BrowserStack

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Do not build this. You cannot own the device lab, and in some cases you legally cannot.

Old Safari versions run only on old macOS, which runs only on Apple hardware. Old Internet Explorer cannot be licensed for this purpose any more. A drawer of physical phones needs charging, updating and replacing. That is the product, and it is not software.

WHAT TO DO INSTEAD
- Keep it if you genuinely support old browsers, or if a customer's specific device produces a bug you cannot reproduce. That is exactly what it is for
- Cancel it if you are testing modern Chrome, Firefox and Safari, because you can do that locally for nothing

WHAT YOU CAN BUILD, AND SHOULD

STACK
- Playwright, which drives Chromium, Firefox and WebKit locally
- Docker for a consistent environment, in CI

WHAT TO COVER WITHOUT PAYING ANYBODY
- The three engines, at several viewport sizes, on every pull request. WebKit locally is not Safari on an iPhone, but it catches the great majority of what differs
- Real device emulation for touch, device pixel ratio and reduced motion — emulation, honestly labelled as such
- Visual regression against a baseline, rendered in one pinned container image so a diff means a real change rather than a font rendering differently
- Accessibility checks with an automated auditor on every page, which catches a third of real issues and costs nothing
- A cross-browser smoke test of the paths that matter: sign in, buy, submit. Ten tests that always run beat two hundred that are flaky

AND THE CHEAPEST TEST OF ALL
Look at your own analytics and find out which browsers your visitors actually use. Most teams testing against a wide matrix are protecting a fraction of a percent of their traffic, and the honest answer is often to drop support and say so.

THE ONE-LINE VERSION
Run the three engines locally for free. Pay only for the devices you cannot own and genuinely need.