ForHosting KIT · Developer Utilities

Sørensen–Dice string similarity calculator

The Sørensen–Dice coefficient is a classic fuzzy string similarity measure built from shared character bigrams rather than exact equality or full edit paths.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Given two texts, this calculator extracts every consecutive pair of characters in each string, treats those pairs as multisets, and returns twice the size of their intersection divided by the sum of the two multiset sizes. The score sits between zero and one: identical strings yield one, completely disjoint bigram bags yield zero, and everyday near-matches such as night versus nite or reordered short tokens land in between. Because the method depends on overlapping pairs instead of global alignment, it tolerates minor spelling differences and is less brittle to word order than pure Levenshtein distance when comparing bag-like labels. Students, data engineers, and product teams use it for deduplication hints, search ranking features, and homework checks without standing up a machine-learning stack. The same pure module powers the free browser widget and the API path so goldens and production never disagree.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/dev/dice-coefficient

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/dev/dice-coefficient \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text_a":"night","text_b":"nacht"}'

const res = await fetch("https://api.kit.forhosting.com/dev/dice-coefficient", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "text_a": "night",
    "text_b": "nacht"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/dev/dice-coefficient",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "text_a": "night",
    "text_b": "nacht"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/dev/dice-coefficient", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"text_a":"night","text_b":"nacht"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"text_a":"night","text_b":"nacht"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/dev/dice-coefficient", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "text_a": "night",
  "text_b": "nacht"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "dev.dice_coefficient",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →