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Hunter.io

by Hunter.io

★5.0

421 reviews

Email finding and verification platform that helps find and verify professional email addresses for outreach campaigns

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📌Key Takeaways

  • 1Hunter.io is a ai sdr AI agent by Hunter.io, founded in 2015.
  • 2Email finding and verification platform that helps find and verify professional email addresses for outreach campaigns
  • 3Top strengths: Domain Search: Domain Search enables users to discover all publicly available email addresses associated with any company domain in seconds. The feature crawls and i...; Email Finder: The Email Finder tool takes a person's full name and company domain as inputs and returns their professional email address with a confidence score ind....
  • 4Rated 5.0/5 based on 421 reviews.

Category

AI SDR

Founded

2015

Overview

Hunter.io stands as one of the most trusted B2B sales intelligence platforms in the market, serving over 5 million users worldwide who rely on its powerful email finding and verification capabilities to fuel their outreach efforts. The platform has established itself as an essential tool for sales teams, recruiters, marketers, and business development professionals who need accurate contact information to connect with decision-makers at target companies. At its core, Hunter.io solves one of the most persistent challenges in B2B sales and marketing: finding verified professional email addresses at scale. The platform combines sophisticated web crawling technology, proprietary algorithms, and multiple data validation sources to deliver email addresses with industry-leading accuracy. Unlike basic email guessing tools that simply combine name patterns with domain names, Hunter.io actually verifies that email addresses exist and are deliverable, processing billions of verification requests annually. The platform offers three primary capabilities that work together seamlessly. The Domain Search feature allows users to find all email addresses associated with a specific company domain, revealing the email patterns used by organizations and providing confidence scores for each result. The Email Finder takes a person's name and company domain to identify their specific professional email address. The Email Verifier validates any email address in real-time, checking for deliverability, detecting catch-all domains, and identifying risky addresses that could harm sender reputation. Hunter.io integrates natively with popular CRM platforms including Salesforce, HubSpot, and Pipedrive, enabling sales teams to enrich contact records and streamline prospecting workflows without leaving their existing tools. The platform also offers a robust API that processes millions of requests daily, allowing developers to build email finding and verification directly into their applications. Browser extensions for Chrome and Firefox make it easy to find emails while browsing LinkedIn profiles or company websites. What truly differentiates Hunter.io is its commitment to data quality and compliance. The platform maintains strict GDPR compliance, only indexes publicly available professional email addresses, and provides transparency about data sources. This ethical approach to data collection has made Hunter.io the preferred choice for enterprise organizations with strict compliance requirements. The combination of accuracy, ease of use, extensive integrations, and ethical data practices has established Hunter.io as the gold standard for professional email discovery and verification.

🎯 Key Differentiator

AI-Extracted

Email Finder with 99.5% accuracy verification - discovers professional email addresses directly from company domains with real-time mail server validation and confidence scoring

Hunter.io maintains a 99.5% accuracy rate on email verification through real-time validation against mail servers, processing millions of verification requests daily. The platform's database contains over 500 million verified professional emails, making it one of the largest in the industry. Each result includes confidence scores and source attribution, providing transparency that competitors often lack. Independent reviews on G2 and Capterra consistently cite Hunter.io's accuracy as a key differentiator, with users reporting significantly lower bounce rates compared to alternative solutions.

This differentiator was AI-extracted from competitive research.

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Last verified: January 27, 2026

Key Features

Domain Search

Domain Search enables users to discover all publicly available email addresses associated with any company domain in seconds. The feature crawls and indexes billions of web pages to find email addresses that have been published online, then organizes them by department, seniority level, and confidence score. Users can filter results to find specific roles like marketing directors or engineering managers, making it easy to build targeted prospect lists. The system also reveals the email pattern used by each organization (e.g., firstname.lastname@company.com), allowing users to predict email formats for contacts not yet in the database. Build comprehensive prospect lists for any target company in minutes rather than hours of manual research.

Email Finder

The Email Finder tool takes a person's full name and company domain as inputs and returns their professional email address with a confidence score indicating reliability. The system searches Hunter.io's massive database of indexed emails, applies pattern matching based on the company's known email format, and validates the result through multiple verification checks. When a direct match isn't found, the tool provides the most likely email format based on patterns observed at that organization. Each result includes source information showing where the email was originally found online, providing transparency and enabling users to assess data freshness. Find any professional's email address in seconds with confidence scores that indicate deliverability likelihood.

Email Verifier

Hunter.io's Email Verifier performs comprehensive validation on any email address through a multi-step verification process that checks format validity, domain existence, mail server configuration, and mailbox deliverability. The system identifies risky email types including catch-all domains that accept all emails regardless of validity, role-based addresses like info@ or sales@, and disposable email addresses. Each verification returns a detailed status including deliverability rating, risk assessment, and specific flags for potential issues. The verifier processes requests in real-time with sub-second response times, making it suitable for both individual lookups and bulk verification of large lists. Protect sender reputation and improve deliverability by eliminating invalid, risky, and undeliverable email addresses before sending.

Bulk Operations

Hunter.io supports bulk operations for all core features, allowing users to upload CSV files containing thousands of domains, names, or email addresses for batch processing. The bulk Domain Search finds emails for hundreds of companies simultaneously, while bulk Email Finder processes lists of names and companies to return verified contact information. Bulk Email Verification can validate lists of up to 300,000 emails per file, with results typically delivered within hours depending on list size. All bulk operations include detailed reporting with success rates, confidence scores, and exportable results that integrate directly with CRM systems and email marketing platforms. Scale prospecting efforts by processing thousands of lookups simultaneously rather than one at a time.

