What is crowdsourced testing?
Crowdsourced testing, also known as crowd test or crowd QA, is an approach to software testing where a large group of individuals, often referred to as the "crowd," are invited to participate in the testing process. Instead of relying solely on an internal team of testers, crowdsourced testing leverages the diverse skills and perspectives of a distributed community of testers.
In crowdsourced testing, the testing tasks and objectives are shared with the crowd, who then independently perform the testing on various devices, platforms, and configurations. Testers may be located anywhere in the world and may have different backgrounds and levels of expertise. They typically receive guidelines, test cases, and access to the software or application under test, and they report back their findings, bugs, and feedback to the testing organization.

Who’s involved in crowdtesting?
Crowd test involves a large number of testers based in different locations, which has advantages like 24/7 availability and demographic controls. With a broader set of people conducting tests in a diverse range of conditions, crowdtesting becomes a more robust testing approach capable of surfacing bugs in specific countries and locations.
Crowd testers are not a replacement for in-house QA teams. A good crowd test provider will still require the product and business knowledge that an in-house individual can provide, and find structures to help convey that information to individual testers. (GAT provides a technical project manager which stays with your account, for example.) Crowd test companies such as Global App Testing will act as project managers for a team of crowd testers on behalf of your organization. They can also match professional testers to your key demographic, to get relevant user feedback throughout the product life cycle.