If you have tried to fill Google Play closed testing alone, you already know the trap. Paid farms promise numbers. What they rarely deliver is useful feedback—or peace of mind about policy risk.
Mutual testing flips the incentive. Someone who also needs testers has a reason to install carefully, leave honest notes, and stay for the retention window you actually need.
On TesterGround the loop is simple: join a live request first, finish Group → opt-in → install, then ask for a return test tied to your own recruitment post. The first seats can require a timely return; later seats stay voluntary.
You still do the hard work of building the app. The community helps you cross the closed-testing finish line without hiding the cost behind a sketchy invoice.