Synthesis Tutor vs Khanmigo: Best AI Math Tutor for Kids (2026)

The quick answer: Synthesis for visual learners, Khanmigo for independent readers

If your child is 5-8 and struggles with maths confidence, start with Synthesis Tutor. It uses colourful manipulatives, a friendly AI voice, and adaptive difficulty that meets kids exactly where they are. My 6-year-old daughter can use it with minimal reading.

If your child is 9+ and needs help across multiple subjects, Khanmigo is the better value. It's built on Khan Academy's entire free content library and teaches through guided questions rather than giving answers. But it requires typing and reading fluency, so it's not practical for younger kids.

Neither replaces a human tutor for complex learning difficulties. Both are dramatically cheaper than one.

How they teach: two completely different philosophies

Synthesis Tutor: show, don't tell

Synthesis uses a multi-sensory approach. When my son was learning fractions, the AI showed him fraction boxes on screen, let him drag pieces around, and walked him through the concept with voice narration. It felt less like homework and more like a puzzle game.

The AI tutor is warm and patient. When my daughter got an answer wrong, it didn't just say "try again." It adjusted the visual, broke the problem into smaller steps, and tried a different angle. The difficulty adapts in real time based on how the child is performing.

It's maths-only, covering counting through algebraic thinking for ages 5-11 (K-5 in US terms). That narrow focus is both its strength and its limitation.

Khanmigo: ask, don't tell

Khanmigo takes the Socratic approach. It never gives your child the answer. Instead, it asks guiding questions: "What do you notice about this equation?" or "What operation should we try first?"

This is powerful for building genuine understanding. When my 8-year-old got stuck on a word problem, Khanmigo walked him through it step by step without doing the work for him. He had to think through each stage himself.

The trade-off: this is mostly text-based. Your child needs to read the questions and type responses. My 6-year-old found this frustrating. She wanted to see pictures and hear voices, not read paragraphs. Khanmigo does have speech-to-text support, but the core experience is still a text conversation.

Maths head-to-head: the same concept, taught two ways

I had both kids work on fractions using both tools. The difference in approach was striking.

Fractions on Synthesis Tutor

The AI showed a pizza split into pieces on screen. My daughter dragged slices around, combining halves and quarters while the tutor narrated what was happening. Within 10 minutes, she could identify basic fractions visually without any reading required.

The questions adapted quickly. When she got three right in a row, the difficulty bumped up. When she stumbled, it dropped back and tried a different visual representation (switching from pizza to number lines).

Fractions on Khanmigo

Khanmigo pulled up a Khan Academy exercise and sat alongside it as an AI helper. When my son entered a wrong answer, instead of just marking it incorrect, Khanmigo asked: "What does the bottom number of a fraction tell us?"

He had to think about it and type his response. The AI then built on his answer, guiding him toward the correct understanding. It took longer, but by the end he could explain the concept in his own words.

The downside: Khanmigo has documented issues with maths accuracy. Because it runs on a large language model (GPT-4o), it occasionally makes basic computation errors. Khan Academy has added a built-in calculator to help, but it's an ongoing limitation. Synthesis Tutor, purpose-built for maths, doesn't have this problem.

Beyond maths: where Khanmigo pulls ahead

If your child only needs maths help, this section doesn't matter. But most kids don't struggle with just one subject.

Khanmigo covers:

• Maths (primary through to early college level)
• Science (including physics and chemistry for middle schoolers)
• Reading and writing (with a dedicated Writing Coach feature)
• Computer science (Python, JavaScript, HTML with auto-graded challenges)
• History and humanities
• SAT and AP test prep
• College admissions coaching

Synthesis Tutor covers maths. That's it. K-5 maths specifically.

For families with older kids who need help across the board, Khanmigo's breadth is hard to beat at $44/year. My son used Khanmigo's Writing Coach for a school book report last month. It didn't write the report for him (it refuses to), but it helped him structure his thoughts, suggested where his argument was weak, and caught grammar issues. That's a genuine time-saver for parents who usually spend evenings editing homework.

Safety and privacy: both take it seriously

Both tools are COPPA compliant and require a parent or guardian to set up accounts for children under 13. Neither sells children's data. Here's where they differ.

Khanmigo has the edge on transparency here. Parents can read every conversation their child has had with the AI, and get email alerts if anything is flagged. Synthesis gives you weekly progress summaries but doesn't let you see the actual interactions in the same detail.

Both are significantly safer than letting kids use ChatGPT directly. Neither tool will go off-topic, generate inappropriate content, or give answers without educational context.

Pricing: the honest numbers

This is where the comparison gets uncomfortable for Synthesis Tutor.