Chrome Extension

The Hunter.io Chrome Extension brings email finding capabilities directly into the browser, enabling users to find email addresses while visiting any website or LinkedIn profile. When browsing a company website, the extension displays all known email addresses for that domain with a single click. On LinkedIn, it extracts the person's name and company to find their professional email address instantly. The extension also integrates with Gmail, allowing users to verify email addresses and access Hunter.io data without leaving their inbox. All lookups sync automatically with the user's Hunter.io account, maintaining search history and deducting from monthly quotas appropriately. Find and verify emails without leaving your browser, seamlessly integrating prospecting into existing workflows.

Pros & Cons

Pros

  • +Domain Search: Domain Search enables users to discover all publicly available email addresses associated with any company domain in seconds. The feature crawls and i...
  • +Email Finder: The Email Finder tool takes a person's full name and company domain as inputs and returns their professional email address with a confidence score ind...
  • +Email Verifier: Hunter.io's Email Verifier performs comprehensive validation on any email address through a multi-step verification process that checks format validit...
  • +Bulk Operations: Hunter.io supports bulk operations for all core features, allowing users to upload CSV files containing thousands of domains, names, or email addresse...
  • +Chrome Extension: The Hunter.io Chrome Extension brings email finding capabilities directly into the browser, enabling users to find email addresses while visiting any...

Cons

  • −Learning curve for advanced automation features - optimal configuration may require experimentation and iteration.
  • −Data accuracy varies by region - international markets may have less comprehensive or current contact information.
  • −AI-generated content requires human review to ensure accuracy and brand voice consistency.

Use Cases

Explore all AI SDR use cases →

AI SDR: Automated Outbound Prospecting→

Sales teams spend hours manually researching prospects, finding contact information, and crafting personalized outreach messages. This manual process limits the volume of outreach and reduces time available for high-value activities like closing deals.

Lead Qualification and Scoring→

Sales reps waste time chasing unqualified leads, resulting in low conversion rates and inefficient resource allocation. Manual lead scoring is inconsistent and doesn't adapt to changing buyer signals.

Frequently Asked Questions

Hunter.io stands as one of the most trusted B2B sales intelligence platforms in the market, serving over 5 million users worldwide who rely on its powerful email finding and verification capabilities to fuel their outreach efforts. The platform has established itself as an essential tool for sales teams, recruiters, marketers, and business development professionals who need accurate contact inform...
Hunter.io offers: Domain Search: Domain Search enables users to discover all publicly available email addresses associated with any c. Email Finder: The Email Finder tool takes a person's full name and company domain as inputs and returns their prof. Email Verifier: Hunter.io's Email Verifier performs comprehensive validation on any email address through a multi-st. Bulk Operations: Hunter.io supports bulk operations for all core features, allowing users to upload CSV files contain. Chrome Extension: The Hunter.io Chrome Extension brings email finding capabilities directly into the browser, enabling.
1. Domain Search: Domain Search enables users to discover all publicly available email addresses associated with any company domain in seconds. The feature crawls and i... 2. Email Finder: The Email Finder tool takes a person's full name and company domain as inputs and returns their professional email address with a confidence score ind... 3. Email Verifier: Hunter.io's Email Verifier performs comprehensive validation on any email address through a multi-step verification process that checks format validit...
1. Learning curve for advanced automation features - optimal configuration may require experimentation and iteration. 2. Data accuracy varies by region - international markets may have less comprehensive or current contact information. 3. AI-generated content requires human review to ensure accuracy and brand voice consistency.
Hunter.io was founded in 2015. The company has raised Bootstrapped/Profitable. This varies based on your specific requirements, industry, company size, and use case. For detailed information tailored to your situation, consult with the vendor or implementation partner who can provide guidance based on their experience with similar organizations. Most providers offer demos, trials, or consultations to help you evaluate fit before committing.
Common use cases for Hunter.io include: Domain email search, Email verification. This functionality is designed to streamline workflows and improve efficiency. Features may include automation, analytics, reporting, and collaboration tools. Specific capabilities depend on the plan level and product version you choose. Advanced features may require add-ons or enterprise plans.
Email Finder with 99.5% accuracy verification - instantly identifies professional email addresses from company domains with real-time validation. Hunter.io claims a 99.5% accuracy rate for email verification, processing billions of verification requests annually. The platform uses proprietary algorithms combining multiple data sources including web crawling, pattern recognition, and SMTP validation to verify emails in real-time. This accuracy rate significantly exceeds industry averages, with independent tests confirming Hunter.io's superior deliverability rates compared to competitors like Snov.io and FindThatLead.
Hunter.io serves various industries including: SaaS & Technology, Recruiting & Staffing, Marketing Agencies, Financial Services, Real Estate. Hunter.io serves as an essential prospecting tool for SaaS sales teams who need to reach technical decision-makers at target companies. The platform's ability to find verified email addresses for specific roles like CTOs, VP of Engineering, and IT Directors enables precise targeting for software sales. Technology companies particularly benefit from TechLookup, which identifies prospects already using complementary or competing technologies, enabling highly relevant outreach based on existing tech stack.

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