Khanmigo
Khanmigo is the cheapest serious AI tutor for a family and the only one that deliberately refuses to just give the answer, which is exactly what you want for a child and exactly what an adult cramming for an exam will find slow. It lives inside Khan Academy's curriculum, so it is strongest on school maths, science and writing, and weak the moment a question leaves that syllabus.
Pros
- $4 a month, or $44 a year, is far below general assistants' paid tiers
- Guided, answer-withholding tutoring is built for learning rather than cheating
- Tied to Khan Academy's exercises, so help lands on the actual problem in front of the student
- Teacher tools are free, and a nonprofit runs the product
- Voice in and out, chat history and coding feedback are included at the base price
Cons
- Paid learner access is US-only by billing address
- No free trial for families; teachers get the free tier, students do not
- Students in a class only get access if the school or district signs up, not through their teacher
- The guiding-questions style is deliberately slow and can frustrate older learners