10 Best CK-12 Alternatives & Competitors (2026)

Khan Academy delivers free video lessons, practice exercises, and progress tracking across K-12 science topics. Homeschoolers use it as a Tappity alternative when they want zero-cost access and self-paced mastery rather than ready-made lesson bundles. It covers broader subjects than Tappity but lacks the curated open-and-go weekly structure, requiring parents to assemble sequences themselves. Strengths include adaptive practice and teacher dashboards; the main trade-off is less emphasis on hands-on experiments compared with Tappity's homeschool-focused design.

Mystery Science supplies short video mysteries followed by hands-on activities for elementary students. It serves as a Tappity alternative for families prioritizing engaging experiments over purely digital lessons. The platform offers seasonal units and printable materials that reduce prep time similarly to Tappity, yet it charges a yearly subscription and focuses more on NGSS storylines. Homeschoolers often choose it when they want stronger community discussion prompts and less screen time than app-centric options.

Outschool connects homeschoolers with live online science classes taught by independent educators. It differs from Tappity by offering real-time interaction and customizable schedules instead of static open-and-go courses. Parents pay per class or semester, giving flexibility but higher potential cost. The platform excels for children who thrive with peer discussion or specialized topics, while Tappity remains simpler for independent daily lessons without live components.

Generation Genius provides standards-aligned video lessons and hands-on activities for K-8 science. Homeschool families select it over Tappity when they need clear grade-level progression and printable worksheets. The subscription model includes teacher guides and quizzes that support record-keeping requirements many states impose on homeschoolers. Its strength lies in polished production value and assessment tools, though it offers fewer ready-to-teach daily scripts than Tappity's open-and-go approach.

Time4Learning delivers a full online homeschool curriculum with science modules for preK-12. Families consider it when they want an all-in-one platform instead of Tappity's science-only focus. Automated grading and lesson planning tools reduce parent workload, yet the monthly subscription covers multiple subjects. It provides more comprehensive record-keeping features than Tappity while maintaining self-paced access suitable for varied homeschool schedules.

Science4Us targets K-2 students with interactive digital lessons and offline extension activities. It serves as a Tappity alternative for early elementary homeschoolers seeking colorful, game-like instruction. The subscription grants access to structured units that align with Tappity's open-and-go philosophy but includes more foundational literacy connections. Parents appreciate the built-in assessments, although the scope remains narrower than broader platforms.

Noeo Science sells boxed curriculum packages with books, experiment kits, and schedules for homeschool science. It appeals to families wanting tangible materials rather than Tappity's digital delivery. The program emphasizes living books and notebooking, creating a different pedagogical style. Pricing is one-time per year rather than recurring, suiting long-term planners, though it demands more physical storage and parent reading time than app-based alternatives.

Brilliant provides interactive problem-solving courses in science and math for motivated learners. Homeschoolers use it to supplement or replace Tappity when seeking deeper conceptual challenges instead of broad survey courses. The subscription model and mobile app allow daily practice, but content skews older and more puzzle-oriented. It lacks Tappity's elementary homeschool scripting and hands-on experiment guides, making it better for self-directed middle schoolers.

SchoolhouseTeachers offers downloadable science units and video classes for homeschool families. It functions as a Tappity alternative when parents want printable resources plus optional live webinars at a flat annual rate. Content spans multiple grades and includes record-keeping templates useful for portfolio assessments. The platform's breadth exceeds Tappity's science-only scope, yet lesson pacing is less prescriptive, requiring families to select units themselves.