city you're travelling to.
• Race dayThe pace you want against the pace the course and forecast actually support — with mile-by-mile splits and fuelling that scales with the heat.
• It learns youConnect Strava and Meridian works out how you respond to heat, not how the average runner does. Until it knows, it says so.

Why not a free calculator?

Because the average runner isn't you.

Two runners of identical fitness can lose two minutes or six over the same hot marathon. An average can't tell you which one you are.

Your own history can. That's the one thing a web form will never have.

Who's building it

A runner in West Palm Beach, which is a stupid place to train for a marathon.

I spent a summer watching my paces fall apart, unable to tell whether I was losing fitness or just running in soup. Nothing I found answered that honestly.

So I started building the thing I wanted. First real test is New York, 1 November. — Max

Built honestly

A range, not a false decimal.

It tells you which conditions are driving the adjustment, and it says modeled until your history has earned it the right to say personalized.

Not a training plan. Not a social feed. Not another dashboard. One number, one sentence, out the door.