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Case study · EdTech

Examind: an AI study platform that turns hours of lectures into exam-ready notes in minutes

Examind is a course-grounded AI study platform built for distance-learning students. It ingests lecture audio, video, transcripts, handouts, slides and past papers, then produces structured notes, exam alerts, a citation-backed text and voice tutor, auto-graded quizzes, spaced-repetition flashcards, a day-by-day study planner and one-page revision sheets — every output grounded only in the course's own material, available in English and Urdu, on web and mobile.

Examind: an AI study platform that turns hours of lectures into exam-ready notes in minutes
From raw lecture to finished notes (vs. 2 hours rewatching)
4 min
Quiz score improvement after one revision cycle
22%
AI cost per lecture processed
$0.08
Lectures processed across 12 courses
500+

Overview

Distance-learning students are drowning in material. A single course can include dozens of long video lectures, hundreds of pages of handouts and years of past papers. Rewatching everything before an exam isn’t realistic, and generic AI chatbots confidently invent content that was never taught.

Examind solves this with a platform that reads a course the way a diligent student would — but in minutes rather than weeks. It transcribes lecture recordings, parses every document format a university produces, generates structured notes with likely exam questions, captures the instructor’s own words about what will be tested, and answers questions — by text or voice, in English or Urdu — through a tutor that cites the exact lecture it drew from and says plainly when something isn’t in the course.

From there it closes the study loop: flashcards with spaced repetition, quizzes with AI grading, a weak-topic dashboard, an exam-countdown planner, concept maps, print-ready revision sheets and export to PDF, Anki and Notion. Courses can be shared across study groups, and teachers get a dashboard showing which topics the class is struggling with.

Built on Next.js 16, TypeScript, Anthropic Claude, Voyage AI embeddings, Supabase (Postgres + pgvector), a Python/Docling parsing service and a hybrid speech-to-text pipeline, Examind is a production-deployed, cost-engineered, monetised platform available on web, mobile and offline PWA.

Business challenge

Making an entire course revisable without rewatching it

Students on distance-learning programmes face a material-volume problem that traditional study methods can’t absorb. Lectures are long and unindexed, handouts are delivered as single monolithic PDFs, and the most valuable signal — the instructor saying ‘this will come in the exam’ — is buried somewhere in hours of audio.

Existing AI tools make the problem worse. General-purpose chatbots have no knowledge of the specific course, so they hallucinate definitions, formulas and ‘facts’ that contradict what the instructor taught. For a student preparing for a graded exam, a confident wrong answer is worse than no answer.

The product needed to be strictly faithful to the source material, handle messy real-world inputs (raw audio, scanned pages, multi-column layouts, auto-generated captions, maths), work for students who think in Urdu as well as English, run on a phone with unreliable connectivity, and remain cheap enough per student to be viable in a price-sensitive market.

  • Dozens of long lectures per course, impossible to rewatch before exams.
  • Exam hints spoken by instructors get lost in hours of audio.
  • Generic AI chatbots fabricate content not in the course.
  • Course material arrives in every format: audio, video, PDF, Word, PowerPoint, subtitles, scanned images, YouTube auto-captions.
  • Mathematical content needs formulas preserved, not mangled.
  • Keyword-exact terms (function names, acronyms) are missed by pure semantic search.
  • Students need to know what to study next, not just have more notes.
  • Many students study primarily in Urdu, on mobile, with intermittent internet.
  • Teachers have no visibility into which topics a class is actually struggling with.
  • AI costs must stay predictable at per-student scale, with a working billing model.
  • Uploaded course material is sensitive and must be handled privately.

Our solution

A course-grounded AI study platform with a strict no-hallucination rule

Examind was built around one principle: everything the AI produces must be traceable to the course’s own material. Instead of a general-purpose model answering from memory, every note, alert, quiz question, flashcard and tutor response is generated from retrieved course content and cited back to its source lecture.

Around that core, the platform delivers the complete study workflow end to end — transcription and ingestion, note generation, exam-signal detection, text and voice tutoring, past-paper analysis, quizzing with AI grading, spaced-repetition flashcards, weak-topic analytics, exam planning, concept maps, revision sheets and export — inside a single secure, production-deployed application with mobile and offline support, bilingual output, institutional dashboards and per-call cost tracking that powers a plans-and-credits billing model.

What we built

Direct audio and video upload with built-in speech-to-text

Students upload lecture recordings directly. A hybrid transcription pipeline combining cloud and local ASR runs on CPU, splitting audio at the quietest moments so words are never cut mid-sentence. Benchmarked against pure-cloud and pure-local alternatives for accuracy and cost.

Multi-format material ingestion

Accepts PDF, Word, PowerPoint, plain text and Markdown, SRT/VTT subtitles (with YouTube auto-caption de-duplication) and images. A single bulk handout is split automatically into its individual lectures.

