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Select browsers and devices

Learn about the capabilities that you can use to run tests on a particular browser / OS.

Following are a list of capabilities which can you can use to specify which browser / OS / device combination you want to run your test on:

Capability Description Expected values
browserName Browser you want to test on Chrome, Firefox, IE, Safari, Edge, Opera
browserVersion Browser version you want to test By default, we run tests on latest stable version of specified browser. View the list of supported browser versions.

You can also use latest-beta, latest, latest - 1, latest - 2, etc., to test on the current beta release or latest n versions of the specified browser as you specify.
os OS you want to test on Windows, OS X
osVersion Version of the OS to test on Windows: XP, 7, 8, 8.1, 10 and 11

OS X: Snow Leopard, Lion, Mountain Lion, Mavericks, Yosemite, El Capitan, Sierra, High Sierra, Mojave, Catalina, Big Sur, Monterey, Ventura and Sonoma
deviceName Mobile or tablet to test on The device you want to test on. View the list of devices we support.

You can use these capabilities as shown in the following example:

Set platforms to test on

Select the browsers / devices you want to test under the platforms object.

Parallel thread #1
Parallel thread #2
Parallel thread #3

Sample script showing capability declarations for browser-OS combinations

browserstack.yml
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BrowserStack SDK is a plug-n-play solution that takes care of all the integration steps for you. Using the BrowserStack SDK is the recommended integration method for your project. To know more, visit the SDK core concepts page.

Following are a list of capabilities which can you can use to specify which browser / os / device combination you want to run your test on.

BrowserStack-specific capabilities (Desktop)

Here is the list of custom capabilities offered by BrowserStack to easily specify the required browser and OS on desktop.

Capability Description Expected values
browserName Browser you want to test on Chrome, Firefox, IE, Safari, Edge, Opera
browserVersion Browser version you want to test By default, we run tests on latest stable version of specified browser. View the list of supported browser versions.

You can also use latest-beta, latest, latest - 1, latest - 2, etc., to test on the current beta release or latest n versions of the specified browser as you specify.
os OS you want to test on Windows, OS X
osVersion Version of the OS to test on Windows: XP, 7, 8, 8.1, 10 and 11

OS X: Snow Leopard, Lion, Mountain Lion, Mavericks, Yosemite, El Capitan, Sierra, High Sierra, Mojave, Catalina, Big Sur, Monterey, Ventura and Sonoma

Sample script showing capability declarations for desktop browsers

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Capability Description Expected values
browser Browser you want to test on Chrome, Firefox, IE, Safari, Edge, Opera
browser_version Browser version you want to test By default, we run tests on latest stable version of specified browser. View the list of supported browser versions.

You can also use latest-beta, latest, latest - 1, latest - 2, etc., to test on the current beta release or latest n versions of the specified browser as you specify.
os OS you want to test on Windows, OS X
os_version Version of the OS to test on Windows: XP, 7, 8, 8.1, 10 and 11

OS X: Snow Leopard, Lion, Mountain Lion, Mavericks, Yosemite, El Capitan, Sierra, High Sierra, Mojave, Catalina, Big Sur, Monterey, Ventura and Sonoma

Sample script showing capability declarations for desktop browsers

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BrowserStack-specific capabilities (Mobile)

Here is the list of custom capabilities offered by BrowserStack to easily specify the required device and OS version in mobile. Note that you will need to be on the Automate Mobile plan to be able to run tests on mobile and tablet devices.

Capability Description Expected values
deviceName Mobile or tablet to test on The device you want to test on. View the list of devices we support.
osVersion Version of the OS to test on Check the OS versions available for the specified device

Sample script showing capability declarations for mobile devices

MutableCapabilities capabilities = new MutableCapabilities();
HashMap<String, Object> browserstackOptions = new HashMap<String, Object>();
browserstackOptions.put("osVersion", "14");
browserstackOptions.put("deviceName", "iPhone 12");
browserstackOptions.put("realMobile", "true");
capabilities.setCapability("bstack:options", browserstackOptions);
var capabilities = {
	'bstack:options' : {
		"osVersion" : "14",
		"deviceName" : "iPhone 12",
		"realMobile" : "true",
	},
	"browserName" : "safari",
}
// for android
ChromeOptions capabilities = new ChromeOptions();
Dictionary<string, object> browserstackOptions = new Dictionary<string, object>();
browserstackOptions.Add("osVersion", "10.0");
browserstackOptions.Add("deviceName", "Samsung Galaxy S20");
browserstackOptions.Add("realMobile", "true");
capabilities.AddAdditionalOption("bstack:options", browserstackOptions);

