Saw a pop up for 50% off AllTrails+ one year sub. Confirmed working via online checkout on PC.
The subscription provides the following features over the free model:
Download offline maps
Get alerts for wrong turns
Preview 3D Flyovers
Find trails by distance from you
Unlock more map details
Print maps for backup
Bring trails to life with 3D maps
Explore ad free
Heard that if using Turkish apple id it is much cheaper :)