Lumen turns your course material into a personal tutor that plans, teaches and reviews with you — adaptively, at the exact moment you're about to forget.
Students don't fail for lack of effort. They fail because the techniques they were taught — and the tools they use — fight against how memory actually works.
Highlighting and re-reading are the two least effective techniques in cognitive science — yet they remain the default for most students.
0% least effectiveCramming buys short-term recall and pays for it with long-term forgetting. By exam day, most of what was "learned" is already gone.
0h of memory, wastedReview happens at the wrong time — or never. Nobody schedules when to revisit what, so the forgetting curve wins.
0 reviews scheduledOne app that plans, teaches and reviews — applying the science of learning automatically, personalized to every student and every course.
The AI maps your material into an adaptive study plan, sequenced by difficulty, dependencies and your deadlines.
Explains each concept at your level — with examples, analogies and follow-up questions when you're stuck.
Spaced repetition schedules each review at the moment you're about to forget — the single highest-leverage move in learning.
Drop in PDFs, slides and notes. Lumen reads them all — no formatting, no manual setup.
The AI extracts concepts, connections and — crucially — the gaps in what you already know.
Adaptive quizzes and reviews fire at the optimal moment, and explanations come when you miss.
Every concept tracked — you always know exactly where you stand, not a vague sense of "behind".
Questions tune to your mastery — harder where you're strong, gentler where you're shaky.
Reviews land at the forgetting-curve sweet spot — spaced repetition without any effort.
Import from Canvas, Moodle or any PDF — Lumen adapts to your syllabus, not the reverse.
The science is settled: active recall + spaced repetition beat re-reading by a wide margin. Lumen automates both, per concept, per student.
globally — and the number keeps climbing. English-language market alone: 40M+ in the US & EU.
Students live on their phones and already pay for tools (streaming, notes apps, tutors). The category exists; the product doesn't.
EdTech is compounding — but incumbents are legacy content platforms, not adaptive learning engines.
Ex-growth lead at Duolingo. Took a learning product from 0 to 12M MAU. Studied cognitive science at Stanford.
ML engineer, 6 yrs at Google Brain. Built large-scale retrieval + personalization systems. PhD dropout, happily.
Product designer behind two top-50 education apps. Obsessed with the "2-minute daily habit" UX pattern.
| Capability | Lumen | Re-reading & notes | Flashcard apps | Human tutors |
|---|---|---|---|---|
| Adaptive study plan | ● | — | — | — |
| Explains concepts contextually | ● | — | — | ● |
| Spaced recall, automatic | ● | — | ◐ | — |
| Works from your course material | ● | ◐ | — | — |
| Price | $8/mo | free | $0–10/mo | $15–30/hr |
We're not building another flashcard app. We're building the study companion that applies the science of learning — automatically, for every student, everywhere.
lumen.app · [email protected] — prepared with Loom