BrowserStack

It is helping users to test their applications easily on multiple platforms,devices, browsers and their versions etc. Easy to integrate with Selenium/SpecFlow/Cucumber etc. It is less appropriate if scope of testing is only a single browser and also if application under test is desktop application.

It is well suited for automation, if it is mobile automation, even better, the variety of devices it huge. Also it is super convenient for manual tests on a abroad team, where sending physical devices is hard to, or complicated. Give access to BrowserStack and the whole team has access to a lot of devices, also it is easier to upgrade version of OS and hardware as well.

Main attraction is the multi platform, multiple screen size, multiple OS versions. All available in one place. That is not something anybody can offer. It helps to reduce the testing device initial cost

BrowserStack is great for any web app/marketing site that has to work seamlessly across every browser, screen size, device, and location. It gives you the tools to test your web applications in nearly every scenario possible, allowing you to fix issues easily and efficiently. It's been incredibly helpful in allowing us to test our site from different locations as well, by using the VPN services, we can test our site's speed and responsiveness across the globe, dealing with any specific locale nuances very easily.

BrowserStack is well-suited: Cross-browser compatibility testing, Mobile app testing, Automated testing, Parallel testing, Responsive design testing, Local testing, Continuous integration (CI) integration, Remote debugging, Geolocation testing, Network simulation, Scenarios where BrowserStack may be less appropriate: Performance testing,Comprehensive API testing, Extensive security testing, Test case management, Heavy load testing, Deep integration with specific development tools, Highly specialized, industry-specific testing needs.

As a developer, I could say use BrowserStack to check the applicaiton behaviour, appearance on various devices available in the market.
Also, one can find the older devices too, to use them for testing.

Well-suited Scenarios for BrowserStack:Cross-Browser Testing: BrowserStack is ideal for testing web applications across multiple browsers, including Chrome, Firefox, Safari, Edge, and various versions of these browser, Mobile App Testing, Automated testing, Geographic testing etc.
Difficult to test with limited internet access and with sensitive data and also the complex desktop applications are hard to test

Tests that do not interact with hardware or firmware and are exclusively cloud-based are excellent for BrowserStack testing. I'm not able to use BrowserStack for tests that rely on a Bluetooth connection to a separate piece of hardware, so I have to rely on a framework like Katalon that can give me a local Appium bridge to run tests on a tethered device. If BrowserStack can provide a SaaS solution to this problem, it would be a more attractive option to emerging IoT test automation needs.

It has a lot of options to choose from it is a good thing about BrowserStack, but sadly most of the devices are always acquired, which is disappointing. In case of performance, their devices are high end and really physical devices put on their data center perhaps. I would recommend BrowserStack if you have enough time to wait until the devices become available otherwise you search for alternative.

As a test automation lead/framework dev, I would highly recommend BrowserStack to team members, as it helped us rapidly build test scenarios for 500+ scenarios. Its support team is doing well and are available via chat or email. It also has new devices/os platforms available on daily basis.

BrowserStack has proven to be invaluable for my team and me. As we strive to deliver high-quality web applications, it serves as our go-to platform for multiple use cases. Firstly, its expansive range of browsers and platforms has simplified our cross-browser testing process immensely. No longer do we worry about our application's compatibility with various browsers. Secondly, BrowserStack's capabilities to test on real mobile devices are a lifesaver. It allows us to ensure our design is responsive and maintains its quality across different screen sizes, which is crucial in today's mobile-first era. Thirdly, BrowserStack compliments our mature testing process by offering scalable, cloud-based infrastructure for our automated tests. We use Selenium for functional tests, and BrowserStack provides a hassle-free environment to run these tests concurrently, saving us from maintaining our own device lab.

BrowserStack is great for designers and dev to test new products in UAT or prod. We typically do our testing in UAT before pushing to prod, so it's really handy to have something like BrowserStack so we can test on any device. We really enjoy being able to see our designs on multiple screen sizes.

