CK-12 alternatives
12 products compared · Updated November 2, 2026
The short answer
For a paid, structured K-5 science curriculum with workbooks, choose Tappity. For turning your own notes into study tools across any subject, choose Quizlet. For interactive video lessons that integrate with your LMS, choose Edpuzzle.
Your shortlist, at a glance
Read the comparisons ↓- IIXL LearningNot publishedSchools and families in the U.S. that want a subscription-based practice tool with diagnostics and skill plans aligned to state standards.
- BBrainPOPNot publishedElementary and middle school classrooms that need animated, kid-friendly explanations across multiple subjects.
QuizletNot publishedStudents and teachers who want to convert their own class notes into study tools and need something that works beyond a set curriculum.
- OOpenStaxNot publishedColleges and K-12 districts that want free, adoptable textbooks with LMS integration and optional auto-graded homework.
- SSocratic by GoogleNot publishedStudents who want to point their phone at a problem and get an instant explanation without browsing a full course library.
- PProdigy EducationNot publishedK-8 teachers and schools that want to boost math engagement through gameplay and need standards-aligned content with progress tracking.
EdpuzzleNot publishedTeachers and schools that want to create interactive video lessons and integrate them with their LMS.- SSplashLearnNot publishedTeachers and parents of PreK-5 students who want a fun, game-driven curriculum with progress tracking.
- SStudy.comSee websiteOther
- AAlbert.ioNot publishedTeachers and schools in the US that need test prep and standards-aligned practice for grades 3-12 across multiple subjects.
- GGizmos by ExploreLearningNot publishedSchools and districts that want research-backed, interactive STEM simulations with professional development and student data tracking.
TappityNot publishedHomeschooling families with K-5 kids who want a ready-to-run science curriculum with workbooks and parent tools.
About CK-12 and its alternatives
CK-12 is a free K-12 learning platform from the CK-12 Foundation. It offers textbooks, interactive exercises, and simulations across math, science, and more, all at no cost. The site is known for its broad, standards-aligned library and adaptive practice.
When comparing alternatives, weigh pricing structure (free vs. subscription vs. quote-based), subject and grade coverage, integration with your existing LMS, and whether you need a complete curriculum or just supplemental tools. Also consider the region: some tools are U.S.-focused, while others work globally. Support and contract terms vary, so check if you need sales contact for pricing.
Explore the alternatives
- INot published
1.IXL Learning
Best for: Schools and families in the U.S. that want a subscription-based practice tool with diagnostics and skill plans aligned to state standards.
- Pricing
- Not published
- Category
- Other
IXL Learning is a paid K-12 practice and assessment platform with over 20,000 skills in math, language arts, science, social studies, and Spanish. It offers personalized diagnostics, video tutorials, and games. Choose IXL over CK-12 if you need structured, standards-aligned practice with detailed progress tracking for individual students or classrooms.
Where it is strong
- Over 20,000 skills across five subjects, including Spanish.
- Real-time diagnostic and personalized recommendations for each student.
- Skill plans align with state standards, textbooks, and tests like SAT and ACT.
Where it falls short
- Pricing is not transparent on the site. Requires contacting sales.
- No free tier, unlike CK-12's free resources.
- Pricing:
- Pricing is not published on the site.
- Switching from CK-12:
- Moving from CK-12 to IXL involves switching from free resources to a paid subscription and adapting to IXL's skill-based practice format.
- BNot published
2.BrainPOP
Best for: Elementary and middle school classrooms that need animated, kid-friendly explanations across multiple subjects.
- Pricing
- Not published
- Category
- Other
BrainPOP offers animated videos and interactive activities for K-8 students across science, social studies, English, math, arts, music, health, and technology. Choose it over CK-12 when you want engaging, character-driven content that appeals to younger learners rather than a free, text-heavy resource library.
Where it is strong
- Animated videos make complex topics accessible and fun.
- Covers a broad range of subjects beyond STEM, including arts and health.
- Designed specifically for K-8 age groups.
Where it falls short
- No free tier. Requires a paid subscription.
- Less depth in math and science compared to CK-12's adaptive practice and textbooks.
- Pricing:
- Pricing is not published on the site.
- Not published
3.Quizlet
Best for: Students and teachers who want to convert their own class notes into study tools and need something that works beyond a set curriculum.
