Text Similarity

Cosine similarity of the word-count vectors of two texts, with shared terms and vector norms.

Levenshtein and Damerau-Levenshtein edit distance (restricted and unrestricted) between two texts, with a 0 to 1 similarity.

Rank up to 50 candidates against a query by Jaro-Winkler, Levenshtein, Dice or cosine, best first, with scores.

Hamming distance between two equal-length strings (text or binary), with the differing positions. Unequal lengths are undefined.

Jaro and Jaro-Winkler similarity of two short strings (names), with matches, transpositions and prefix boost.

Longest common subsequence and longest common substring of two texts, with their lengths and a 0 to 1 ratio.

Original Metaphone (Philips 1990, not Double) phonetic key of an English word, with optional second word to compare.

Dice and Jaccard n-gram overlap of two texts by character or word, as sets and as multisets.

American Soundex code of a name (R163 for Robert), with an optional second name to test whether they sound alike.

Diff of two short texts into equal, deleted and inserted lines or words, with counts and a similarity ratio.