I usually map myself a route with Google maps before I ride. Mainly to track my distance and time so I can figure my average riding speed to track my progress. But when I use my app on my phone to track myself for that ride, its very different from what Google maps is saying distance wise.

What app do you recommend using that you have found accurate? Or should I trust in Google maps and forget out the app.

Ps. Unfortunately I can not get a computer for the bike right now. So that's out of the question.