In summary, Bootstrap isn't dead. Millions of developers use it. 40,000+ companies use it. It had a major facelift in 2020.
Is Bootstrap still relevant 2020?
With the rise of JavaScript front-end frameworks and an ever-changing landscape of technology and tools, a lot of folks are out there asking if Bootstrap is still relevant in 2021. The short answer is yes.
Is Bootstrap still used in 2021?
And, ten years on, it still does. According to Wappalyser, there are nearly 3.5 million websites out there that still rely on Bootstrap. The site reports that even the big boys like paypal.com, etsy.com, and gitlab.com use it. There's nothing wrong with it, in many cases.