Nothing — they’re the same thing! HiiKER has just one premium tier, PRO+ (sometimes shortened to Pro). It includes all premium features: OS, Harvey, EastWest and historical map collections, live location sharing, heatmaps, weather maps, and printable maps (https://hiiker.app/print-maps).

If you’ve subscribed but the website still shows you a “buy Pro” prompt (for example when printing a map), your browser session could be out of date — log out of the website and back in and it will recognise your subscription.

If you still can’t access PRO+ features, there may be a deeper issue with your subscription.