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| Spec | MIT OpenCourseWare | OpenStax | Udemy |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free | Free | Per-course purchases + Udemy Business |
| Rating | 4.9 (64,000) | 4.8 (42,000) | 4.5 (980,000) |
| Community | 96/100 | 95/100 | 85/100 |
| Tier | featured | featured | featured |
| Best for | courses, mit, lectures, open | textbooks, college, open, courses | courses, video, skills, learning |
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