Citizendium vs World Book Online
| Citizendium | World Book Online | |
|---|---|---|
| Free plan | No | |
| Paid from | $20.83/mo | |
| Platforms | Web | Android, iOS, Web |
| Free plan | Yes | No |
| Citation tools | Yes | Yes |
| Content formats | text | multimedia and interactive |
| Update frequency | not stated | continuous |
| Educator resources | Yes | |
| Institutional access | Yes | |
| Mobile apps | Yes |
Listed together in Best Online Encyclopedias