Why a tutor for everyone

The best way to learn was never a secret.

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

What worries you about an AI tutor?

A maths lesson · thirty students, one teacher, fifty minutes

  1. Picture a maths lesson.

    Someone near the back is still stuck on the first question.

  2. Now divide the attention.

    Fifty minutes shared equally gives each student a hundred seconds.

  3. Some get more time after school.

    Three in ten pupils in England have had private tuition.1

  4. Nobody thinks that's fair.

    The chance to ask again depends on what a family can afford.1

Where students finish a course · percentile of the classroom

Start End of course Classroomthirty students, one teacher One to oneabove 98% of the class2

What AI tutoring trials found

Stanford, 2024+4 percentage points in mastery overall; +9 for students of the lowest-rated tutors.5 Human tutors used AI support.
Harvard, 20250.73 to 1.3 standard deviations; over twice the learning in less time than in-class active learning.4
Nigeria, 20240.23 to 0.3 standard deviations after six weeks of after-school AI tutoring, worth 1.5 to 2 years of ordinary schooling.3
Classroom With a tutor

  1. Bloom measured what a tutor could change.

    In 1984, he compared classroom learning with one-to-one tutoring.2

  2. Look where the tutored students finished.

    About two standard deviations ahead, above 98% of the classroom; later studies find a smaller gap.27

  3. Three trials bring the line closer.

    The two that report standard deviations land short of Bloom's tutor and clear of the classroom.34

  4. The tutor was the expensive part.

    Ark One is for everyone in the classroom, including the twenty-one who never had a tutor.

You said: it'll replace teachers.

Fair. In Ark One's scenes you move the graph or the circle yourself, so the answer comes from what you do.

2× More than twice the learning with an AI tutor, compared with in-class active learning. Harvard, 2025.4

It can. So the model writes the practice, and the scene's maths engine checks every answer you make.

0 answers marked by a language model.

Teachers matter, and there are not enough of them. Ark One gives students somewhere to keep working once the teacher's time has run out.

44M additional teachers needed by 2030. UNESCO, 2024.6

Ark One opens to the waitlist first.

Join the waitlist
Sources
  1. Sutton Trust, Tutoring: The New Landscape, 2023. 30% of pupils aged 11 to 16 in England report having had private tuition; 30% in the best-off households against 23% in the worst-off.
  2. Benjamin S. Bloom, “The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring”, Educational Researcher 13(6), 1984. The chart above is an illustration of the reported result, not Bloom's data.
  3. World Bank, From Chalkboards to Chatbots: Evaluating the Impact of Generative AI on Learning Outcomes in Nigeria, 2024. Six weeks of after-school tutoring with GPT-4 in nine public schools in Benin City; 0.23 standard deviations in English (up to 0.3 on some measures), equivalent to 1.5 to 2 years of business-as-usual schooling, at $48 per student. On the chart, an effect of 0.23 to 0.3 standard deviations places the average treated student at the 59th to 62nd percentile of the control group.
  4. Kestin, Miller et al., “AI tutoring outperforms in-class active learning”, Scientific Reports, June 2025. A randomised trial of 194 Harvard physics students; the AI tutor was given the correct solutions and limited to short replies. Effect size 0.73 to 1.3 standard deviations by quantile regression, 0.63 by linear regression which the authors note is depressed by a ceiling effect. On the chart, 0.73 to 1.3 standard deviations is the 77th to 90th percentile of the classroom group.
  5. Wang, Demszky et al., Tutor CoPilot: A Human-AI Approach for Scaling Real-Time Expertise, Stanford, 2024. A randomised trial with tutors and students from underserved communities; +4 percentage points to mastery overall, +9 for students of the lowest-rated tutors.
  6. UNESCO and the International Task Force on Teachers, Global Report on Teachers, 2024. 44 million additional teachers needed by 2030 to reach universal primary and secondary education.
  7. Education Next, “Two-Sigma Tutoring: Separating Science Fiction from Science Fact”, on later replications finding smaller effects than Bloom's two standard deviations.

Who it's for

The maths you're stuck on.

Get in while it's quiet.

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