I would maybe check out Hiking project if your in North America. It looks really similar to all trails, except you have to download particular areas. The drawback is that the user input is almost nonexistent on smaller, local trails. More popular trails have some good info though. This definitely seems like it has promise.

Then theres Farout (formerly guthook) - I've heard this app mentioned alot as the preferred way to navigate trails like the AP or CDT. It costs money, and it's not cheap, but you can download the app and continue as a guest and check put some of the free maps they provide.