What is Bulk Domain Similar?

Bulk Domain Similar is a tool that helps you discover companies similar to the ones you specify. Upload a list of domain names and receive a comprehensive list of competitor and related business domains, perfect for market research and competitive analysis.

How does similar domain discovery work?

Our algorithm analyzes multiple factors including industry, company size, business model, and market positioning to identify similar companies. The results include companies that operate in the same space or serve similar customers.

Is Bulk Domain Similar free to use?

Bulk Domain Similar requires a Free account. You can choose the right plan based on your needs. Try it out by uploading a CSV file to preview similar domains before upgrading. Subscriptions can be cancelled at any time.

// bulk operations

Bulk Domain Similar

Upload a CSV of domains and find similar companies for each one at once.

Start Bulk Processing View API

Domains or company namesUp to 5,000 rows a jobCSV, list or rows

domain-similar-list.csv2,500 rows · domains or company namescompleted

Bulk Similar Domains · /bulk/similar2,500 / 2,500

01pendingPOST /v1/bulk/similar201 · { "data": { "id": 1042 } }
02runninglaunch: trueprogress polled with GET /v1/bulk/similar/1042/progress
03completedbulk.completedsigned webhook delivered to your webhook_url

GET /v1/bulk/similar/1042/download?file=fullCharged at the first download · the job expires after 180 days

// 01 · input

The input of a bulk Similar Domains job

Upload a CSV of up to 4 MB in the app, or send a list, rows or a file to POST /v1/bulk/similar. Columns are found from the header row; set a field index to choose one yourself.

POST/bulk/similarColumns

domain_field_index: Domain
company_name_field_index: Company name

POST/bulk/similarOptions

input_type: domain or company; company when the input has a company name column and no domain column
max_emails_per_domain: Addresses per domain: 1, 10 (the default), 20, 50 or 100

// 02 · api

One request starts the job

Create and launch it in one call, then follow its progress or receive a signed bulk.completed event. Each result row is what GET /similar returns.

POST /bulk/similar

curl -X POST "https://api.tomba.io/v1/bulk/similar" \
  -H "X-Tomba-Key: $TOMBA_API_KEY" \
  -H "X-Tomba-Secret: $TOMBA_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name":"Similar Domains job","list":"piedpiper.com\nshopify.com","launch":true,"webhook_url":"https://hooks.example.com/tomba"}'

const res = await fetch("https://api.tomba.io/v1/bulk/similar", {
  method: "POST",
  headers: {
    "X-Tomba-Key": process.env.TOMBA_API_KEY,
    "X-Tomba-Secret": process.env.TOMBA_SECRET_KEY,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "name": "Similar Domains job",
    "list": "piedpiper.com\nshopify.com",
    "launch": true,
    "webhook_url": "https://hooks.example.com/tomba"
  })
});
const { data } = await res.json(); // { id }

import os, requests

res = requests.post(
    "https://api.tomba.io/v1/bulk/similar",
    headers={
        "X-Tomba-Key": os.environ["TOMBA_API_KEY"],
        "X-Tomba-Secret": os.environ["TOMBA_SECRET_KEY"],
    },
    json={
      "name": "Similar Domains job",
      "list": "piedpiper.com\nshopify.com",
      "launch": True,
      "webhook_url": "https://hooks.example.com/tomba"
    },
)
job_id = res.json()["data"]["id"]

POST /bulk/similar

201 Created

{
  "data": {
    "id": 1042
  }
}

Each row, as GET /similar returns it

200 OK

{
  "data": [
    {
      "website_url": "hooli.com",
      "name": "Hooli",
      "industries": "internet"
    },
    {
      "website_url": "endframe.com",
      "name": "Endframe",
      "industries": "computer software"
    }
  ],
  "meta": {
    "total": 2,
    "pageSize": 10,
    "current": 1,
    "total_pages": 1,
    "params": {
      "domain": "piedpiper.com",
      "page": 1,
      "limit": 10
    }
  }
}

// 03 · cost and limits

What a job costs

Nothing is charged to create or launch a job. Its cost is charged once, at the first download of its results.

// billing per row

1 search credit per domain with at least one similar company.

Bulk billing in the docs

Rows: up to 5,000 per job
Jobs created: 15 per day for each type
Running jobs: 2 per type
Downloads: 25 per day for each job
Request size: 4 MB (CSV, list or rows)

// 04 · use it anywhere

Run Similar Domains jobs from the app or your code

The same job, the same credits: upload a file in the app, call the API, or work from a spreadsheet or a no-code tool.

The full request reference: /api/bulk/domain-similar

// customers

Teams that run Similar Domains jobs

We use Tomba to find emails of the right people, helping us reach out and grow our network easily.
Olderico A.F. CavigliaCEO, Strategycapp
Since years, Tomba has provided the most results per search, and it keeps getting better. It recently became one of the most feature-rich tools for our list building.
Steffen BurandtHead of Business Development, Chandler Orchards

// faq

Frequently Asked Questions

Still have questions? Visit the help center

const res = await fetch("https://api.tomba.io/v1/email-finder?domain=piedpiper.com&first_name=Richard&last_name=Hendricks", { headers: { "X-Tomba-Key": process.env.TOMBA_API_KEY, "X-Tomba-Secret": process.env.TOMBA_SECRET_KEY } }); const { data } = await res.json();

import os, requests res = requests.get( "https://api.tomba.io/v1/email-finder?domain=piedpiper.com&first_name=Richard&last_name=Hendricks", headers={ "X-Tomba-Key": os.environ["TOMBA_API_KEY"], "X-Tomba-Secret": os.environ["TOMBA_SECRET_KEY"], }, ) data = res.json()["data"]

{ "data": { "email": "richard@piedpiper.com", "first_name": "Richard", "last_name": "Hendricks", "full_name": "Richard Hendricks", "website_url": "piedpiper.com", "company": "Pied Piper", "pattern": "{first}", "department": "executive", "type": "personal", "position": "CEO", "country": "US", "gender": "male", "twitter": null, "linkedin": "https://www.linkedin.com/in/richard-hendricks", "score": 100, "accept_all": false, "phone_number": true, "verification": { "date": "2025-01-15T10:32:00+01:00", "status": "valid" }, "sources": [ { "uri": "https://piedpiper.com/blog/engineering", "website_url": "piedpiper.com", "extracted_on": "2024-06-01T09:14:07+01:00", "last_seen_on": "2025-01-10T17:02:44+01:00", "still_on_page": true } ], "phone_data": [] } }