If you don't have the time, remote testing is fine. It seems a lot, but the amount of time it takes to vet, schedule, and run in-person is worth it the $30 per test. These tools are fine for general usability.

• TryMyUI - $300 for 10 tests

• UserBrain - $290 for 10 tests

• Usertesting.com - Arm & leg (there are like car dealers)

If you are validating an idea, in person is the way to go. I prefer using Zoom and just record the session because our users all over the US.