CK-12 FlexBook 2.0
CK-12 FlexBook 2.0: A broad, free science platform for schools that want customizable content and classroom tools. Ranked #2 of 25 in Science Learning Software by our editors (9.3/10); pricing: Free plan; best for schools wanting a fully free science platform.
At a glance
- Editor score9.3 / 10
- PricingFree plan
- Best forSchools wanting a fully free science platform
- Free planYes
- Paid fromFree
- Science scopeK-12 science
- Facts checked20 Sep 2026
Where it wins
- Free customizable textbooks with videos, interactives, and practice
- Physics and chemistry simulations plus adaptive personalized questions
- Assignments, progress insights, and LMS grade passback support
Where it doesn't
- Browser-based access only
- Science content is focused on K–12 learning
- Customization and class management are teacher-led
Our verdict on CK-12 FlexBook 2.0
CK-12 FlexBook 2.0 is a browser-based science learning platform for K–12 students, teachers, parents, and schools. Its core offering combines customizable digital textbooks with interactive lessons, embedded videos, practice activities, physics and chemistry simulations, and PLIX interactive learning activities. Teachers can rearrange chapters, add materials, assign content to classes, create quizzes, and monitor student progress. Learners can access FlexBooks and embedded resources on laptops, desktops, Chromebooks, tablets, and mobile devices.
The platform’s main advantage is its breadth at a free price point. Schools can use digital textbooks, guided lessons, adaptive practice with personalized questions, assignments, quizzes, assessments, and student progress insights without moving between separate science tools. The content can be adapted by teachers rather than treated as a fixed textbook, which suits classrooms with different sequences or supplemental materials. This makes FlexBook 2.0 a strong fit for schools seeking one free environment that covers instructional content, practice, assessment, and class management across K–12 science.
Its ecosystem fit is also practical for school deployments. CK-12 FlexBook 2.0 integrates with Google Classroom, Canvas, Schoology, Kiddom, Clever, and ClassLink, including LMS grade passback. The tradeoff is that access is browser-based, so it does not provide a separate desktop or native mobile application. Teachers who want customizable science content, simulations, adaptive practice, and connected classroom workflows should consider it first. Schools seeking a dedicated app experience or a narrower tool focused on only one part of science instruction may prefer a different approach.
Your product? Our editors can test CK-12 FlexBook 2.0 in depth and publish a review, labelled as paid · from $149/mo →
CK-12 FlexBook 2.0 pricing
CK-12 FlexBook 2.0 fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Science scope | K-12 science |
| Interactive simulations | Yes |
| Virtual experiments | Not verified |
| Guided lessons | Yes |
| Assessment tools | Yes |
| Included learners | Not verified |
| Supported platforms | Browser on laptop, desktop, Chromebook, tablet, or mobile device |
| Deployment | Cloud |
| Platforms | Web |
| Support | Email, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 6 integrations: Google Classroom, Canvas, Schoology, Kiddom, Clever, ClassLink |
| Pricing | Free plan |
| Website | ck12.org |
| Facts checked | 20 Sep 2026 |
CK-12 FlexBook 2.0 integrations
CK-12 FlexBook 2.0 lists 6 integrations on its own site.
- Google Classroom
- Canvas
- Schoology
- Kiddom
- Clever
- ClassLink
Alternatives to CK-12 FlexBook 2.0
- ExploreLearning GizmosA broad virtual lab platform for schools that need simulations, lessons, assessment, and reporting.9.4
- Inq-ITSA structured virtual lab platform for assessed, NGSS-aligned science investigations.9.2
- Concord Consortium STEM Learning ToolsA free web collection for simulations, modeling, data analysis, and classroom assessment.9.1
See all CK-12 FlexBook 2.0 alternatives →
CK-12 FlexBook 2.0 vs the competition
- CK-12 FlexBook 2.0 vs ExploreLearning Gizmos
- CK-12 FlexBook 2.0 vs Inq-ITS
- CK-12 FlexBook 2.0 vs Concord Consortium STEM Learning Tools
- CK-12 FlexBook 2.0 vs Discovery Education Science Techbook
- CK-12 FlexBook 2.0 vs LabXchange
- CK-12 FlexBook 2.0 vs PhET Interactive Simulations
Compare CK-12 FlexBook 2.0 with any tool side by side →
Also Ranked In
CK-12 FlexBook 2.0 is ranked in 6 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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