Show HN: AI quizzes for your content – organised in memorable emoji lessons

This learning tool turns learning content* into an organised, curriculum-like quiz experience. It makes sensible lessons, containing quiz questions and motivating you with progress! You can usually see all lessons at a glance on one page[https://revision.ai/images/splash/lessons.png].

* a PDF (like a lecture slideshow), PPTX, Wiki page, or a Youtube video

- Each lesson has a topic-based emoji ()and shows a proportionate visual pie chart for your progress - There is a single "unlocking" path, with 2 teaser lessons, which always gives you one simple "Next Step" - And by viewing the overview, you can view a wall of Golded lessons to tell when you are nailing the recall-level understanding on the content.

The content/quiz questions are inspired by Active Recall (Roediger & Karpicke, 2006) and the Minimum Information Principle from Anki. And it's freemium with 2 free runs :) You can also highlight your PDFs for studying.

I built the lessons aspect with care, taking lessons from what hadn't worked before: a) using something visually and uniquely memorable for you - a unique emoji chosen by AI for each lesson! b) doing question generation -after- choosing sensible lessons, so questions are tailored to the PDF-specific lessons... c) making it a "one-way learning path" was to make learning easier: previous semantic(vector DB-like) maps of concepts/trees were unencouragingly overengineered!

Fun fact on the name - "Revision" means "to study for an exam" in a lot of places, like the UK... less Stalinist, you see.

I have future plans ofcourse! Now I'd love feedback and thoughts - so do get me started on preprocessing or the psychology of learning... Let me know your thoughts.