How Strolly works

After you complete the setup, you will see several options. When I tried the app in different locations, it usually suggested one 15-minute walk, one 30-minute walk, and one hour-long walk, with some variation. If you know you prefer shorter walks, you can adjust the settings to receive combinations of long, medium, and short walks.

You can switch between different randomly generated walks by flipping through the cards in the bottom-left corner. You can also tap and hold the cards to either pin a walk—saving it for later—or to wipe out the current walks and generate more.
There's also a feature that allows you to mark areas that aren't actually great for walking. This will train the application not to include such areas in the future. However, the information remains local to your device and is not uploaded to a server.
Overall, Strolly is a very simple app, but that's the point. Give it a shot next time you want to take a walk and don't know exactly where to go.