Vocabulary Coverage Reviewer

How to use Vocabulary Coverage Reviewer

Choose reading material with a transparent view of which literal word segments occur in an authored learning list. The report retains original passage offsets, known-word occurrences and the unlisted inventory. It supports a human teaching decision without claiming that a percentage predicts understanding or measures a learner’s vocabulary.

1. Paste a passage and your own one-segment-per-line vocabulary list.
2. Choose an explicit segmentation locale and exact comparison policies.
3. Inspect covered token counts, original offsets and unlisted words; review phrases and meaning yourself.

Good to know

• At most 50,000 well-formed passage UTF-16 characters, 30,000 vocabulary characters, 1,000 nonempty vocabulary lines and 10,000 retained passage segments. Each vocabulary line is at most 100 characters and must be exactly one letter-containing word-like runtime segment.
• The denominator includes word-like segments containing a Unicode letter; standalone numbers and punctuation are excluded. Original zero-based UTF-16 positions remain unchanged by comparison normalization.
• Comparison uses no normalization or NFC, followed by optional ASCII A–Z lowercasing. No full Unicode case folding, stemming, lemmatization, phrase matching, language detection or automatic translation is performed.
• Zero retained tokens gives null coverage. Percentages round to two decimal places with exact nonnegative half-up arithmetic. Runtime segmentation data may differ between browsers. A listed token is not proof that a reader understands the word or passage.
• Processing is local. Output is limited to 1,000,000 text characters unless a stricter file limit is stated.