You have half an hour, yesterday's notes and a chapter that still feels slippery. A useful study setup has three jobs: make the material understandable, recall it without peeking, and give the session an ending. These apps cover different parts of that small loop.
“Must-have” means a shortlist for a study session, not a universal ranking or a requirement to run three apps at once. Start with the job that is currently missing. A notebook cannot answer a flashcard for you, and a timer cannot tell you whether you understood the page.
Goodnotes: explain the page
Goodnotes is a candidate when the material becomes clearer through handwriting, diagrams and marked-up PDFs. The official listing describes that mix of notebook and document tools. Our fit is a page you can return to and explain in your own words, rather than an ever-larger archive of untouched lecture files.
The current pricing page offers a limited free tier and paid plans. Match the notebook and import limits to your actual course materials before subscribing. The Goodnotes review also examines exports and platform differences. If the finished page must reach a classmate, choose the handoff before you build the whole semester around the app.
A useful page has a question at the top: what do I need to understand here? Add a diagram or a short explanation that addresses it. Collecting another PDF is easy; making one idea findable is the work.
AnkiMobile: recall a small thing
AnkiMobile Flashcards is the candidate when an idea needs repeated recall. Its study-screen guide describes revealing an answer and choosing a rating that determines the next review interval. That makes the quality of the prompt and the honesty of the rating part of the workflow.
