FindBetaTesters…

Beta testers for Android apps

Android betas can use Play open testing, email lists or direct APK links depending on the community. The sources here skew toward places that welcome mobile builders — read the self-promo notes before you post.

FAQ

Play open testing or closed track?
Closed tracks work for a small trusted group; open testing scales faster. Tell testers which option you use and what to click.
Can I share an APK link?
Only where the community allows it. Some subreddits ban APKs; tester platforms often expect a Play link instead.