Pricing

$20.00 / 1,000 diff runs

Text Diff API - Compare Two Texts, 0-100 Similarity Score

Text diff and similarity API. Input: two text strings. Output: JSON with line- and word-level diffs, counted additions and deletions, and a 0-100 similarity score. Deterministic, no API key. Pay per result: $0.02 per diff run. Good for dedup and change tracking.

Pricing

$20.00 / 1,000 diff runs

Rating

0.0

(0)

Developer

Anthony Snider

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Monthly active users

10 days ago

Last modified

Text Diff & Similarity

Compare two texts and get a clean diff plus similarity metrics in one call.

Live on the Apify Store — run it instantly or call it as an agent tool via Apify MCP.

What you get

Structured diff — an ordered list of operations [{ type: add | del | equal, value }] at line or word granularity (Myers/LCS).
Similarity score — a 0–100 percentage blending a character-level Levenshtein ratio with token-set Jaccard.
Change counts — added, removed, changed, and equal units.
Bulk mode — pass a pairs array to diff up to 50 text pairs in a single run.

Input

{
  "textA": "The quick brown fox\njumps over the lazy dog.\nGoodbye.",
  "textB": "The quick brown fox\nleaps over the lazy dog.\nHello there.\nGoodbye.",
  "mode": "line"
}

Field	Type	Required	Description
`textA`	string	yes	Original / left text.
`textB`	string	yes	Changed / right text.
`mode`	string	no	`line` (default) or `word` diff granularity.

Bulk: send { "pairs": [{ "textA": "...", "textB": "...", "mode": "word" }, ...] }.

Output

{
  "mode": "line",
  "similarityPct": 74.62,
  "added": 2,
  "removed": 1,
  "changed": 1,
  "equal": 2,
  "levenshteinRatioPct": 64.81,
  "jaccardPct": 84.42,
  "diff": [
    { "type": "equal", "value": "The quick brown fox" },
    { "type": "del",   "value": "jumps over the lazy dog." },
    { "type": "add",   "value": "leaps over the lazy dog." },
    { "type": "add",   "value": "Hello there." },
    { "type": "equal", "value": "Goodbye." }
  ]
}

One dataset item is pushed per text pair.

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