Word Frequency Checker

The Word Frequency Checker analyzes any text you paste and color-codes every word by its CEFR proficiency level (A1 through C2). This helps language learners quickly assess whether a text is at their reading level before investing time in it.

Each word is looked up in a curated frequency dictionary of approximately 3,500 words per language. The tool calculates the percentage of words at each CEFR level and estimates the overall difficulty of the text. Words not found in the dictionary are marked as "Unknown" — these may be proper nouns, very rare words, or inflected forms.

Research in second language acquisition shows that readers need to understand at least 90-95% of words in a text for comfortable reading and natural vocabulary acquisition. This tool helps you find texts in that sweet spot — challenging enough to learn from, but not so difficult that comprehension breaks down.

Each language has a curated frequency dictionary of approximately 3,500 words organized by CEFR level. Words are assigned to levels based on approximate frequency rankings: the most common ~500 words are A1, the next ~500 are A2, and so on through C2.

The word lists were curated to approximate frequency rankings informed by established corpora and frequency research. They are not direct exports from any single corpus. The tool analyzes base word forms; conjugated or inflected forms may not always be recognized.

This is a guidance tool for language learners. Results are approximate and depend on the coverage of the frequency dictionary.