What Synapse does
Most study tools ask you to trust an answer that came from somewhere you cannot see. Synapse works the other way round. You give it the deck, the PDF or the notes your course actually runs on, and everything it produces is built from that.
Learns from what you upload
Upload a slide deck, a PDF, a Word document or plain notes. Synapse extracts the real text page by page, works out which pages are teaching content and which are titles, admin or references, and builds a structured version of the document it can teach from. Scanned pages and diagrams are read with a vision model so that an image-only slide is not simply skipped.
A tutor that stays on your syllabus
Ask a question and the tutor answers from the slide you are on, in the context of the deck around it. It knows which page you have reached and will not teach past it unless you ask, so revising week three does not spoil week nine. If your material does not contain the answer, it says so rather than inventing one.
Quizzes and flashcards written from your slides
Questions are generated from the material itself, then checked by code before you ever see them: every item must have a real question, a real answer and an explanation, multiple choice items must have four distinct options with the answer among them, and anything that echoes the prompt or leaks the instructions is thrown away and regenerated. You see the ones that passed.
Recall that is scheduled, not guessed
Cards you struggle with come back sooner and cards you know come back later, on a spaced repetition schedule. Quiz results feed the same picture, so the questions you get wrong shape what you are asked next rather than disappearing into a score.
A tutor that remembers you
Between sessions Synapse keeps a short, bounded record of what it has learned about teaching you: the explanations that landed, the topics you keep circling, whether you want the short version or the worked one. It is small on purpose and you can read it.
Speech, without sending your voice anywhere
Reading aloud and voice input both run inside your browser rather than on a server. Nothing you say is uploaded, and once the speech pack is downloaded it works offline.
Your material stays yours
Everything you study is stored in your browser, or in cloud storage you connect yourself with credentials only you can decrypt. It is not copied to our servers and we cannot read it. There is more detail in the privacy policy, and the reasoning behind the design is in about Synapse.