Calcpace, on your phone
Install it like an app, pick a time without hunting for colons, and turn any run you see into a race prediction with one tap.
Today was a phone day. Everything below came from using the site on one and writing down what got in the way.
It installs
Calcpace goes on your home screen now — its own icon, its own name, opening full screen with no browser bar. No app store, no download, nothing to update.
On Android a small bar offers an Install button that opens Chrome's own dialog. On an iPhone there is no such button to offer — Safari never built one — so the bar shows the two taps instead: Share, then Add to Home Screen. It stays out of the way: never on a computer, never once you have installed it, and not for two months after you say "not now".
Times you pick instead of type
Every field that asks for a time used to want HH:MM:SS typed out, colons and all. On a phone keyboard the colon lives one layer down, which is a strange thing to ask of a running site.
Those fields are now three wheels — hours, minutes, seconds — the ones your phone already knows how to spin. The pace fields get two, because a pace has no hours in it. Leave them alone and they stay empty; nothing gets filled in on your behalf.
Any run, one tap from an answer
At the foot of every run — yours, or one a friend sent you — there is now a row of shortcuts. Tap one and the calculator opens with that run already in it: what it projects for a half marathon or a marathon, what it says about your VO2max, how heat and altitude change the reading.
They only offer what the run can honestly support. A run gets predictions for races longer than it, never shorter — projecting a half from a 30K would be telling you what you already know. And a run that is not close to a standard race distance gets no race predictions at all, rather than being rounded into a 10K it was not.
Smaller things you might notice
The route map draws when you arrive at a run by tapping a link, not only after a reload. Signed in, the menu opens on your training and the button to log more, instead of five public tools you already know are there. The calculator's fields stack in one column on a narrow screen, so they stop looking crooked. And the back link on a run no longer hides underneath the share button.