- Pricing
- Not published
- Category
- Education
Quizlet turns your own notes, recordings, or typed material into flashcards, practice tests, and games. Choose it over CK-12 when you want to study material you bring yourself, not a fixed K-12 curriculum. It also works for any subject or level, not just school standards.
Where it is strong
- Turns any input into flashcards, quizzes, and games
- Free for teachers and integrates with Google Classroom
- Works on the go with quick reviews and podcasts
Where it falls short
- No built-in K-12 curriculum like CK-12 offers
- Free tier may limit some advanced study modes
- Pricing:
- Pricing is not published on the site.
- Switching from CK-12:
- Moving from CK-12 means bringing your own study material, since Quizlet does not provide a structured curriculum.
- ONot published
4.OpenStax
Best for: Colleges and K-12 districts that want free, adoptable textbooks with LMS integration and optional auto-graded homework.
- Pricing
- Not published
- Category
- Other
OpenStax is a nonprofit publisher of free, peer-reviewed textbooks for college and K-12 courses, with optional paid tools for instructors. Choose it over CK-12 when you need openly licensed, standards-aligned textbooks for higher ed or AP courses, not just K-12 interactive resources.
Where it is strong
- Free, openly licensed textbooks for students, no ads or catch.
- Assignable tool costs $15 per student per course per semester.
- Works with LMS integration and includes auto-graded homework and AI tools.
Where it falls short
- Textbook library is narrower than CK-12's interactive simulations and practice.
- Assignable is paid, while CK-12's core resources are free.
- Pricing:
- Pricing is not published on the site.
- SNot published
5.Socratic by Google
Best for: Students who want to point their phone at a problem and get an instant explanation without browsing a full course library.
- Pricing
- Not published
- Category
- Other
Socratic by Google is a visual search tool that lets you scan homework problems, text, or diagrams with your camera and get explanations. Choose it over CK-12 when you need quick help on a specific question rather than a structured curriculum of lessons and practice exercises.
Where it is strong
- Works from a photo or screenshot, so you can ask about printed or handwritten problems
- Integrated into the Google app and Lens, so it is already on many phones
- Covers a wide range of subjects by searching the web for answers
Where it falls short
- No structured lessons or practice sets like CK-12 offers
- Requires a Google account and the Google app for full functionality
- Pricing:
- Pricing is not published on the site.
- PNot published
6.Prodigy Education
Best for: K-8 teachers and schools that want to boost math engagement through gameplay and need standards-aligned content with progress tracking.
- Pricing
- Not published
- Category
- Other
Prodigy Education turns math and English practice into an adaptive game, with quests and battles that keep kids engaged. Choose it over CK-12 if you want a game-based learning tool that tracks student progress and aligns with Common Core and state standards, while still being free for teachers.
Where it is strong
- Free for teachers with no trial period or hidden costs.
- Adaptive game-based learning that increases math enjoyment and skill mastery.
- Aligns with Common Core, TEKS, and many state-specific standards.
Where it falls short
- Parent memberships are optional but may be needed for full features.
- Less comprehensive than CK-12 for subjects beyond math and English.
- Pricing:
- Pricing is not published on the site.
- Switching from CK-12:
- Moving from CK-12 to Prodigy means shifting from a library of static resources to a game-based adaptive platform, so you'll need to set up classes and introduce students to the gameplay environment.
- Not published
7.Edpuzzle
Best for: Teachers and schools that want to create interactive video lessons and integrate them with their LMS.
- Pricing
- Not published
- Category
- Education
Edpuzzle lets teachers turn any video into an interactive lesson with embedded questions and track student progress. Choose it over CK-12 when you want to build lessons from existing video content rather than use pre-made textbooks and exercises.
Where it is strong
- Create interactive video lessons with embedded questions and notes.
- Integrates with popular LMS platforms for easy assignment and grading.
- Tracks student engagement and performance on each video.
Where it falls short
- No free library of standards-aligned lessons like CK-12.
- Pricing details are not publicly listed, so you must contact sales.
- Pricing:
- Pricing is not published on the site.
- SNot published
8.SplashLearn
Best for: Teachers and parents of PreK-5 students who want a fun, game-driven curriculum with progress tracking.
- Pricing
- Not published
- Category
- Other
SplashLearn is a game-based math and English program for preschool to grade 5, with thousands of games, worksheets, and personalized learning paths. Choose it over CK-12 if you teach younger children and want a more playful, subscription-based experience with live classes.
