At sunrise, a student sits with a notebook on a grassy bluff above the Golden Gate Bridge, the city beyond the fog under a wide gold and blue sky.

A personal maths tutor you can talk to.

For the maths you're stuck on, whenever that is. It explains on a whiteboard and stays with you until it clicks.

Private beta, small batches.

A lesson on the chance of two greens on two spins of a spinner: a five-by-five grid of colour pairs with the green pairs shaded, the sum 2/5 × 2/5 = 4/25 with the first 2/5 ringed, and the tutor saying: Two of the five slices are green on each spin.
Late at night, two people work at a desk by a lamp in front of a whiteboard with a triangle drawn on it.

Stuck at ten at night, with no one to ask.

The teacher is gone until tomorrow. Parents often learned it a different way. A tutor, if you have one, comes next week.

Join the waitlist

Ark One is there when you're stuck.

  1. It explains on a whiteboard.

    Say or type what you're stuck on. It draws the problem, talks you through it and asks what you think as it goes.

    A lesson on dividing fractions: a ribbon three quarters of a metre long cut into eighths with six marked, 3/4 ÷ 1/8 = 3/4 × 8/1 with 3/4 × 8/1 ringed, and the tutor asking why the answer can be greater than one.

  2. It won't do it for you.

    It marks the line where you went wrong and asks a question about it. The full solution comes only after you've tried.

    Homework: find the vertex of y = x² − 4x + 1. The line y = 2² − 4·2 + 1 = 3 is marked, and the tutor asks: What do you get for 4 − 8 first?

  3. Ready before the test.

    Turn a lesson into short practice levels you answer on the graph, and a one-page summary to read the night before.

    From Pro. See pricing

    A practice level: on y = (x − 2)² + 1, tap the point where the curve stops falling and starts rising. The point (2, 1) is ticked, and a card reads: Correct! The lowest point is (2, 1).

Try a level.

The best way to learn was never a secret.

One-to-one works. There were never enough teachers to give everyone that time.

Read why

Questions

What is Ark One?

A personal maths tutor in an app. You talk to it, or type, and it explains on a whiteboard and asks you questions until you can explain it yourself. There are short courses too, with graphs you drag to answer.

What maths does it cover?

The maths you bring, in your own words: quadratics before an exam, the matrices at work, tonight's homework. You can start from a photo of the problem.

Will it just give me the answer?

No. It asks what you think before it explains. In homework a hint comes first, and the worked solution waits until you have tried.

Which devices?

An app for iOS and Android.

Does it record my voice?

The tutor listens while a lesson is running, and the lesson is saved so you can replay it.

How do I get in?

Join the waitlist. Ark One is in private beta and lets people in by small batches, earliest first.

Get in while it's quiet.

Start free today. The waitlist is for the plans.

Invites follow the list, earliest first.