Privacy-first in-browser parsing

PDF parsing and OCR run inside the browser via pdf.js and Tesseract.js, so raw files never leave the student’s device. Only the extracted text — after the student reviews it — is stored.

High-accuracy document pipeline

An optional Docling-powered parser recovers document structure and reading order on multi-column pages, OCRs scanned pages and converts maths formulas to LaTeX.

AI lecture notes

Every lecture receives a summary, key definitions, formulas, code and procedures explained step by step, links to earlier lectures and five likely exam questions (MCQ, short and long) with model answers. Unclear audio is marked [unclear] rather than guessed.

Exam alerts

Detects moments where the instructor stressed importance or said something would be examined, quotes their exact words, cross-checks against the handout and pins the result in a sticky highlighted panel on every notes page.

Past-paper intelligence

Uploaded past papers are weighted into the analysis. Topics appearing in both past papers and exam alerts are flagged as highest priority.

Mind maps and concept graphs

Visual maps showing how topics connect across lectures, generated from the course’s own structure and cross-references.

STEM and maths support

Formulas are preserved and rendered as LaTeX across notes, chat, quizzes, flashcards and revision sheets.

Urdu and bilingual explanations

Notes, tutor answers and explanations can be delivered in Urdu, English or side-by-side, while technical terms and citations stay consistent with the source lecture.

Course-aware AI tutor

Retrieval-augmented chat with a citation on every claim (e.g. [L12]). Hybrid search combines Voyage vector embeddings with Postgres full-text search, so exact terms, function names and acronyms aren’t missed. Scope can be limited to a lecture range (‘Lectures 1–22’), and lecture mode loads the full lecture as cached context for fast follow-ups. The tutor says plainly when a question isn’t covered and labels any general knowledge as outside the course.

Voice tutor

Ask questions out loud and hear the answer spoken back, with the same course grounding and citations as text chat. Built for studying away from a keyboard.

Quiz generator with AI grading

Exam-style quizzes across any lecture range: MCQ, short answer or mixed, up to 30 questions. At least half target exam-alert topics; wrong MCQ options are realistic distractors drawn from the same lectures. Short answers are graded 1–5 with one line of feedback on what was missing.

Spaced-repetition flashcards

Flashcards are generated automatically from definitions and exam alerts and scheduled with a spaced-repetition algorithm, so the student reviews each card right before they’d forget it.

Weak-topic analytics dashboard

Quiz and flashcard performance broken down by lecture and topic, with a prioritised ‘study these next’ list that updates after every session.

Exam countdown study planner

Enter the exam date and receive a day-by-day revision schedule that balances weak topics, exam-alert topics and past-paper priorities across the time remaining.

Revision sheets

A compact, print-friendly ‘night-before-the-exam’ page: exam alerts grouped by topic, every definition on one line, all formulas, and the most likely long questions.

Export to PDF, Anki and Notion

Notes, revision sheets and flashcard decks export into the tools students already use.

Shared courses and study groups

One student’s upload can be shared with a group or a whole class, so the course is processed once and everyone benefits.

Institution and teacher dashboard (B2B)

Teachers and institutions see aggregate quiz performance by topic across a class, surfacing exactly where students are struggling before the exam rather than after.

Mobile app and offline PWA

Full study experience on mobile, with notes, flashcards and revision sheets available offline and synced when a connection returns.

Plans, credits and payments

Tiered plans with a credit-based usage model, built directly on the platform’s per-user, per-operation AI cost tracking.

Cost engineering

Prompt caching on system prompts, content-hashed inputs so identical notes never cost twice, and model tiering (a premium Claude model for notes and tutoring; a faster, cheaper model for quizzes and grading). Every AI call is logged by course and operation with a live spend total. Embedding calls retry automatically when rate-limited.

Security and production deployment

Passwordless magic-link login via Supabase Auth with an email allowlist; row-level security on every table, enforced at both the API route and request layer. Dockerised Next.js app, Python parser and Caddy with automatic HTTPS; the parser is internal-only and never exposed to the internet. One-command deploy, or run behind an existing reverse proxy.

How it works

  1. 01

    Upload course material

    The student drops in lecture audio or video, transcripts, handouts, slides, subtitle files and past papers — or joins a course a classmate has already shared. Recordings are transcribed by the hybrid speech-to-text pipeline; documents are parsed and OCR’d in the browser, and the student reviews extracted text before anything is stored.

  2. 02

    Index the course

    Extracted text is chunked, embedded with Voyage AI and stored in Supabase with a pgvector HNSW index alongside full-text search, creating a hybrid retrieval layer over the entire course.

