The problem
Fifty minutes of talking. Three slides that actually matter. Somewhere in the transcript are the four phrases that carry the exam — and you're meant to find them by re-reading everything.
How it works
Nocturne extracts text from every slide and generates a Synthetic Study Guide automatically. Likely Zone keywords appear immediately.
Whisper transcribes your audio in-browser. The silence-gap engine syncs each word to its slide, measuring dwell time per topic.
Cross-reference your study guide against what the professor emphasized. Red Zone keywords are scored, hot-linked, and exported.
The Red Zone, live
Add what you have, and Nocturne sharpens its read. Step through a real lecture moment below.
What's inside
Why it's different
Otter, Notion, and Turbo hand you notes and flashcards to grind through. Nocturne tells you which terms matter — ranked by how likely each one is to be on the exam.
Zero-knowledge architecture
Nocturne's encryption isn't a marketing claim — it's a structural constraint. Your vault passphrase derives the key that wraps your Master Key, and that passphrase never leaves your browser.
Loved by students
From the beta cohort using Nocturne to walk into midterms already knowing what to study.
"Nocturne flagged three terms my professor kept circling back to — all three were on the midterm. I stopped re-reading everything."
"I used to transcribe lectures and never look back. The Red Zone ranking is the part Otter never gave me — it tells me where to actually spend my time."
"The fact that my audio never leaves my laptop is what sold me. The exam-likelihood scores are what kept me through finals."
Used by students across the UC, CSU & California private systems
Pricing
The complete core pipeline is free. Paid tiers add sharper ASR and more storage — never access to the basics.
Billed annually · three months free vs. paying monthly
The full core product.
Start for freeSharper transcription. More storage.
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