Seamless.AI vs SignalHire

Seamless.AI is a real-time search engine for B2B lead and contact prospecting, available on web, through an extension, and by API. It searches the public web to find and validate contact information; the listed contact database size is 1,300,000,000. Prospector uses dynamic filters to find verified emails and mobile phones for B2B buyers. Buyer Intent highlights prospects actively buying a product, while Job Changes tracks decision-makers changing jobs. CRM Enrich adds information to CRM records, and outreach features cover email, calls, and social channels, including email sending and an AI-powered phone dialer. The integrations page names Salesforce, HubSpot, Microsoft Dynamics, Outreach, Salesloft, Zoho CRM, and Pipedrive, with availability and capabilities varying by integration and plan. The free plan costs nothing for one user and 50 credits. Pro lists unlimited exports, while Enterprise lists unlimited users and exports; neither plan has a listed price. API key access is available on business plans, with eligibility and pricing details available from sales. The company says it refunds a credit automatically for an invalid email.

SignalHire is a contact search and enrichment service for recruiters, sales professionals, and marketers. It provides professional email addresses and phone numbers, including direct-dial data, and lets users filter profiles by name, title, company, and location. Its database page describes more than 900 million professional profiles and more than 30 million companies. Users can enrich up to 1,000 profiles at a time, and SignalHire says it checks emails with third-party verification tools before displaying contact details. The service also offers multi-step email sequences with tracking, reply pauses, send windows, and analytics, using Outlook/Microsoft 365 or a company-domain mailbox. Its API has Person and Search endpoints; Company API access is available on request through support. The browser extension can find contact details on social and professional sites, with downloads linked for Chrome, Firefox, Edge, and Opera. Integrations include ATS and CRM tools such as Salesforce, HubSpot, Zoho Recruit, Pipedrive, Recruitee, and Ashby. The Free plan is free and provides 5 credits; installing the extension provides 10 free credits each month. The listed monthly paid plans are $69 a month.