  3. 03

    Generate notes, alerts and maps

    Each lecture becomes structured notes with definitions, step-by-step explanations, cross-lecture links and likely exam questions, in English or Urdu. Instructor exam hints are extracted verbatim and cross-checked against the handout. A concept graph is built across the course.

  4. 04

    Study with the tutor

    The student asks questions by text or voice, scoped to the course or a lecture range. Every answer cites its source lecture; anything outside the course is labelled as such.

  5. 05

    Practise and track

    Past papers sharpen topic priorities. Quizzes are generated and auto-graded with feedback; flashcards are reviewed on a spaced-repetition schedule. The weak-topic dashboard updates after every session, and the countdown planner reshapes the daily schedule toward the exam date.

  6. 06

    Revise and export

    A print-ready revision sheet condenses the whole course for the night before. Notes, sheets and flashcard decks export to PDF, Anki and Notion — on web, mobile or offline.

Business impact

Exam preparation measured in minutes, not weekends

Within 4 months, Examind moved a course from ‘dozens of unwatched lectures’ to a fully transcribed, indexed, examinable knowledge base — with every AI output traceable to its source, a clear answer to ‘what should I study next’, and every AI dollar accounted for.

  • Zero fabricated content: every note, alert, flashcard and tutor answer is grounded in and cited to the course’s own material.
  • Instructor exam hints are surfaced and quoted verbatim, so students stop missing what they were explicitly told would be tested.
  • Students see a ranked list of weak topics and a daily plan instead of an undifferentiated pile of notes.
  • Urdu-speaking students study in the language they think in, without losing fidelity to the source lecture.
  • Raw course files never leave the student’s device, with only reviewed text stored server-side.
  • Shared courses mean a class processes material once instead of 30 times, cutting per-student AI cost.
  • Teachers see class-level weak topics before exams, not after.
  • Per-course, per-operation cost visibility underpins a working plans-and-credits billing model.
  • Production-grade security (RLS, allowlisted auth, internal-only parser) in a one-command deployable stack, delivered on web, mobile and offline PWA.

What's next

With a grounded retrieval core, multilingual output, institutional dashboards and usage-based billing already in production, Examind is positioned to extend into deeper learning analytics, broader language coverage and tighter integration with university learning-management systems — helping more students, in more markets, walk into exams knowing exactly what they were taught.

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FAQ

Frequently asked questions

What is Examind?

Examind is an AI study platform that converts lecture recordings, transcripts, handouts, slides and past papers into structured notes, exam alerts, flashcards, quizzes, study plans and revision sheets, with a text and voice tutor that answers only from the course’s material.

How does Examind avoid AI hallucinations?

Every output is generated from retrieved course content and cited to its source lecture. Unclear audio is marked [unclear] rather than guessed, and the tutor explicitly labels anything that isn’t in the course.

What file formats does Examind accept?

Audio and video recordings, PDF, Word, PowerPoint, plain text, Markdown, SRT/VTT subtitles (including YouTube auto-captions) and images, with OCR for scanned pages.

Is my course material private?

Yes. Document parsing and OCR run in the browser, so raw files never leave your device. Only the text you review and approve is stored, protected by row-level security.

What are exam alerts?

Exam alerts capture moments where the instructor said something would be tested, quoting their exact words and cross-checking against the handout. They appear in a pinned panel on every notes page.

Does Examind work in Urdu?

Yes. Notes, explanations and tutor answers can be delivered in Urdu, English or both, while staying grounded in the original lecture.

How does Examind tell me what to study next?

The weak-topic dashboard tracks quiz and flashcard performance by lecture and topic, and the exam-countdown planner turns that into a day-by-day schedule up to your exam date.

Can I use Examind on my phone or offline?

Yes. Examind is available as a mobile app and an offline-capable PWA; notes, flashcards and revision sheets sync when you’re back online.

Can I share a course with my classmates?

Yes. Courses can be shared with study groups or an entire class, so material is processed once and everyone benefits.

What does the teacher dashboard show?

Institutions and teachers see class-level quiz performance by topic, highlighting where students are struggling before the exam.

How does Examind handle maths and formulas?

Formulas are preserved and rendered as LaTeX across notes, chat, quizzes, flashcards and revision sheets.

How are quizzes graded?

MCQs are auto-marked with realistic distractors drawn from the same lectures. Short answers are graded 1–5 by AI with one line of feedback on what was missing.

Can I export my notes?

Yes — notes, revision sheets and flashcard decks export to PDF, Anki and Notion.

What technologies power Examind?

Next.js 16, TypeScript, Anthropic Claude, Voyage AI embeddings, Supabase (Postgres + pgvector), Python FastAPI with Docling, a hybrid speech-to-text pipeline, and a Dockerised deployment with Caddy.

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