When comparing Sauce Labs vs Endtest, the Slant community recommends Endtest for most people. In the question“What are the best cloud-based cross-browser testing services?” Endtest is ranked 3rd while Sauce Labs is ranked 6th. The most important reason people chose Endtest is:
Endtest allows you to create automated tests for web applications, directly on their cloud infrastructure. No coding skills are required. You can also choose the action "Execute Javascript" for a more flexible test run.
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Pros
Pro Huge variety of OSs, browsers and devices
There are over 300 desktop/mobile/tablet browser-platform combination possible.
Pro Test on Real Devices
Sauce bought Test Object and now offers automated and manual testing on real devices in public and private clouds.
Pro Selenium automation integration
Pro Integration with CI services

Pro VMs are destroyed after each session
No danger of data leaking to other users who might be using the VM, unlike with BrowserStack
Pro Codeless automated testing
Endtest allows you to create automated tests for web applications, directly on their cloud infrastructure. No coding skills are required.
You can also choose the action "Execute Javascript" for a more flexible test run.
Pro Running your automated tests on their cloud infrastructure
You can easily run your automated tests on their platform, just by clicking the run button.
Pro Designed for Continuous Integration
It has an API which allows testers to run it on Jenkins or Team City. Other than that, it has a built-in test scheduler to allow testers to preset test executions.
Pro Now supports mobile testing
Endtest has added a new feature which now supports mobile testing for both Android and iOS (.apk and .ipa).
Pro Option to export your automated tests in different formats, including .EXE
You can export your automated tests in a variety of different formats, and run them on your own infrastructure. The formats are either in Python file format or executable file format (.EXE).
Pro Now supports a wider variety of browsers, operating system and devices
As of March 2018, Endtest can now support multiple platforms (Windows, MAC, Android and iOS), Operating Systems, and more than a handful of devices for both Android and iOS.
Pro Super fast and affordable.
Pro Premium version is relatively cheaper than most in the market
Their pricing plan ($79/month or $650/year) includes team plan upgrade, which means the whole team, regardless of the number of users, will only need to subscribe to the $79/month or $650/year plan. This includes unlimited test runs, test exports, recordings, etc.
Pro It's mostly free to use
The free plan covers a lot, you can have up to 3 test suites, and you can run your automated tests as many times as you want. The pro plan includes some very advanced options that you might need only if you're working with a team (for example, the collaboration feature, schedule test run, API for Jenkins, etc.).
Cons
Con Very slow
Can take several minutes to start a VM, which is much worse than competitors
Con Graphical artifacts
Frequent screen tearing and other graphical artifacts make it harder to use.
Con Doesn't support a wide array of browsers and/or operating systems
Because it's still in its infancy, it doesn't yet have a huge variety of browsers and operating systems.
Con Free plan has limited time storage for test suites
If you are using the free plan, keep in mind that the test suites created there are scheduled to be deleted after around 2 weeks. Endtest will send you a notification email the day before mentioning "Test suites from users who are not on the PRO Plan get automatically deleted after some time," and offering for you to upgrade to PRO.
Con Codeless and locks you in rendering your efforts useless if you want to switch
Con Bad UI
