Bear is a really powerful markdown editor, and we are big fans ourselves. However, you are tied down to the apple ecosystem, and it still relies on files / tags

Bear is a really powerful markdown editor, and we are big fans ourselves. However, you are tied down to the apple ecosystem, and it still relies on files / tags with no hierarchical organisation. Supernotes is entirely web-based and responsive, as you can log on and access your notes from any device. We are working on desktop and mobile apps at the moment! Similar to Bear Supernotes uses tags, but our note-cards are also nestable. For example, you can write a note-card with a brief summary on a book you are reading, and then add child note-cards which are quotes from that book. Once you have written a few cards you can filter by tags, connect cards together with bi-directional links and even add those child cards into other parent cards – we are the only PKM with a true multi-parent hierarchy!