Record your trips — the countries you stayed in, the flights you took and what it cost. Your flights list is built from your trips, so there is nothing to enter twice.
Every airport and airline, counted — how often you’ve been through each airport and flown with each airline.
A globe that replays your flights — spin it, then watch every route drawn again in the order you flew it.
iCloud sync, no account — your data stays on your devices and in your own iCloud. Nothing to sign up for, and nobody else can read it.
Hikes and banknotes, if you want them — log your hikes, and collect a banknote from every currency. Both are optional.