CK-12
FreeFree K-12 textbooks, simulations, and adaptive practice for math and science
Best for k12 · textbooks · math
Our own editorial score, not public reviews.
Strengths
- FlexBooks textbooks
- Simulations
Skip if
you need a team plan, audit logs, or a phone number to call
CK-12 publishes free FlexBooks, simulations, and practice for K-12 math and science. Assign concepts or read a chapter — a classroom, not a homework dump.
Key features
- FlexBooks textbooks
- Simulations
- Adaptive practice
- Teacher assignments
Why it is on Toolora
We list CK-12 for people who need k12 · textbooks · math. Skip it if you need a team plan, audit logs, or a phone number to call.
Closest alternatives on Toolora: IXL, PhET, Prodigy.
Try instead
All CK-12 alternativesIXL
K–12 practice in math, English, and science with skill plans teachers assign
Education & LearningPaid, where CK-12 has a free option.
Also covers math.
Prodigy
A curriculum-aligned math and English game teachers assign for free, with optional parent memberships
Education & LearningAlso covers k12 and math.
CK-12
Free