Notes that link up and come back for review before you forget

Breef is a note-taking and study app. Write down what you learn, link ideas with [[double brackets]], and see everything you know as one map. Spaced reviews bring each note back before you forget it, and an exam date gets a whole course ready in time.
Record a lecture and Breef turns it into a tidy study note with the transcript underneath; drop in a PDF of slides and get linked notes; ask a question and get an answer from your own notes. Free forever; Pro is €6 a month for more.