Licenses & sources
Where the content comes from: Wiktionary, a frequency word list, fonts and software libraries.
Wiktionary
CC BY-SASource for word meanings and example sentences.
https://de.wiktionary.orgFrequency word list
Public domain / open dataUsed to rank vocabulary by how common it is.
Google Fonts
SIL Open Font LicenseTypefaces used in the interface.
https://fonts.google.comUI components & libraries
MITOpen-source software used to build the interface.
Speech synthesis
Commercial API, per provider termsUsed for read-aloud audio.
Own content
Lessons, exercises, stories and explanations are our own work unless noted otherwise.