Penfree Join the waitlist

Pen down, attention up.

Record your lecture. Penfree writes notes you can trust, then quizzes you ten minutes a day until the exam.

The Penfree app showing study notes for a Calculus I lecture: a quick check on the lecture's key ideas, and a math check flagging that the lecture said 5 where the correct value is 6.
Penfree recording a Calculus I lecture on an iPhone, with the live transcript underneath.

Made for every lecture you sit in

One lecture in. One note you can trust out.

A sample lecture we wrote, with one deliberate slip at x = 3. Penfree's note is its unedited output.

The lecture
What Penfree wrote

The graph is live. Drag it or scroll to zoom.

Notes you don't have to double-check.

Only what your lecturer said.

Penfree writes from the transcript and nothing else. No invented facts, no filler pulled from the internet. If it wasn't said in the lecture, it isn't in your notes.

Said in the lecture: “Using the power rule, the derivative f prime of x is two x.”

Every calculation, checked again.

A math engine reworks each calculation from the numbers in the lecture. When something doesn't add up, Penfree flags it instead of quietly changing it, so you know exactly what to check.

The lecturer said 2 × 3 = 5. Penfree flagged it instead of quietly changing it.

Graphs from the lecture's own numbers.

Functions, distributions, charts and diagrams are drawn by code from what was stated, so a graph never shows a value nobody said.

Plotted from what the lecture stated: f(x) = x² and its derivative 2x, from −3 to 3.

Built on notes you can trust, so your revision is too.

Most study apps quiz you on whatever got written down. Penfree quizzes you only on what your lecturer said, with the math already checked, and shows you exactly what to study before each exam.

10 min
a day, across every course
3 days
of correct answers to master an idea
10 days
of exam sprint before every exam

Daily Capsules

A short quiz every day, built only from your own lectures. An idea counts as mastered once you get it right on three separate days, and the questions move from recall to applying it to exam-style.

How one idea gets mastered

Slope of the tangent line

  1. Day 1Recall
  2. Day 4Apply
  3. Day 9Exam-style
  4. MasteredComes back before the exam

Readiness map

Before each exam, every topic from your lectures is marked solid, shaky or untouched, so you spend your study time where it actually matters.

Calculus I, using the sample lecture's topics
  • Power rule
  • Derivative as a slope
  • Slope at a point
  • Graphing f and f′
  • Tangent line equation
  • Derivative of x³

SolidShakyUntouched

From the lecture hall to notes in minutes.

Record on your phone or laptop. Penfree does the rest while you listen.

Record the lecture

Tap record in the browser. Nothing to install, and a dropped connection doesn't lose a thing.

Transcribed as it happens

Every ten seconds of audio becomes text, so the transcript is ready the moment class ends.

Notes a few minutes later

Clean, checked notes saved under the course and searchable for the rest of the term. Already have a transcript? Paste it in.

The details that make it usable.

Capture

  • Phone or laptop

    Records right in the browser. Nothing to install.

  • Add your slides

    Upload the lecture PDF and the notes pick up what was on screen.

  • Code stays code

    Programming lectures keep their code in proper, readable blocks.

Library

  • Search every lecture

    Find any topic across all of your courses in a second.

  • Synced everywhere

    Notes are saved to your account and open on any device.

  • Essay subjects too

    History and literature get clean, structured notes without forced graphs.

Your lectures stay yours.

  • Audio is deleted right after it's transcribed. Recordings are never stored.

  • Your notes are private to your account. Nobody else can read them.

  • Nothing trains AI. Your lectures and notes are never used to train models.

Read the privacy policy

Questions, answered.

How much does it cost?

Penfree is free during the private beta. Student plans launch in November, and you'll see the price before anything is ever charged.

Am I allowed to record my lectures?

It depends on your school and instructor, so check your course policy or ask your professor. Most are fine with recording for personal study. Penfree reminds you before your first recording.

Does it work for subjects without math?

Yes. Essay-heavy courses get clean, structured notes. Graphs and math checks only appear when the lecture actually contains them.

How is this different from other note and flashcard apps?

Other apps summarise a recording or quiz you on whatever got written down. Penfree writes only from your lecture, rechecks the math with a separate math engine, and builds your daily quizzes and readiness map from those checked notes. ChatGPT, by comparison, answers from everything it has read, not from your lecture.

What happens to my audio?

It's transcribed in short pieces, and each piece is deleted right after. Only the transcript and your notes are saved, privately to your account.

When can I get in?

We're letting people in small groups during the private beta. Join the waitlist and we'll email you when your spot opens.

Put the pen down.

Join the waitlist for the private beta.

Free during private beta. Student plans launch in November.