Tap the Share button (the square with the up-arrow) at the bottom of Safari.
2
Scroll down and tap Add to Home Screen, then Add.
Android — Chrome
1
Tap the ⋮ menu (top-right).
2
Tap Install app or Add to Home screen.
Your logs are saved on this device only — they don't sync between phones, so you and your friend each keep your own data. Use Export CSV on the Compare tab to send results to compare.