AI tutor vs human tutor: an honest comparison

In 1984 the educational researcher Benjamin Bloom reported that students taught one-to-one by a tutor, using mastery learning, performed about two standard deviations better than students taught in a conventional class. The average tutored student did better than about 98% of the classroom group. Bloom called this the "2 sigma problem": one-to-one tutoring is very effective, but too expensive to give every student.

That two-sigma figure came from a small number of studies. A 2024 meta-analysis of randomised trials of tutoring for children from preschool to grade 12 found a smaller but still substantial average effect of about 0.29 standard deviations (Nickow, Oreopoulos & Quan, 2024). The core idea holds: personal, responsive teaching with immediate feedback helps students learn.

AI tutoring is new, and the evidence is still building. Two recent randomised trials are worth knowing about:

• Harvard physics (2025). In a randomised trial with 194 undergraduates in an introductory physics course, students learned more from a carefully designed AI tutor at home than from an in-class active-learning lesson led by experienced instructors, and spent less time doing it (Kestin et al., Scientific Reports, 2025). The tutor was built to follow good teaching practice: guiding students step by step rather than giving answers.
• Nigeria (2025). A World Bank study ran a six-week after-school programme in which secondary students used an AI assistant (Microsoft Copilot, powered by GPT-4) with teacher support. Students improved by 0.31 standard deviations on the overall assessment and 0.23 in English, the main subject (De Simone et al., 2025). Teachers guided the sessions, which the authors and commentators note was likely important.

Two cautions: both studies were short, and both used AI tutors designed for teaching, not general chatbots. An AI that simply hands over answers can let students finish homework without learning anything.

• Relationship and motivation. A tutor who knows your child can notice when they're tired, anxious or disengaged, and adjust.
• Accountability. A weekly appointment with a person gets work done.
• Judgement. Experienced tutors know exam technique, common pitfalls and how to prioritise.
• Rich feedback on writing. Detailed comments on essays, coursework and creative work.
• Advocacy. A tutor can talk to parents and sometimes teachers about how a student is doing.

• Help at the moment you're stuck. At 9pm on a Sunday, the AI tutor is there; a human tutor usually isn't.
• Unlimited patience. You can ask for the same idea to be explained five different ways, with no embarrassment.
• Lots of practice. Endless quiz questions with instant feedback, which is exactly the kind of practice that builds memory.
• Every subject. Maths tonight, chemistry tomorrow, history at the weekend.
• Cost. A month of an AI tutor usually costs less than a single hour with a human tutor.

• Mistakes. AI can be wrong, especially on long calculations or unclear handwriting. Choose a tutor that shows its reasoning, and check important answers against a textbook or teacher.
• Answer-giving. A tool that just supplies answers can harm learning. Look for one that asks questions and checks understanding. TutorAura guides by default and only gives full solutions when asked.
• Over-reliance. Students still need to practise on their own and under test conditions.
• Safety and privacy for children. Check how the product handles younger users and personal information. Our AI tutor for kids page explains our approach.

Care.com's cost data puts the US national average starting rate for private tutors at about $26 an hour, and tutoring software company Wise reports a typical range of $25 to $80 an hour depending on subject, experience and location. Specialist test prep usually costs more.

At $26 an hour, one session a week is roughly $112 a month (about 4.3 weeks). TutorAura costs $15 a month for every subject, used as often as you like within fair-use limits, with a free 3-day trial.

• Choose a human tutor if a student is far behind and needs a structured catch-up plan, lacks motivation and needs accountability, has specific learning needs that need an expert, or wants detailed feedback on extended writing.
• Choose an AI tutor if a student mostly needs help with homework and practice, studies several subjects, gets stuck at times when no one is around, or the budget doesn't stretch to weekly tutoring.
• Use both if you can: a human tutor every week or two for direction and motivation, and an AI tutor for daily practice and homework in between. Tell the AI tutor what the human tutor is working on, and it will reinforce it.