The Common European Framework of Reference for Languages (CEFR or CEF) is a guideline used to describe language ability on a scale of levels from A1 for beginners up to C2 for those who have mastered a language. CEFR can be used as a standard in the process of designing a language online course.
1. The English Vocabulary Profile (EVP) shows which words and phrases learners know at each level (i.e., from A1 to C2) of the CEFR. You can subscribe to the A1-C2 English Vocabulary Profile here, which is available for free for the time being.
Words are also listed according to their CEFR levels in Cambridge Learner’s Dictionary.
2. The English Grammar Profile (EGP) shows which grammatical forms and meanings learners know at each level (i.e., from A1 to C2) of the CEFR. The EGP is available here.
3. The following text inspectors can be used to check the difficulty of any text in terms of the CEFR levels.