When you get hooked on SuperMemo and embrace the idea of incremental reading, it becomes the primary software on your computer. You end up spending more time in SM than you do in the browser. People use it not just to memorize flashcards, but to read articles and books... even to write and edit their own articles and books... track their sleep... plan and execute their daily schedule... keep track of tasks and priorities. It's a quirky piece of software but quite a mature one. After all, it has been in continuous development since the late eighties!

Oh there's a small but thriving community of SuperMemo users that sprang up recently. Here's a Youtube channel created by members of this community to help new users: https://www.youtube.com/channel/UCMdkN_8gHPn5vlYDe2ScrxQ