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I suspect they are using https://languagetool.org/ https://languagetool.org/ as a back-end, at least for some parts of the grading. LanguageTool has chrome add
by myth_drannon 13y ago
I suspect they are using https://languagetool.org/ https://languagetool.org/ as a back-end, at least for some parts of the grading.
LanguageTool has chrome addon and a public API.