VisibleThread API

visiblethread · Company

Company No Auth Free & Open text

## Introduction The VisibleThread b API provides services for analyzing/searching documents and web pages. To use the service you need an API key. **Contact us at [email protected] to request an API key**. The services are split into **Documents** and **Webscans**. ### Documents Upload documents and dictionaries so you can : - Measure the readability of your document - search a document for all terms from a dictionary - retrieve all paragraphs from a document or only matching paragr

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Get your list of dictionaries

Get your list of dictionaries

https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/visiblethread.com/1.0/dictionaries";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Get your list of documents

Get your list of documents

https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/visiblethread.com/1.0/documents";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Get your list of searches

Get your list of searches

https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/visiblethread.com/1.0/searches";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with VisibleThread API?

VisibleThread API is a Company API. Developers commonly use company APIs for:

enriching CRM records with company firmographics
building lead-generation and prospecting tools
verifying business identity and registration details
monitoring competitors and market intelligence
powering B2B data enrichment pipelines

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. VisibleThread API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide · Learn about API keys · What is REST?

Open documentation ↗