💡 Pick it for a free, structured math curriculum with broad subject coverage.
Khan Academy is a non-profit educational organization that provides free online courses, lessons, and practice.
Best Synthesis by Six Atomic Alternatives ranked by AI · updated Aug 2026
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Synthesis is an online learning platform for children that develops mathematical reasoning, problem solving, and collaborative thinking through interactive challenges. It is aimed primarily at school-age learners and emphasizes open-ended puzzles rather than conventional worksheets or lecture-based lessons.
Top 6 Synthesis by Six Atomic alternatives
2
Beast Academy
Art of Problem Solving
💡 Pick it for a structured, challenging math curriculum with stronger contest preparation.
Beast Academy is a math curriculum for elementary and middle-school students that combines illustrated instruction with challenging problem solving. It is aimed...
Pros
- Much stronger problem-solving depth than Manta Math
- Excellent fit for advanced or mathematically curious students
- Uses comic-style lessons to make challenging concepts approachable
Cons
- More difficult for learners who need basic skills remediation
- Less focused on short, casual game sessions
- Higher price than free resources such as Khan Academy
From $15.99/mo
💡 Pick it for interactive math, science, and programming lessons aimed at older learners.
Brilliant offers interactive problem-solving courses in math, science, and engineering, fostering critical and creative thinking.
Pros
- Challenging problems
- Engaging learning approach
Cons
- Paid subscription required for full access
Paid subscription
💡 Pick it for comprehensive, standards-aligned practice and detailed progress tracking.
Ixl is an online educational platform offering personalized learning for students in K-12. It covers a wide range of subjects and provides...
Subscription-based
5
DreamBox
Discovery Education
💡 Pick it for adaptive, guided math practice that targets individual learning gaps.
DreamBox is an adaptive math-learning platform for elementary and middle-school students. It adjusts lesson difficulty and instructional paths based on student responses...
Pros
- More sophisticated adaptive sequencing than Manta Math
- Provides strong educator and intervention reporting
- Designed around conceptual understanding rather than only answer accuracy
Cons
- Pricing is less accessible and often school-oriented
- Less explicitly game-driven than Manta Math
- Availability and grade coverage vary by plan
6
Art of Problem Solving
Art of Problem Solving
💡 Pick it for rigorous advanced math, competition preparation, and a strong problem-solving community.
Art of Problem Solving provides advanced math courses, textbooks, online classes, and community resources for mathematically motivated middle-school and high-school students. Its...
Pros
- Offers deeper and more rigorous mathematics than Synthesis
- Strong reputation for olympiad and competition preparation
- Includes expert-led courses, textbooks, and an active problem-solving community
Cons
- Steeper learning curve than Synthesis, especially for younger beginners
- Less game-like and less immediately accessible for casual learners
- Not as focused on collaborative gameplay or visual exploration
From $15/mo
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