// for iPhone
SafariOptions capabilities = new SafariOptions();
Dictionary<string, object> browserstackOptions = new Dictionary<string, object>();
browserstackOptions.Add("osVersion", "14");
browserstackOptions.Add("deviceName", "iPhone 12");
browserstackOptions.Add("realMobile", "true");
capabilities.AddAdditionalOption("bstack:options", browserstackOptions);
$caps = array(
	'bstack:options' => array(
		"osVersion" => "14",
		"deviceName" => "iPhone 12",
		"realMobile" => "true",
	),
)
desired_cap = {
	'bstack:options' : {
		"osVersion" : "14",
		"deviceName" : "iPhone 12",
		"realMobile" : "true",
	},
}
capabilities = {
	'bstack:options' => {
		"osVersion" => "14",
		"deviceName" => "iPhone 12",
		"realMobile" => "true",
	},
}
Capability Description Expected values
device Mobile or tablet to test on The device you want to test on. View the list of devices we support.
os_version Version of the OS to test on Check the OS versions available for the specified device

Sample script showing capability declarations for mobile devices

DesiredCapabilities caps = new DesiredCapabilities();
caps.setCapability("os_version", "11.0");  // select "14" for iOS 14
caps.setCapability("device", "Samsung Galaxy S20");  // choose "iPhone 12 Pro" etc.
caps.setCapability("real_mobile", "true");
var capabilities = {
  "os_version" : "11.0",  // select "14" for iOS 14
  "device" : "Samsung Galaxy S20",  // choose "iPhone 12 Pro" etc.
  "real_mobile" : "true",
  "browserName" : "Android"
}
// for android
ChromeOptions capability = new ChromeOptions();
capability.AddAdditionalCapability("os_version", "11.0", true);
capability.AddAdditionalCapability("device", "Samsung Galaxy S20", true);
capability.AddAdditionalCapability("real_mobile", "true", true);

// for iPhone
SafariOptions capability = new SafariOptions();
capability.AddAdditionalCapability("os_version", "14");
capability.AddAdditionalCapability("device", "iPhone 12 Pro Max");
capability.AddAdditionalCapability("real_mobile", "true");
$caps = array(
  "os_version" => "11.0",  // select "14" for iOS 14
  "device" => "Samsung Galaxy S20",  // choose "iPhone 12 Pro" etc.
  "real_mobile" => "true"
)
desired_cap = {
"os_version" : "11.0",  # select "14" for iOS 14
"device" : "Samsung Galaxy S20",  # choose "iPhone 12 Pro" etc.
"real_mobile" : "true"
}
caps = Selenium::WebDriver::Remote::Capabilities.new
caps["os_version"] = "11.0"  # select "14" for iOS 14
caps["device"] = "Samsung Galaxy S20"  # choose "iPhone 12 Pro" etc.
caps["real_mobile"] = "true"

Capability rules

The following set of rules are defined to help you overcome the capabilities conflicts while specifing which browser / OS / device combination you want to run your tests on.

  • os_version can only be defined when os has been defined.
  • The value ANY if given to any capability that supports that value is same as the capability preference not specified.
  • Default browser is Chrome on desktop when no browser is passed by the user or the selenium API (implicitly).
  • If browser and browserName are both defined, browser has precedence (except if browserName is either android, iphone, or ipad, in which case browser is ignored and the default browser on those devices is selected).
  • If browser_version and version are both defined, browser_version has precedence.
  • If os and platform are both defined, os has precedence.
  • os_version can only be defined when os has been defined.
  • platform and os_version cannot be defined together, if os has not been defined.
  • The value ANY if given to any capability that supports that value is same as the capability preference not specified.
  • Default browser is Chrome on desktop when no browser is passed by the user or the selenium API (implicitly).
By the way, did you know?

You can optimize your web apps for your mobile users by testing them on mobile devices. Run automated mobile browser tests using BrowserStack Automate.

Why test on mobile browsers?

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