What are some alternatives?
When comparing Heya and Questo | City Exploration Games, you can also consider the following products
World Brush - AR app where you paint on the real world for others to find
Adventurous - Pokemon Go for families
dropdrop - Leave messages where you travel for others to discover
Run an Empire - Turn runs into adventures
TapTag - Leave photos for other people to find
Scavenger - An augmented reality scavenger hunt for cash prizes