Side by side
Compare tools
3 tools selected
featured
CK-12
Free K-12 textbooks, simulations, and adaptive practice for math and science
4.6
FreeFree
featured
IXL
K–12 practice in math, English, and science with skill plans teachers assign
4.4
PaidFamily and classroom subsc…
| Spec | CK-12 | IXL | PhET |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free | Family and classroom subscriptions; school licenses | Free |
| Rating | 4.6 (22,000) | 4.4 (42,000) | 4.9 (240,000) |
| Community | 88/100 | 84/100 | 96/100 |
| Tier | featured | featured | featured |
| Best for | k12, textbooks, math, science | k12, practice, math, classroom | simulations, physics, math, classroom |
| Top features |
|
|
|