Practice that follows the pattern, not the word list.
Kototeka builds language apps around the structures a language actually uses — prefixes, endings, vowel changes, meaning groups — so that what you learn transfers to words you have never seen.
Practice apps
Free to use, in four interface languages.
Dutch articlesFree
De or het, grouped by prefix and suffix, not word by word.
Dutch verbsIn preparation
Irregular verbs grouped by the vowel that changes, not alphabetically.
German verbsIn preparation
Strong verbs by ablaut series, with the auxiliary drilled alongside.
English verbsIn preparation
Irregular verbs sorted by the shape of the change, so the pattern shows.
Japanese verbsIn preparation
Godan, ichidan and the two irregulars, drilled by the stem that changes.