Turn any book into a course you'll actually remember

AI extracts key concepts from your books and teaches them back to you with spaced repetition.

1 Upload a PDF
2 AI builds your course
3 Study 15 min/day

Free to start. No credit card required.

How it works

Upload any PDF

Drop in a technical book, documentation, or any learning material. Processing takes a few minutes.

AI extracts key concepts

Claude AI identifies the important facts, organizes them into concept clusters, and generates quiz questions.

Study with spaced repetition

Review facts at scientifically-optimal intervals. Short daily sessions build lasting knowledge.

You read the book. Then you forgot it.

You finished a 400-page book last month. You highlighted passages, nodded along, maybe even took notes. Today, if someone asked you to explain the key ideas, you'd struggle. This isn't a discipline problem — it's how memory works.

90%
forgotten within 30 days
Ebbinghaus' forgetting curve, demonstrated repeatedly in cognitive science research

The knowledge is worth retaining. You just need a system that works with your memory instead of against it.

From 500 pages to a structured course in minutes

Here's what happens when you upload Designing Data-Intensive Applications. Every book has a different structure. Every course reflects that.

Designing Data-Intensive Applications

Martin Kleppmann · 142 facts extracted · 8 concept clusters

Ready to study
Distributed Systems Storage Engines Replication Consistency
Fact · Storage Engines

LSM-trees achieve high write throughput by buffering writes in a memtable and periodically flushing sorted runs to disk, using compaction to merge segments.

Fact · Replication

Leader-based replication sends all writes to a single leader node, which streams changes to followers. This simplifies consistency but creates a single point of failure.

Quiz Question

What trade-off do LSM-trees make compared to B-trees?

Faster reads, slower writes
Faster writes, slower reads
Lower storage, higher latency

Timed to how your brain actually learns

Spaced repetition, active recall, and mastery-based progression — the same principles behind the most effective tutoring ever studied.

Spaced Repetition

Review material at scientifically-optimal intervals. Each successful recall pushes the next review further out, building durable long-term memory with minimal effort.

Active Recall

Testing yourself is far more effective than re-reading. Restudium generates questions that force retrieval, strengthening the neural pathways to each concept.

Mastery Learning

Don't move on until you've truly learned. The system adapts to your pace, spending more time on concepts you find difficult and less on what you already know.

Knowledge retained after 30 days

Without review ~10%
With spaced repetition 90%+

Further reading

Why I built this

I kept buying technical books — DDIA, SICP, the classics — reading them cover to cover, and retaining almost nothing six months later. I'd look at my bookshelf and feel like a fraud. All those ideas, just gone.

The irony is that these books are incredible. They're vetted, structured, written by people who spent years distilling hard-won knowledge. The source material isn't the problem. We just never had a good system to make it stick.

"AI can extract the knowledge; spaced repetition can lock it in. Everyone deserves a course built from their own books."

I tried Anki. Making cards by hand for a 500-page book is a second job. We have much better tooling now. AI can extract the knowledge; spaced repetition can lock it in. Everyone deserves a course built from their own books, with an agent that adapts to how they learn.

That's what Restudium is — study, again. Your books, turned into courses, taught back to you at the right time.

Free while we build

Restudium is in early development. Right now, everything is free — upload books, study with spaced repetition, track your progress. No limits, no credit card.

What you get today

  • Upload any PDF — AI extracts key concepts and organizes them into a structured course
  • Spaced repetition study sessions timed to your memory
  • AI-generated questions that test real understanding
  • Progress tracking across all your courses

Pricing will come later as the product matures. Early users will always get the best deal.

Questions

How does the AI course creation work?

Upload a PDF and our AI analyzes the content to extract key facts, organize them into concept clusters, and generate quiz questions. Takes a few minutes for a typical book. Currently supports PDF files.

What makes spaced repetition effective?

Spaced repetition reviews information at increasing intervals, moving knowledge from short-term to long-term memory. The algorithm adapts to your performance — facts you struggle with appear more often.

How much time do I need each day?

About 15 minutes. Short, focused sessions work better than long cramming sessions. The system is designed around consistency over intensity.

Is it really free to start?

Yes. The free tier includes one course with full spaced repetition. Upgrade to Premium for unlimited course creation from your own PDFs.