Earmark

Watching lectures is easy.
Remembering them is the hard part.

Earmark is an active note-taking copilot for online courses. Mark what matters while you listen — get a clean Markdown note the moment it ends.

Lecture II REC 00:12:04
A binary search tree keeps its left subtree smaller than the node.
That invariant is the whole reason lookup costs log n.
If the tree degenerates into a list, you are back to linear time.
✎ exam: prove the O(n) worst case
Which is exactly what self-balancing trees are there to prevent.
SummaryNotes
[00:10:00–00:20:00]
Summary for this span
  • BST invariant → log n lookup
  • Degenerate tree → O(n) worst case
  • Self-balancing exists to hold the invariant

How it works

Three steps, zero friction. Works with any lecture playing in a browser tab — Udemy, Coursera, YouTube, your bootcamp's portal.

1

Point it at your lecture

One click captures the audio of any browser tab. The transcript flows live, word by word, as the instructor speaks.

2

Mark while you listen

Star the sentence that matters the moment it's said. Drop in headings. Attach memos to exact moments — without pausing the video.

3

Leave with a real note

Reviewable AI summaries every ~10 minutes, built around your marks. One Markdown file per lecture — yours to keep, Obsidian-ready.

Recording a lecture and reading the transcript later doesn't work. Passive transcripts are where learning goes to die.

Research on note-taking agrees: people who process while listening retain more than people who transcribe. Every existing tool records first and summarizes after. Earmark is built the other way around — the marks you make during the lecture drive the summary and the review questions you get at the end.

Pricing

Start free. Pay only when Earmark becomes part of how you study.

Free 30 min every month About one or two lectures.
  • Live transcription
  • Marks, memos, headings
  • Reviewable AI summaries
  • Local Markdown files
Exam week Weekly $8.99 per week Unlimited recording. Cancel anytime.
Most popular Monthly $21.99 per month Unlimited recording, every month.
Save 47% Yearly $139.99 per year Best value if Earmark sticks.

Your notes stay yours

Every lecture is a Markdown file on your own machine, not a row in our database. Cancel whenever you like — every note you already made still opens, in Obsidian or any text editor, with or without us.

Prices in USD and not final. Waitlist members get first access and keep the launch price.

🗂 Local-first Markdown

Your notes are plain .md files on your machine — not rows in someone else's database. Obsidian-friendly out of the box.

🔒 Audio never stored

Audio is streamed for live transcription and discarded. What's kept is your note — and it's kept by you.

Be first in line when the hosted version opens