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Plans, payment, and the customer portal, all hosted off-site. You leave this page to pay or to manage a card; we never see the numbers on it.

Plans

Free
Current
Always free
  • The full learning loopAsk, Theory, Practice, Interrogate the flaw, Feynman, Grill
  • Theory at beginner and practitioner depth
  • 80 credits per monthUp to 10 a day on the house models: we cover the inference. One credit is one question on the fast model; stronger models cost more
  • Reviews just before you forgetSpaced repetition scheduled for you, synced across devices
  • 1 new course per monthand 1 minute of voice dictation in Feynman and new courses
  • 10 saved sessionsEvery item kept 30 days after you last use it
Your plan
Pro
Most popular
$12/mo
  • Everything in Free, plus:
  • Stronger modelsGPT, DeepSeek, Qwen, GLM and MiniMax, each priced on screen before you send
  • Deeper reasoningThe reasoning dial past medium, as far as the model goes
  • PhD depthFormal definitions and theorems in LaTeX, cited sources, a proof on each statement
  • Briefed exam papersA full paper written from your brief: style, duration, number of exercises
  • Code exercisesWrite Python in the exercise card and run it against tests in your browser, with hints and a code review.
  • Several sources with citationsGround a course in your own documents. Each chapter cites the passage it drew on, and a citation opens it beside the course.
  • The quick checkA few questions on what a course takes as known. It ends in suggestions, and nothing changes until you press.
  • Document importYour PDFs, photos and pasted text: 200 OCR pages per month, PDFs up to 20 MB and 100 pages
  • 7,000 credits per monthUp to 700 a day
  • 10 new courses per monthand 120 minutes of voice dictation in Feynman and new courses
  • Unlimited history1,000 saved sessions, notes and highlights synced across devices
Max
$24/mo
  • Everything in Pro, plus:
  • The frontier modelsOpen only on Max: Kimi, the largest Qwen and DeepSeek Pro
  • 30,000 credits per monthUp to 3,000 a day, 4.3x what Pro gets
  • 50 new courses per monthand 360 minutes of voice dictation in Feynman and new courses
  • 100,000 saved sessions
  • Bigger imports800 OCR pages per month, PDFs up to 50 MB and 400 pages

Already on a plan?

Change your card, switch plans, or cancel, all on the hosted customer portal.