TestFi is a crowdtesting marketplace that connects app developers with verified human testers for real-device usability testing. Post a campaign with a TestFlight link, APK, or web URL, hand-pick testers from 2,000+ verified participants across 12+ countries, and receive screen recordings plus an AI-scored UX report within 24 hours. Pricing is pay-per-tester: $1.99 for written feedback, $3.99 for full screen-recording sessions no subscriptions, no minimums, no SDK required. Commonly used by indie developers and small teams to satisfy Google Play's 12-tester, 14-day closed testing requirement.