... TestFi ( testfi.app ). AI made it a lot easier for one person to build and ship an app, and there are many more solo founders now because of it. User testing didn t keep up. UserTesting, the name everyone knows, sells annual contracts to companies with research teams. I wanted something a solo founder could buy one tester at a time. You paste a TestFlight link, an APK, a Play link or a URL and write what you want people ...