TestFlight is designed for iOS platforms.
It is a free instrument for distributing programs among the project members wirelessly. It enables software developers to test up to 10 applications simultaneous.
The testers are invited to the project.
Upon receiving the invitation to join the project they should follow the link, download TestFlight from App Store and install it.
The developer can invite up to 1000 testers after passing Beta App Review that is meant to make sure that the application complies with App Store requirements.
The tool is considered to be the best solution for beta testing and is widely popular among software developers and testers.