People have mentioned a few here, but I'd say that Haskell's current ecosystem is much more directed towards building infrastructure than user-facing apps. Inde

People have mentioned a few here, but I'd say that Haskell's current ecosystem is much more directed towards building infrastructure than user-facing apps. Indeed, most popular Haskell programs are command-line utilities rather than "applications" in the modern sense. Most companies that use Haskell also use it to make robust infrastructure rather than, say, user-facing apps or webpages. I think it's hard to find many modern applications (I.e. some software package with a UI) made in anything outside of a few choice languages like JS, C++, C#, or Swift.