Built for STEM students

Not a note-taker.

A study intelligence system.

BETA v1.1

EchoGraph links your lecture audio, slides, and study guide — then tells you what your professor actually emphasized.

Start for free

Zero-knowledge encrypted · Runs in your browser · Free tier is the full product

Built for high-stakes fields

Pre-medMedical schoolEngineeringComputer ScienceLawGraduate STEMPhD programs

How it works

Works with whatever you have

Slides only

Start with your deck

EchoGraph extracts text from every slide and generates a Synthetic Study Guide automatically. Likely Zone keywords appear immediately — no study guide required.

PDF viewerSynthetic guideBasic flashcards

Add a recording

Layer in the lecture

Whisper transcribes your audio entirely in the browser. The silence-gap engine syncs each word to its slide, measuring dwell time and verbal repetition per topic.

Word-level syncEmphasis detectionConfidence scores

Full session

Surface the Red Zone

Cross-reference your study guide or Anki deck against what the professor emphasized. Red Zone keywords are flagged, scored, hot-linked in the transcript, and exported as flashcards.

Red Zone scoringHeatmap overlayAnki export

Feature highlights

Everything the serious student needs

Red Zone Detection

Cross-references your study guide against slide density and verbal repetition to surface the highest-yield keywords — the ones most likely to appear on the exam.

Professor Emphasis Detection

Measures how long the professor dwells on each slide and how many times they repeat each term. Not just what was said — what was emphasized.

Lecture Confidence Score

Each Red Zone keyword gets a per-keyword confidence score derived from slide density, verbal mentions, and study guide alignment.

Anki Integration

Import your existing deck — card fronts seed the study guide automatically. Export Red Zone flashcards as a valid .apkg file, tagged and ready for spaced repetition.

Zero-Knowledge Encrypted

Your vault passphrase never touches the server. Files are AES-GCM encrypted in the browser before upload. The server stores opaque blobs it cannot read.

Runs Entirely in Your Browser

Whisper and BERT run as WASM Web Workers on your device. No audio ever leaves your machine on the free tier — unless you explicitly opt into Scholar-tier ASR.

Zero-knowledge architecture

The server stores data it cannot read.

EchoGraph's encryption model is not a marketing claim — it's a structural constraint. Your vault passphrase derives the key that wraps your Master Key. That passphrase never leaves your browser.

3-Tier key hierarchy

Passphrase (your memory only)

↓ PBKDF2 · 310,000 iterations · SHA-256

KEK (memory only, discarded after unwrap)

↓ AES-KW unwrap

Master Key (non-extractable CryptoKey)

↓ AES-GCM 256 · unique IV per file

Encrypted .bin blob (stored in Supabase)

Vault passphrase never leaves your device — not even hashed
Master Key is non-extractable; created with extractable: false
Files are AES-GCM 256 encrypted before upload — the server stores opaque blobs
PBKDF2 at 310,000 iterations runs in a Web Worker, never on the main thread
Whisper + BERT run locally via WASM — no audio or text leaves the browser on Free tier
Row-Level Security enforced on all database tables and storage buckets
No password reset exists. There is no backdoor.

Pricing

Free tier is the full product

The complete core pipeline is free. Paid tiers add better ASR and more storage — not access to basics.

Free

$0forever

The full core product.