Inspector Tools
Text Similarity Checker
Compare two texts and measure similarity using cosine and Jaccard metrics.
Similarity Metrics Explained
- Cosine Similarity: Measures angle between word frequency vectors (0-100%)
- Jaccard Index: Ratio of shared words to total unique words (0-100%)
- Higher cosine = texts discuss similar topics
- Higher jaccard = texts use more shared vocabulary
Compare two blocks of text and see how much they overlap, with a cosine similarity score, a Jaccard index, and the words they share.
The tool also lists common and unique words, so you can see exactly where two versions of a paragraph diverge — useful for checking paraphrases, comparing drafts, or spotting content reuse.
Both texts are processed in your browser and never uploaded, which matters when the material is unpublished, confidential, or copyrighted.
Frequently Asked Questions
What does a similarity score mean?
Cosine similarity runs from 0 (no shared vocabulary) to 1 (identical word usage), while the Jaccard index measures the size of the shared word set. Scores near 1 mean the texts are very close.
Can I use it to check plagiarism?
It is a quick overlap indicator rather than a full plagiarism-database search. It works best for comparing two texts you already have, such as a draft and a rewrite.
Is my text private?
Yes. Analysis happens entirely on your device.