ReadlisReadlis
Lecture summarizer

Your 90-minute lecture, as clean study notes.

Paste a YouTube lecture, MIT OpenCourseWare link, or any recorded class. Readlis pulls the definitions, the key arguments, and the timestamps so you can find each point again.

Try it free See Pro pricing

5 free summaries a month. No card.

What you get

  • Works on YouTube lectures, MIT OCW, Coursera, guest talks
  • Definitions, formulas, and key arguments pulled out cleanly
  • Timestamps so you can jump back to any moment
  • Ask follow-up questions to test your understanding
  • Save every lecture — build a searchable notes archive

Made for

  • 3Blue1Brown series before a linear algebra exam
  • Andrew Huberman podcast episodes on sleep or focus
  • MIT OCW lectures you've been meaning to finish
  • A guest lecture your friend told you not to miss

How it works

  1. Step 1
    Paste the lecture link

    YouTube, MIT OpenCourseWare, Coursera, or any public recorded lecture URL. No download required.

  2. Step 2
    Readlis transcribes + reads

    The transcript is pulled and analyzed for definitions, formulas, arguments, and the moments they appear in the recording.

  3. Step 3
    Study from clean notes

    You get sectioned notes with clickable timestamps. Jump back to any moment, or ask a follow-up to test your understanding.

Example outputs

Real examples of what Readlis returns. Every summary is generated fresh — these are samples for reference.

STEM lecture
3Blue1Brown — Essence of Linear Algebra, Ch. 3

Matrices are transformations of space. Every matrix describes where the basis vectors î and ĵ land after the transformation.

  • • 02:14 — A linear transformation keeps gridlines parallel and evenly spaced, and keeps origin fixed.
  • • 05:31 — î lands on column 1 of the matrix; ĵ lands on column 2.
  • • 09:47 — Matrix-vector multiplication = scaled sum of the transformed basis vectors.
  • • 12:20 — Composition of transformations = matrix multiplication (read right-to-left).
Humanities lecture
Yale OYC — Introduction to Political Philosophy, Lec. 1

Political philosophy asks the normative question — not 'what is?' but 'what ought to be?' — and starts with three thinkers: Plato, Machiavelli, Hobbes.

  • • 04:10 — Definition: politics is who gets what, when, and how (Lasswell).
  • • 18:22 — Regime = the arrangement of offices and the way of life it produces.
  • • 31:05 — Plato's Republic asks: is justice good in itself, or only for its rewards?
  • • 47:40 — Assignment: read Republic Books I–II, focus on Thrasymachus's challenge.

FAQ

Does it work on videos without captions?+

Yes. If YouTube auto-captions exist, we use them. If not, Readlis transcribes the audio directly. Manual captions (when available) are preferred for accuracy.

Are the timestamps clickable?+

Yes — every timestamp opens the video at that exact second in a new tab. You can jump back and rewatch any point.

Can I use it on paid course lectures?+

Only on lectures you can legally access. If the URL is private or requires login, Readlis cannot fetch it. For paid platforms, download the lecture (if allowed) and upload the file instead.

How long can the lecture be?+

Free tier: up to 90 minutes. Pro: up to 6 hours per lecture. Longer lectures are chunked automatically.

Will it catch every definition?+

Readlis pulls the definitions the lecturer explicitly gives. If something is only shown on a slide, it may be missed — always check against the original for high-stakes exams.