Hunter.io

Hunter.io is an all-in-one email outreach platform co-founded in 2015 by Antoine Finkelstein and François Grante in Paris, France, designed to help sales teams, recruiters, and marketers find, verify, and email any professional in seconds. It combines a Domain Search, Email Finder, Email Verifier, B2B Discover database, and a built-in cold email Sequences tool in a single platform used by 6 million+ professionals worldwide. Hunter is self-funded, GDPR-compliant, and powers contact data features for products like SparkToro.

• Domain Search — Returns every publicly indexed email address for any company website, complete with names, job roles, LinkedIn profile links, and a confidence score; Bulk Domain Search finds emails for up to 10 addresses per credit.

• Email Finder — Enter a name and company or domain to surface the most likely verified professional email address, with a confidence score; no credit charged if Hunter can't find a match.

• Email Verifier — Checks any email address for validity and deliverability in real time; 0.5 credits per verification with no charge if the result is unknown; available as Bulk Email Verifier for large list cleaning.

• Sequences (Cold Email Campaigns) — Build multi-step personalized email campaigns sent from your own Gmail, Google Workspace, or Outlook account; includes A/B testing, email account rotation, open and click tracking, custom tracking domain, link tracking, evergreen sequences, and reply management.

• AI Writing Assistant & AI Discover Assistant — Generates and optimizes cold email copy using AI; the Discover AI Assistant lets you describe your target audience in natural language and surfaces matching companies and contacts from Hunter's B2B database.

• Signals — Real-time intent and trigger signals (job changes, funding rounds, new hires) that alert you when target companies or contacts are most likely to engage; unlimited Signals on Scale and Enterprise plans.

• Leads & Contact Management — Store, organize, tag, and export leads with up to 30 million saved leads on the Scale plan; includes lead enrichment on paid plans to auto-fill missing contact properties.

• MCP Server & Full API — Hunter's Model Context Protocol server connects the platform to AI agent workflows for programmatic prospecting; the full API is available on all plans for custom integration into any sales or marketing stack.

Hunter.io is built for any professional who needs accurate email contact data fast and wants to move from discovery to outreach without switching tools.

• SDRs and outbound sales reps — use Domain Search and Email Finder to build prospect lists from target company websites in minutes, then launch Sequences directly from the same dashboard without exporting data.

• Recruiters and talent sourcers — find verified email addresses for candidates and hiring managers at target companies faster than any manual research method, and reach out via personalized email sequences at scale.

• Content marketers and SEO link builders — identify the right editorial contact at any domain instantly and run structured outreach campaigns with open and reply tracking to manage the full link building pipeline.

• Freelancers, consultants, and startup founders — use the free plan to test the quality of Hunter's data on their niche before scaling, and upgrade only when monthly volume demands it.

Hunter.io has spent a decade refining what it does better than anyone else: delivering accurate, publicly sourced email data at scale — with a fairness model and compliance approach that most data tools don't match.

• No-Find, No-Charge Credit Model — Hunter only charges a credit when it successfully finds or verifies an email. If no email is found, or if verification returns ‘Unknown,' zero credits are consumed. This is a fundamentally fairer model than competitors that charge per query regardless of outcome, and it makes Hunter's effective cost-per-lead significantly lower than its nominal pricing suggests.

• GDPR-Compliant Public Web Indexing — Hunter exclusively indexes email addresses that have been made publicly available on the web by the email owner or their employer. This compliance-first approach has made Hunter the preferred choice for EU-based organizations and any team with a legal team scrutinizing their data sourcing practices — a non-trivial advantage over scraping tools.

• MCP Server on All Plans — Hunter launched a Model Context Protocol server available across all subscription tiers, enabling AI agents to query the Email Finder, Email Verifier, and Domain Search programmatically. This is a forward-looking infrastructure investment that positions Hunter as a foundational data layer for AI-orchestrated GTM workflows — not just a standalone web app.

• Decade-Long Data Network Effect — Hunter has been indexing public web email data since 2015, giving it one of the deepest historical email databases of any tool in its class. When a company has any indexed online presence, Hunter's decade-long crawling history gives it a materially higher hit rate than newer tools building their indexes from scratch.

Hunter.io integrates directly with the CRMs, automation platforms, and productivity tools where sales and marketing teams do their daily work.

• HubSpot, Salesforce, Pipedrive & Zoho CRM (Native) — Sync Hunter leads, deals, and email sequence activity (opens, clicks, replies) bidirectionally with all four major CRMs; HubSpot integration auto-creates deals for new contacts and tracks cold email activity directly inside HubSpot records.

• Zapier & Make (Workflow Automation) — Connect Hunter's Email Finder, Email Verifier, and Sequences to 5,000+ apps via Zapier for automated lead routing, CRM updates, and notification workflows; Make (Integromat) integration enables multi-step automation sequences with conditional logic.

• Google Sheets Add-On — Find and verify email addresses directly inside a Google Sheets spreadsheet using Hunter's native add-on; supports bulk operations for list enrichment without leaving the spreadsheet environment.

• Chrome Extension & Full API + MCP Server — The Chrome Extension surfaces email addresses on any website with one click; the full API (available on all plans) and MCP server enable developers to build Hunter's find, verify, and search capabilities into any custom application, AI agent, or GTM automation stack.

Hunter.io is the most proven and widely adopted email finder on the market — and after a decade of use by 6 million professionals, it still earns its position as the default starting point for anyone building a cold outreach stack. The combination of a fair no-find-no-charge credit model, GDPR-compliant data sourcing, a permanently free tier, and a fully integrated find-verify-sequence workflow makes it uniquely accessible and trustworthy.

Teams that need LinkedIn enrichment, mobile data, or enterprise-scale sequencing will need supplementary tools, but for accurate email discovery and clean cold email outreach, Hunter remains the category benchmark.