I need to be transparent about Synthesis Tutor's pricing. When I first signed up, I paid $79/year. That increased to $119/year at renewal. Their current website shows $119/year for the annual plan ($29/month if you go monthly). It used to be higher, but the current price is more competitive, though still nearly 3x what Khanmigo charges.

That said, comparing price alone isn't fair. Synthesis Tutor is a purpose-built maths learning environment with visual manipulatives, voice narration, and adaptive difficulty. Khanmigo is a text-based AI layer on top of Khan Academy's existing free content. They're different products solving different problems.

If your child needs intensive maths support and the visual approach clicks for them, Synthesis may justify the premium. If you want solid AI-assisted learning across all subjects, Khanmigo is extraordinary value.

What worked (and what didn't) with our kids

My 8-year-old (Cillian)

Synthesis Tutor: This is where he learned multiplication before school. After nine months of regular use, his maths confidence has completely changed. He asks to do Synthesis the way other kids ask for screen time. The visual approach to fractions and place value clicked for him in a way textbooks never did.

Khanmigo: He took to the Socratic questioning surprisingly well. When Khanmigo asked him "What do you think happens when you multiply a fraction by a whole number?", he actually paused and thought about it instead of guessing. The Writing Coach also helped with a school book report. He liked that it felt like talking to a smart friend rather than doing a lesson.

Verdict for him: Khanmigo is becoming his go-to for homework help across subjects. Synthesis stays in the rotation for focused maths practice.

My 6-year-old

Synthesis Tutor: She can use it mostly independently. The voice narration means she doesn't need to read much, and dragging fraction pieces or counting blocks keeps her hands busy. She loses interest after about 15 minutes, which is fine for her age.

Khanmigo: Too text-heavy for her right now. She got frustrated typing responses and couldn't always read the questions. We tried the speech-to-text feature, but at 6 she doesn't always articulate clearly enough for it to work reliably. We'll revisit this in a year or two.

Verdict for her: Synthesis Tutor is the clear winner at this age. Khanmigo just isn't built for pre-readers.

Honest issues with both

Synthesis Tutor's speech recognition still has problems. My son's name (Cillian, Irish spelling) gets mangled every time, and occasionally correct maths answers spoken aloud are marked wrong. We've learned to use the touch screen instead of the microphone for actual answers.

Khanmigo's maths errors are real. During one session, it made an arithmetic mistake while walking my son through a problem. An 8-year-old won't catch that. I now sit nearby during Khanmigo maths sessions to double-check. For writing and reading comprehension, this isn't an issue.

Both require supervision. Neither is a babysitter. Synthesis needs less oversight (the AI is more constrained), but Khanmigo's open-ended conversations mean kids can steer off-topic if left alone.

Which should you choose?

Choose Synthesis Tutor if:

• Your child is 5-8 and needs maths-specific help
• They're a visual/hands-on learner
• They can't read fluently yet (voice narration does the heavy lifting)
• Maths anxiety is the main problem (the warm AI personality helps)
• You're willing to invest in a premium product that does one thing very well
• Your child is neurodiverse (strong accessibility features for dyslexia, dyscalculia, ADHD)

Choose Khanmigo if:

• Your child is 9+ and comfortable reading and typing
• They need help across multiple subjects, not just maths
• You want to build independent problem-solving skills (Socratic method)
• Budget matters ($44/year vs $119/year is a notable gap)
• You want maximum parent visibility (full chat history, moderation alerts)
• Your child's school already uses Khan Academy (Khanmigo integrates directly)

Use both if:

• You have multiple kids at different ages (our setup: Synthesis for the 6-year-old, Khanmigo for the 8-year-old)
• Your child needs intensive maths support plus general homework help

The full comparison

The bottom line

These tools aren't really competitors. They're built for different kids at different stages.

Synthesis Tutor is the best AI maths tutor I've found for young kids who need visual, interactive learning. My son's multiplication skills are proof it works. But the pricing ($119/year) is still a big ask compared to Khanmigo, especially when the free trial is only 7 days.

Khanmigo is the best value in AI tutoring. For $44/year, you get an AI tutor across every subject, a writing coach, and parent monitoring tools, all built on Khan Academy's massive free library. For kids 9 and up who can read and type, it's an easy recommendation.

If I had to choose one for each of my kids: Synthesis for my 6-year-old (visual, no reading needed, maths-focused), Khanmigo for my 8-year-old (growing independence, multiple subjects, homework help).

Try both free trials and let your child decide. Their engagement in the first session will tell you everything you need to know.

Read my full Synthesis Tutor review for a deeper look at features, setup, and nine months of testing results.