What are some alternatives?
When comparing Heya and Minecraft Earth, you can also consider the following products
World Brush - AR app where you paint on the real world for others to find
Get Peanutized - Turn yourself into a Peanuts character!
dropdrop - Leave messages where you travel for others to discover
Amazing Creatures - Summon creatures from another Realm and end The Rift.
TapTag - Leave photos for other people to find
Harry Potter: Wizards Unite - A Pokemon Go-style Harry Potter game by Niantic 🧙♂️