Where it is strong
- Over 8,000 games and activities for math and English
- Personalized learning path with weekly reports
- Free for teachers to use in school
Where it falls short
- Only covers preschool to grade 5, not older grades
- Limited to math and English, no science or other subjects
- Pricing:
- Pricing is not published on the site.
- SSee website
9.Study.com
Other
Video lessons and study guides for K-12 and college, a paid alternative with broader subject coverage.
- ANot published
10.Albert.io
Best for: Teachers and schools in the US that need test prep and standards-aligned practice for grades 3-12 across multiple subjects.
Albert.io offers rigorous, standards-aligned practice questions for grades 3-12 across many subjects and exams, including AP, ACT/SAT, and state tests. Choose it over CK-12 when you need exam-specific question banks and advanced reporting for teachers, rather than general free K-12 resources.
Where it is strong
- Human-written question banks for AP, ACT/SAT, and state exams
- Adaptive practice subjects are free forever
- Covers many subjects in one platform, including electives and languages
Where it falls short
- Pricing is not transparent on the site
- Free access is limited to adaptive subjects. Full question banks require paid licensing
- Pricing:
- Pricing is not published on the site.
- Switching from CK-12:
- Moving from CK-12 to Albert.io involves shifting from a free, open library to a paid platform with structured question banks and reports, so you'll need to evaluate licensing costs and whether your subjects are covered.
- GNot published
11.Gizmos by ExploreLearning
Best for: Schools and districts that want research-backed, interactive STEM simulations with professional development and student data tracking.
- Pricing
- Not published
- Category
- Other
Gizmos by ExploreLearning provides interactive math and science simulations for grades 3-12, backed by research. Choose it over CK-12 when you need a paid, classroom-focused tool with teacher support and data privacy compliance, rather than free open resources.
Where it is strong
- Interactive simulations for grades 3-12
- Research-proven to drive student achievement
- Includes professional development support
Where it falls short
- Pricing not transparent. Requires quote request
- Focused on STEM only, not broader K-12 subjects
- Pricing:
- Pricing is not published on the site.
- Switching from CK-12:
- Moving from CK-12 to Gizmos involves contacting sales for a quote and likely migrating to a paid, subscription-based model.
- Not published
12.Tappity
Best for: Homeschooling families with K-5 kids who want a ready-to-run science curriculum with workbooks and parent tools.
- Pricing
- Not published
- Category
- Education
Tappity is a paid, structured K-5 science program with interactive lessons, hands-on workbooks, and parent guides. Choose it over CK-12 if you are a homeschooling family that wants a complete, guided science curriculum with physical materials and progress tracking.
Where it is strong
- 500+ hours of curriculum and interest-based courses
- Physical workbooks delivered to your doorstep
- Parent study guides and personalized progress tracking
Where it falls short
- Limited to K-5 science, unlike CK-12's broader K-12 subjects
- Pricing is not transparent on the site
- Pricing:
- In the United States, Tappity offers a free trial, but specific prices are not listed on the pricing page.
- Switching from CK-12:
- Moving from CK-12 means shifting from free, self-serve resources to a paid, structured program with physical materials and a weekly schedule.
See more comparisons in Education alternatives.
FAQ
Questions about CK-12 alternatives
Which alternative is best for homeschooling families?
Tappity is the strongest choice for homeschooling K-5 science. It offers a complete curriculum with 500+ hours of lessons, physical workbooks, and parent guides. It is paid, so you get a structured program rather than a free resource library.
Are there free alternatives to CK-12?
Yes, Quizlet and Socratic by Google are free. Quizlet lets you turn your own notes into flashcards and quizzes, while Socratic gives instant explanations from a photo. Both lack a built-in K-12 curriculum, so they work best as supplements.
Which alternative is best for teachers who want to create video lessons?
Edpuzzle is designed for that. You can turn any video into an interactive lesson with embedded questions and track student progress. It integrates with popular LMS platforms, but pricing requires contacting sales.
Do any alternatives offer free trials or free tiers?
Tappity offers a free trial, and Prodigy Education is free for teachers with no trial period. Albert.io offers adaptive practice subjects free forever. Most others, like IXL and BrainPOP, do not publish pricing and require contacting sales.
Which alternative is best for test prep like AP or SAT?
Albert.io is the best fit. It has human-written question banks for AP, ACT/SAT, and state exams. It covers grades 3-12 across many subjects, but full access requires paid licensing.
Last updated November 2, 2026.