# Hunter.io **Source:** https://geo.sig.ai/brands/hunterio **Vertical:** B2B Data **Subcategory:** Email Prospecting Tool **Tier:** Challenger **Website:** hunter.io **Last Updated:** 2026-04-14 ## Summary Email finder and domain search tool for B2B prospecting. Paris France, bootstrapped, 4M+ users, finds professional email addresses from company domains for sales and recruitment outreach. ## Company Overview Hunter.io is an email finder and domain search tool used by sales, marketing, and recruitment professionals to find professional email addresses for B2B outreach. Founded in 2015 and headquartered in Paris, France, Hunter.io is a bootstrapped company that has grown to over 4 million users without venture capital. Its Domain Search tool finds all email addresses associated with a given company domain, while the Email Finder tool generates a predicted email address for a specific person at a company based on the company's email format.\n\nHunter.io's core tool is its domain search — users input a company domain and receive a list of publicly findable email addresses at that organization along with a confidence score. The email verifier tool checks whether an address is likely deliverable before it is used in an outreach sequence, reducing bounce rates and protecting sender reputation. A Chrome extension enables email discovery directly from LinkedIn profiles and company websites.\n\nHunter.io has built its large user base through a freemium model that provides a limited number of monthly searches at no cost, converting active users to paid plans as their prospecting volumes grow. Its combination of simplicity, accuracy, and free-tier generosity has made it a default first tool for individuals and small teams starting prospecting programs. While it lacks the intent data, firmographic depth, and compliance infrastructure of enterprise B2B data platforms, Hunter.io's focused email finding capability and ease of use have sustained strong growth in the individual and SMB prospecting segment. ## Frequently Asked Questions ### What is Hunter.io's Domain Search? Hunter.io's Domain Search shows all publicly findable professional email addresses associated with a company domain — useful for identifying multiple contacts at a target account for outbound prospecting. ### Is Hunter.io free to use? Yes. Hunter.io offers a free plan with a limited number of monthly searches. Paid plans remove limits and add features like bulk email finding, API access, and campaign tools. ### How accurate is Hunter.io's email data? Hunter.io provides confidence scores with each email address and includes an email verifier tool that checks deliverability before outreach, helping users filter out potentially invalid addresses. ### What is Hunter.io's Email Verifier and why is it important? Hunter.io's Email Verifier checks whether an email address is valid and deliverable before sending — testing the mail server, checking for disposable addresses, and validating format. Verifying emails before outreach reduces bounce rates, protects sender reputation, and improves email deliverability. ### How many email addresses does Hunter.io have in its database? Hunter.io has indexed over 100M professional email addresses from public web sources, with coverage across virtually every major company domain globally. The database is continuously refreshed by re-crawling the web to keep contact data current. ### What are Hunter.io's API capabilities? Hunter.io provides a RESTful API that allows developers to integrate domain search, email finder, and email verification directly into CRMs, sales engagement tools, and prospecting workflows. The API supports bulk operations and is widely used for automating contact list building. ### How does Hunter.io compare to ZoomInfo or Apollo.io? Hunter.io focuses specifically on finding and verifying professional email addresses from public web data, making it simpler and more affordable for outbound prospecting. ZoomInfo and Apollo.io offer broader contact databases with phone numbers, firmographic data, and intent signals, but at significantly higher price points. ### What is Hunter.io's Campaigns feature? Hunter.io Campaigns is an email outreach tool built into the platform that allows users to send personalized cold email sequences directly from Hunter.io without needing a separate sales engagement tool. It includes tracking for opens, clicks, and replies, and supports automated follow-up sequences. ### What is Hunter.io? Hunter.io is a B2B email finding and verification tool that helps sales and marketing professionals find professional email addresses for contacts at target companies — used by over 4 million users for outbound prospecting. ### How does Hunter.io find email addresses? Hunter.io uses a combination of web crawling (finding publicly listed email addresses), algorithmic pattern matching (inferring formats like firstname@company.com), and community data contributions to identify and verify professional email addresses. ### Does Hunter.io offer email verification? Yes. Hunter's email verifier checks whether email addresses are deliverable by verifying SMTP server responses, syntax, and domain validity — helping users clean lists and reduce bounce rates before campaigns. ### What is Hunter.io's pricing model? Hunter.io offers a free plan with 25 monthly searches and 50 verifications. Paid plans start at $49/month for 500 searches and scale to enterprise volumes — making it accessible for small teams while serving large prospecting operations. ### What are Hunter.io's main use cases? Hunter.io is primarily used for outbound sales prospecting, recruiting outreach, PR and journalist contact finding, link building outreach, and partnership development — any workflow requiring finding the right professional contact email. ## Tags saas, b2b, sales, platform, smb, startup, analytics, global --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*