CrossBrowserTesting offers a cloud-based manual and automated browser test platform based on virtual machines running on real physical devices. It appears to be the only provider offering manual testing on physical iOS and Android (Nexus 5, 7, 9 and Galaxy S3, S4, S5 and Tab2) devices. Automated testing works uses Selenium and works on Android (physical devices) and iOS (simulators). Other features include recording videos, capturing network traffic, and taking screenshots.
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Pro Free manual testing for CodePen projects
Put your code on CodePen and you can manually test it with CBT from the "Choose a View menu".
Pro Automate browser *extension* testing
Can automate tests for Chrome and Firefox extensions using Selenium.
Pro Uses real browsers, not emulators
Pro Selenium testing
Pro Community / forum
Pro Record videos
Pro Screenshot comparisons
Automated screenshot comparisons report differences in layout. Manual side-by-side comparison also available.
Con Very slightly misleading Selenium examples / documentation
The Selenium WebDriver script examples, by default, don't explain what to put in
os_api_name. This leads to an
UnknownError: Invalid browser_api_name / os_api_name combination specified error, if you just copy and paste the script.
Instead, first select an OS and browser combination, and the script wizard will fill in the '?'s for you.
Con Can't change physical iOS device orientation
Con Typos in the documentation