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| Spec | Khan Academy | Wikipedia | Babbel |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free | Free | Subscription, billed monthly or annually |
| Rating | 4.8 (54,000) | 4.7 (120,000) | 4.5 (54,000) |
| Community | 95/100 | 96/100 | 86/100 |
| Tier | featured | featured | verified |
| Best for | courses, maths, free, k12 | encyclopedia, reference, free, research | languages, lessons, speaking, courses |
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