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Synthesis

PaidEducation Last updated: May 31, 2026

Synthesis is an adaptive AI math tutor for children ages 5–11 covering K-5 curriculum, founded at SpaceX by Josh Dahn with Elon Musk in 2014.

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Our General Score

8.3/10
Functionality8.8
Features8.0
Usability9.0
Value9.2
Integrations5.5
Reliability7.5

Plans & Pricing

Use Cases

Education

9.2

Adaptive AI K-5 math curriculum built on DARPA Digital Tutoring research with multimodal lessons, adaptive wrong-answer handling, and Dr. James Tanton's curriculum covers the full elementary math learning workflow for up to 7 children per family plan, with weekly AI-generated parent progress reports replacing manual tracking.

Personal Productivity

8.0

Weekly AI-generated progress summaries with accuracy and fluency data eliminate parental session monitoring overhead, and the gamified interface documented to drive voluntary child engagement reduces the effort required to maintain consistent daily math practice without reminders.

Platforms

WebiOSDesktop

Capabilities

Context WindowN/A
API PricingN/A
Image Generation✗ No
Memory Persistence✓ Yes
Computer Use✗ No
API Available✗ No
Multimodal✓ Yes
Open Source✗ No
Browser Extension✗ No

Overview

Synthesis is an AI-powered K-5 math tutoring platform for children ages 5–11 built on DARPA's Digital Tutoring research with a curriculum designed by Dr. James Tanton (PhD Princeton). The AI tutor adapts to each child's pace through multimodal interaction including games, puzzles, and interactive lessons covering visual, auditory, and tactile learning modes. Plans are Monthly ($20/month, up to 7 children) and Annual ($99/year, up to 7 children, ~$8.25/month effective). A 7-day free trial requires no credit card. A free classroom tier is available at synthesis.com/educators. Synthesis is fully AI-based with no human tutors. The platform is English only and available on iPad, desktop, and Chromebook; Android tablet support is in development. COPPA compliant.

Key Features

  • Adaptive AI math tutor built on DARPA Digital Tutoring research adjusting to each child's pace and wrong-answer patterns in real time
  • K-5 curriculum designed by Dr. James Tanton (PhD Princeton) covering arithmetic through algebra foundations across 50+ interactive lessons
  • Multimodal learning through games, puzzles, and visual-auditory-tactile lesson formats suitable for neurodiverse learners including those with dyslexia and dyscalculia
  • Weekly AI-generated parent progress reports showing accuracy, fluency, and skill development without requiring parents to monitor individual sessions
  • Family plans supporting up to 7 child profiles per single monthly or annual subscription
  • Free classroom tier for K-5 educators providing adaptive AI math tutoring without per-student or district licensing fees

Pros & Cons

Pros

  • Annual plan at $99/year covering up to 7 children reduces per-child cost to approximately $14/child/year — lower than Khanmigo's $44/year per single learner or Duolingo Max's $168/year single-user rate
  • Children engage voluntarily without parental reminders per consistent parent testimonials, reducing the household management overhead of maintaining consistent daily math practice
  • 7-day free trial with full platform access and no credit card required enables genuine evaluation of child engagement and learning outcomes before any financial commitment
  • Free classroom tier provides K-5 teachers access to adaptive AI math tutoring for students at no cost, without requiring district enterprise procurement or per-student licensing

Cons

  • English only — children learning in non-English speaking households or school systems cannot use Synthesis regardless of subscription plan
  • No Android tablet support at launch — available on iPad, desktop, and Chromebook only; Android tablet listed as in development without a confirmed release date
  • Fully AI-based with no human tutor option — children requiring one-on-one human relationship, targeted emotional support, or expert intervention for learning challenges cannot access it through Synthesis
  • Single-child families pay $20/month ($240/year) for one learner — higher per-child cost than Khanmigo at $44/year for a single learner, narrowing the value advantage for households with one child

Who It's For

Best For

  • Families with 2–7 children ages 5–11 where the $99/year plan distributes cost across multiple children to below $20/child/year
  • Homeschooling parents who need a structured adaptive K-5 math curriculum children engage with voluntarily, with weekly AI progress reports replacing parental assessment effort
  • K-5 classroom teachers who need free adaptive AI math practice for students outside classroom hours without district procurement or per-student licensing
  • Children with neurodiverse learning needs (dyslexia, dyscalculia, ADHD) for whom parent testimonials document meaningful improvement with multimodal AI approach

Not Ideal For

  • Single-child families for whom Khanmigo at $44/year per learner is significantly cheaper and covers all K-12 subjects beyond only K-5 math
  • Children outside ages 5–11 — Synthesis K-5 math scope excludes middle school, high school, and adult learners at any plan level
  • Non-English-speaking families for whom English-only platform support makes the tool inaccessible regardless of plan
  • Schools or districts requiring Clever, ClassLink, or LMS integration, administrative dashboards, or district-level compliance reporting beyond the basic classroom tier

Audience Scores

Students9.2

Annual plan at $99/year covers up to 7 children — equivalent to approximately $14/child/year for a full family — below Khanmigo's $44/year per single learner; adaptive wrong-answer handling ensures children at all levels progress without being left behind.

Educators8.5

Free classroom tier at synthesis.com/educators gives K-5 teachers adaptive AI math tutoring for students at no cost without district licensing, and weekly AI parent summaries reduce teacher reporting workload for communicating individual student progress.

Small Business5.5

Synthesis is designed exclusively for K-5 children's math education and provides no functionality relevant to any small business workflow or professional productivity use case.

Freelancers6.5

Freelancers with multiple children ages 5–11 can access Annual at $99/year covering up to 7 children, providing household math tutoring below competing platforms — but Synthesis delivers no professional or freelance workflow value outside family education.

Compares With

Khanmigo

Socratic K-12 AI tutoring across math, science, reading, and test prep at $44/year per learner — cheaper for single-child households than Synthesis Monthly, but no family multi-child plan and limited to supported US billing territories

Compare →

Often Used With

Khanmigo

used as a complementary tool for older children (grades 6–12) who have aged out of Synthesis's K-5 scope and need AI tutoring across higher-level math and other subjects

Consider These Instead

When Not To Choose Synthesis

Choose Khanmigo over Synthesis when a single child needs AI tutoring across all K-12 subjects including science, reading, and SAT/ACT preparation beyond K-5 math only — Khanmigo at $44/year per learner costs less than Synthesis Monthly ($240/year) for a one-child household. Choose MagicSchool AI over Synthesis when the primary user is a K-5 teacher who needs AI tools for lesson planning, rubric creation, IEP generation, and classroom content creation alongside student practice. Choose Brighterly over Synthesis when one-on-one human tutoring with a vetted teacher, personalized relationship-based instruction, and parent communication through a real educator are required despite the higher per-session cost.

Integrations

IpadDesktop (Mac/windows)ChromebookSynthesis.com/educators (Classroom)Ios App StoreWeb Browser

Known Limitations

feature gapecosystem weaknessreliability riskaccuracy variability