Encyclopaedia Universalis vs Klexikon

Encyclopaedia Universalis is an online encyclopedia for reference, teaching and documentary research, with editions for individual subscribers and educational institutions. Its consumer collection contains more than 55,000 articles across subjects including arts, history, law, literature, chemistry and medicine. Subscriptions provide unlimited, ad-free access, along with an Atlas of physical, administrative and location maps, country information and historical views; Données Pays country comparisons; and the Cordial dictionary with 120,000 entries. Comparison limits depend on the number of countries selected: up to 12 with all data, 13–50 with five data points at once, or 51 or more with one data point across at most 25 years. For schools, Universalis Junior serves primary pupils, while Universalis Éducation has secondary and higher-education editions. Education resources include mind maps, country data, a personal space, Open-Dyslexic font and dark mode. Articles are written by authors and professors and reviewed by the editorial team. The service is available on web, Android and iOS. Plans include Découverte at €1 a month, then 10,90 € per month after the first month, and Zen at €79, paid once for two years.

Klexikon is a free German-language online encyclopedia written for children roughly 6 to 14 years old. Its editorial approach favors clear wording, short sentences and content suited to young readers. The project says Klexikon contains more than 3,500 articles, with a further 1,500-plus in MiniKlexikon, where the language is especially simple for beginning readers, German learners and children with additional learning needs. Articles use child-appropriate images from Wikimedia Commons, and the editorial guidance calls for at least one image per article. Some articles also include Tagesschau explanatory videos. The web site is available without a login; the project describes it as ad-free and says it does not collect personal data. Article text uses the Creative Commons Attribution-ShareAlike license, which requires attribution and the same license for reuse. Children may submit article requests, questions or error reports. Adults can apply to contribute by email and normally receive an account after an introductory course; new contributors must be at least 18. Klexikon also offers workshops for school classes with research tips and collaborative article improvement.