This App shows the Tour du Mont Blanc route with all its variations.
On the free website TMBmap.com you can organize your self-guided TMB route:
Create your personal TMB route, plan accommodations and gain insight into distances, times and altitude profiles.

You can download your personal TMB route into this App and use it during your trip.
You will see your current location in relation to the route map and altitude profile.

Can be used with a smartphone in airplane mode!