Stop copying answers. Find your mistake.

Write homework with Apple Pencil. Tap Check and the coach circles your first mistake, right on the page.

You're on the list. We'll email you the link to open on your iPad.

Free while we test on real iPads. No card needed. The first round is a small group of testers 18 and older in the US, on an invite code.

Real coach, recorded in the iPad simulator. The writing is scripted and sped up; the reading, the circle, the notes and the quiz are the app's own output.

Screen recording of Pencil Coach on an iPad, scripted writing sped up, coach output real. He writes 4x - 3 = 21, then 4x = 18, and taps Check. The coach tags the line, circles 4x = 18 in orange and writes: undo the -3 by adding 3, not taking 3 away. It draws a balance scale and asks what happens to the 21. He fixes the line to 4x = 24 and checks again: ticks land on both lines. The video goes on to handwritten Python, the Talk button answering out loud, and a practice quiz the coach writes on the page.

How it works

  1. A lined page mid handwriting: the line 4x - 3 = 2 written partway through.

    Write.

    On a blank page or your homework PDF. Math or code.

  2. After tapping Check, an orange Reading tag sits on the line 4x = 18 and the card below says Reading your page.

    Tap Check, or just ask.

    "How should I think about this?" works out loud too.

  3. Both lines ticked green after the fix: 4x - 3 = 21 and 4x = 24. The coach card says: That line is right. What move comes next to find x?

    Fix it yourself.

    It says what went wrong and what to do next. Stuck? It writes the setup, draws it out, or shows a similar example. The answer only if you ask.

Copying gets the homework done.
Understanding gets the test done.

The circle lands on the line you wrote.

Not in a chat window beside it. Your work stays yours; the coach's marks sit right on your page.

A real check in Pencil Coach: 4x - 3 = 21 ticked green, the line 4x = 18 circled in orange, the coach's note beside it in orange handwriting, a balance scale it drew, and its card asking what happens to 21 when you do the same move on both sides.

What the coach does

A balance scale the coach drew on the page in orange ink: 4x - 3 on the left pan, 21 on the right.

It draws it.

A balance scale or a number line, right on your page, when a picture explains it better than words.

The coach card with its I read pill showing 4x = 18, then its explanation and the buttons Let's fix it, I don't get it, Give me a nudge, Show me how, Got it.

It tells you what it read.

Every check says what it read off your page. If it read you wrong, you fix it before anything else.

Handwritten Python set as a code block: the line return [i, j] circled in orange, the coach's note saying this code gives the wrong answer on one of the tests, and its card below.

Handwritten code too.

A LeetCode loop in pencil gets the same treatment as algebra: the first wrong line circled, the reason in plain words.

A Talk session: handwritten code for i in range(5): print(i) at the top, the coach's spoken reply on a card, and the End button beside it.

It talks.

Tap Talk and ask out loud. It answers in words and keeps pointing at your page.

later test scores after plain AI help

What the research says

In a study of about 1,000 high schoolers, plain AI help cut later test scores 17%. A tutor that guided them instead of handing over answers mostly fixed that.

Bastani et al., PNAS 2025. Generative AI without guardrails can harm learning: Evidence from high school mathematics.

Free while we test

Beta

$0during the beta

Free while we test on real iPads. No payment is taken.

Join the iPad beta

Free

3Checks a day

Free stays free after the beta. No card needed.

Pro

$59.99a year

After the beta. A free 7 day trial on the yearly plan, or $9.99 a month. Up to 60 Checks a day.

Cancel in Settings in 2 taps.

Questions

Something else? Contact us.

Does it give me the answer?

Not by default. It shows where your work went wrong and explains why in plain words, and it can walk you through a similar example or a quick visual. If you clearly ask for the answer, it shows the step and why it works.

Can it read my handwriting?

It shows you what it read, and asks when it isn't sure. Neat print reads best today.

Does it work on my homework PDF?

Yes. Import the PDF, write on it, ask about any question.

Which iPads?

Any iPad with Safari and an Apple Pencil (1st gen, 2nd gen, USB-C, Pro). Finger works too, Pencil is better.

Is this cheating?

It's built to stop the copy and paste habit: no answer until you've tried. Your teacher sees your work, not ours.

What gets sent to the AI?

A picture of the page you're on and what you typed, only when you tap Check or ask. Nothing in the background.

How old do I need to be?

The app is for ages 13 and up. The first beta round is for adult testers, 18 and older, in the US.

Does it do coding?

Yes. Python and LeetCode style problems, handwritten.

What happens after the beta?

Free stays at 3 Checks a day. Pro is $59.99 a year or $9.99 a month.

Stop copying answers. Find your mistake.

You're on the list. We'll email you the link to open on your iPad.

Free while we test on real iPads. No card needed. The first round is a small group of testers 18 and older in the US, on an invite code.