The best AI tutors for self-learners in 2026

For most self-learners, ChatGPT study mode and Gemini Guided Learning are the best free AI tutors: both ask you questions instead of handing over answers. Khanmigo is the low-cost pick for school subjects, at $4 a month in the US. If you want a tutor that sits on top of a researched, cited course, Gregator's tutor, Greg, reads your Chapters and can add new ones.

Disclosure: Gregator is our product. We put it where we think it fits, and we say where other tools do the job better.

Quick picks

What makes a good AI tutor?

A chatbot gives answers. A tutor makes you do the thinking. We judged each tool on six points:

  1. It asks before it tells. Questions and hints come first.
  2. It adapts. Explanations match your level.
  3. It remembers. You can pick up a topic the next day.
  4. It checks you. Quizzes or practice questions show what stuck.
  5. It ties to material you can check. You can see where the teaching comes from.
  6. Price and access. What the free plan gives, and who can sign up.

We read each product's official pages in October 2026 and list only what they say.

The best AI tutors, by use case

ChatGPT study mode: best free all-round tutor

Study mode is on every ChatGPT plan, including Free, and it covers most of the six points above. OpenAI says it gives step-by-step guidance instead of quick answers, with questions and hints first. Lessons adjust to your level and remember past sessions. Quizzes and open-ended checks test what stuck, and it tracks your progress.

See Gregator vs ChatGPT.

Gemini Guided Learning: best free tutor with visuals

Google describes Guided Learning as a mode that "breaks down problems step-by-step and adapts explanations to your needs," and it asks open-ended questions. A Google blog post describes the tutoring loop: after it explains a concept, it checks that you got it, and at the end of a topic it gives a recap and suggests what to study next. It also pulls in diagrams, images, and YouTube videos.

See Gregator vs Gemini.

Claude learning mode: best for being questioned through your reasoning

Anthropic's education page says Claude's learning mode "works like a good tutor: it asks questions that help you find the answers yourself." That is the first of our six points, and it suits subjects where the answer is an argument, not a number. Claude also has memory across chats, and paid plans add Research, which runs a series of searches across the web and connected tools such as Google Docs.

See Gregator vs Claude.

Khanmigo: best for school subjects at a low price

Khanmigo is the AI tutor from Khan Academy, a nonprofit. Its learner page says, "Khanmigo never gives you the answer." It tutors on Khan Academy's exercises, videos, and articles, and covers math, science, coding, history, and the humanities.

Greg in Gregator: best tutor tied to a cited course

Greg is the chat tutor inside Gregator. It is not a standalone chatbot. You start with a topic, and Gregator researches the open web and writes a course of 1 to 12 Chapters with inline footnotes and a Sources list in each one. Greg then reads your Chapters, can search the course and the web, and remembers what you tell it. When a question goes beyond the course, Greg can offer a deep dive that adds a new Chapter.

Comparison table

TutorBest forTeaching styleTies to sourcesFree option
ChatGPT study modeAny subject, any timeQuestions, hints, quizzes, progressWeb search and your filesYes
Gemini Guided LearningVisual, step-by-step helpOpen-ended questions, checks, recapsYour files and YouTube; per-answer citations not describedYes
Claude learning modeReasoning and writingQuestions that lead you to the answerWeb search; Research on paid plansFree plan; learning-mode plans not stated
KhanmigoSchool subjectsNever gives the answerKhan Academy's libraryTeacher tools only
Greg (Gregator)A topic studied as a courseChat over your Chapters, deep divesA course with footnotes and Sources lists3 courses in total

Others we considered

Which AI tutor should a self-learner use?

Pick by what you start with. If you have a specific question or a problem set, use ChatGPT study mode or Gemini Guided Learning. If you are an adult in the US working through school-level math, science, or coding, Khanmigo is the cheapest paid tutor here. If you want to sharpen an argument, try Claude's learning mode. If you have only a topic and want a structured, cited course with a tutor beside it, use Gregator.

Frequently asked questions

What is the best free AI tutor?

ChatGPT study mode and Gemini Guided Learning are both on free plans and both guide you with questions. Gregator's free plan includes Greg for up to 3 courses in total.

Can an AI tutor replace a human tutor?

For explanations, practice questions, and patience at any hour, AI tutors do well. A human tutor still knows you, holds you to a schedule, and catches mistakes an AI misses. Check what an AI tutor tells you against a source.

Is Khanmigo available outside the US?

Not for learners. Khanmigo's learner plan requires you to live in the United States and have a US billing address. Teacher tools are available in a list of other countries.

Does ChatGPT have a tutor mode?

Yes. Study mode is ChatGPT's tutor mode. It is on every plan, including Free, and gives questions and hints instead of quick answers.

Sources