BrowserStack being a remote test lab is well-suited for characteristics an End-User may experience out in the open world compared to being stuck at their desk connected to Wi-Fi 100% of the time. BrowserStack allows the Tester to take in more of the realistic ways their app will be experienced. Testing against remote/rural parts of the world instead of big city living. Allowing the device to get too low battery scenarios, or potentially overheating due to multiple conditions being weather or from overuse of several memory hogs being used at the same time. BrowserStack is perfect for the automation realm of testing due to the broad range of devices, OS, and versions it provides.

A couple of areas BrowserStack isn't as appropriate would be the limited options it has for interacting with devices such as multi-touch and gestures. Test scenarios that include sensors such as NFC/Bluetooth or battery consumption are often hard to test in the cloud.

BrowserStack products like Live, App Live & Automate to test our website on different devices browsers. And to test iOS App on different Apple devices and iOS versions. We run our selenium automation scripts against BrowserStack Automate. Overall we are pleased to have been using BrowserStack suite of products.

BrowserStack pricing structure seems its tailored more towards larger teams with multiple seats, it is expensive for a solo web developer to use for contracted clients. There are a lot of automation features as part of the lowest tier plan, but I never needed to use because my clients don't have sophisticated websites with e-commerce or logged in users.

Best Suited - helps developers and support teams interact with the mobile app during any stage of the development cycle, even if it is WAY earlier than what one would call an Alpha. Being able to see your app on a variety of devices (for support teams) who would otherwise not have access to that particular mobile device. Least Suited - Mobile device troubleshooting. The emulators do not have access to ALL of the phone's various settings, so a more complex troubleshooting issue that may affect a specific phone/model would be harder to support. You would have to rely on outdated screenshots, external websites, or possibly an employee who has that specific model of phone.

We use BrowserStack heavily for cross-browser and mobile testing. It helps us catch UI bugs on different devices. VPN services provided by BrowserStack is very useful. We use VPN services for checking compliance-related things in other countries. It also provides with screen recording option to capture the entire screen and share it with another team

It is really good to run several test cases concurrently, without having to think about the infrastructure. Sometimes you implement other technologies, as Selenium grid, but it is buggy and difficult to debug. It is easier to implement with BrowserStack

BrowserStack is well suited for both following scenarios:

• Test a web application, BrowserStack giving the option to use real mobile devices, and also real computer browsers, the user not needing to have at hand real devices, and relying on the large pool provided by BrowserStack at the distance of a click.
• Test mobile applications and install them on real mobile devices, being able to catch bugs easier and testing the application on a large pool of devices, which would be almost impossible to have that many devices at hand to test. Also, the Automation plans are a big plus, being able to test web-applications / native applications on multiple devices.

It's a great tool to test a website or web app in various environments you can not provide on-premises. It's quite expensive though. Note, however, that they have a free plan for open-source developers.

Suited for companies who want to automate iOS and Android test cases but can't afford to splurge on setting up the test environment. BrowserStack provides a readymade. Less Appropriate for companies who have budget constraints as BrowserStack comes at a premium; having said that, it will easily provide a huge return on investment test environment for them.

BrowserStack is great for organizations that need to test a wide variety of devices for their mobile app (test matrix) and ensure they are not breaking older versions of android or iOS. Form factors are also easy to come by with the size of their device farm. They also have plenty of each type of device, so your automation almost always runs on the selected configuration (unlike other device farms).

Ability to run parallel tests for automation also speeds up feedback loops but it does get costly. So if you have a lot of end to end tests, your jobs might take a long time.

Perfect for reviewing a site on different devices to make sure elements react properly to different screen sizes etc.
Great for bug finding due to the capture screen feature.
Great for debugging problems due to element inspectors.

Not good for demonstrating during a meeting since sessions time out (and if I can disable that, I don't know how.) Not good for UI/UX design because mobile inputs are not intuitively translated to mouse and keyboard controls.

Excellent application for almost all your cross-browser testing needs. There are plans suitable for most of the requirements. Visual testing is possible using percy, but it comes with it's own pros and cons. I love the way BrowserStack has come along all through these years and they have put in all effort to stay in the current. It would great if we could also select the browser version of a device - this is the only recommendation I have.

Any company offering solutions on mobiles, BrowserStack is the best option. Cost, speed, availability of devices, and device inventory are places where they are superior.