From any source to
lasting mastery.
ClassFactor turns your real study material into high-quality practice, then uses spaced repetition to make sure it sticks. Here's the whole loop.
The loop
Four steps, one continuous cycle
Each pass through the loop sharpens what you know and surfaces what you don't.
Add your material
Drop in a PDF, slide deck, lecture recording, YouTube link, or your own notes. ClassFactor reads it, extracts the key concepts, and maps them to topics.
- PDFs, slides, docs & webpages
- Audio & video with transcripts
- Paste notes or record live
Generate high-quality questions
ClassFactor writes multiple-choice, true/false, written, and case-based questions — plus image-occlusion cards from labeled diagrams — each grounded in your source with plausible distractors that actually test understanding.
- Flashcards, MCQ, written & case questions
- Plausible, exam-grade distractors
- An AI judge filters weak items before you see them
Study with spaced repetition
Every review is scheduled by FSRS — the modern successor to SM-2 — so cards return exactly when you are about to forget them. No wasted reps, no cramming.
- FSRS-6 scheduling
- Prioritizes your weakest recall
- A daily queue that fits your time
Track mastery & close gaps
Mastery analytics show exactly which topics are strong, which are slipping, and what to review next — with an AI tutor on call to explain anything you miss.
- Per-topic mastery tracking
- Weakest topics surfaced first
- AI explanations on every card
The science
Built on how memory actually works
ClassFactor isn't a prettier flashcard app — it's the learning science, automated.
Active recall
Retrieving an answer from memory builds far stronger pathways than re-reading. Every ClassFactor card is a retrieval rep.
Spaced repetition
FSRS predicts your forgetting curve per card and reviews each one at the optimal moment — maximum retention for minimum time.
Deliberate practice
Act, get feedback that pinpoints the gap, learn, repeat. The loop that turns effort into measurable mastery.
Active recall and spaced repetition are among the most consistently supported findings in learning science. ClassFactor’s job is simply to make them effortless — so you spend your energy learning, not scheduling.
Questions
How it works, answered
PDFs, PowerPoint and Google Slides, Word and Google Docs, webpages, YouTube videos, audio and video lectures, and plain notes you paste or record. ClassFactor extracts the text (and transcribes audio/video) before generating questions.
Writing good questions is slow, and self-made cards are often too easy. ClassFactor generates exam-grade questions with plausible distractors in seconds, then schedules them with FSRS so you review at the perfect time — the two hardest parts, automated.
Quality is our core focus. Each question is grounded in your source and passes a judge model that filters vague, duplicate, or trivially-easy items before they reach your deck. You can thumbs-down anything and it is removed and improved.
No. Just review the cards ClassFactor surfaces each day. FSRS handles all the scheduling in the background — you simply show up and study.
Start today. Multiply tomorrow.
Turn your notes into lasting mastery — one correct recall at a time. Free to start.