Polypane is a chromium-based browser that you install on your own device and use while building applications that lets you develop at different (emulated) devices and screensizes/variation in one overview, with a bunch of development, accessibility and quality tools built right in.
Browserstack is an online device testing tool where you check if your site works on different real devices one-by-one. That is to say, they don't really compete: if you don't have real devices to test with then Browserstack is an excellent option.
What users mostly find is that by using Polypane (fast, local) they have far less use of Browserstack (slow, online) and the entire process speeds up. There will always be a need for real device testing.
There's no gen AI integrations, and I don't have any planned. You can happily use Claude or CoPilot in the browse panel though (which is a little browser that lives inside Polypane, so you can browse without losing the context of your project)
Browserstack is an online device testing tool where you check if your site works on different real devices one-by-one. That is to say, they don't really compete: if you don't have real devices to test with then Browserstack is an excellent option.
What users mostly find is that by using Polypane (fast, local) they have far less use of Browserstack (slow, online) and the entire process speeds up. There will always be a need for real device testing.
There's no gen AI integrations, and I don't have any planned. You can happily use Claude or CoPilot in the browse panel though (which is a little browser that lives inside Polypane, so you can browse without losing the context of your project)