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Wiktionary. Headwords, pronunciation, gender, plurals, verb forms, translations, definitions, word origins, idioms and word families come from the English, German, French and Portuguese editions of Wiktionary, read from the extracts published by kaikki.org (Wiktextract). Text by the Wiktionary contributors, licence CC BY-SA 4.0. The data was selected, merged and reformatted for this app and is shared under the same licence.
Tatoeba. Example sentences and their translations come from Tatoeba, licence CC BY 2.0 FR. Rest the pointer on a sentence to see its Tatoeba number and author.
FrequencyWords. Word frequencies come from FrequencyWords by Hermit Dave, counted from the OpenSubtitles 2018 corpus. Licence CC BY-SA 4.0 for the lists.
Written by AI. The language level (A1 to C2), the Swiss German form, the common mistake and the notes were written by Claude (Anthropic), as were the entries carried over from the first version of this app. They are not checked against a printed dictionary. Swiss German has no fixed spelling, so those forms are approximate.
Fonts. EB Garamond (Georg Duffner and Octavio Pardo), Cormorant Garamond (Christian Thalmann), Source Serif 4 (Adobe), IBM Plex Sans and IBM Plex Mono (IBM Corp.), licence SIL Open Font License 1.1. They are part of the app, so nothing is loaded from the internet.
Learner helpers. False friends, the gender tips from word endings and the regional word list were written by Claude (Anthropic); each gender tip is shown only where the app's own data confirms it for at least 80 % of the nouns. Levels marked ≈ are estimated from word frequency.
Built by rule. Tables of forms and the regular or irregular labels are computed from the Wiktionary forms.
Under "More about this word" every card lists where its own content comes from.