The maximum number of automated tests (e.g. Selenium, Javascript, API initiated) that can be run concurrently is determined by your subscription plan.  (See Pricing Table and Plans for details)

We understand the importance of running tests concurrently to optimize your continuous integration flow. A major advantage of our service is that we provide a combination of real operating systems and an extensive array of physical phones and tablets.

For desktop operating systems, the maximum number of automated tests per operating system is 20. If your plan allows 40 parallel automated tests, those tests would have to be spread across two different operating systems to run successfully for your team.

Automated tests on physical mobile devices and mobile simulators are limited to 5 per device. If your plan allows for 10 parallel automated tests, you would need to spread your tests across two different devices to run successfully for your team.

Spreading your tests across multiple operating systems and devices ensures the highest concurrency possible under your plan. Please note these limits are at the account level and all users running automated tests count towards these limits.