Best B2B Data Providers for Close

Lead411 provides company intelligence and accurate contact data with direct dials and email addresses. It also offers a sales cadence tool that automates your email/sms outreach.

Reply.io combines AI automation, real-time data, and multichannel engagement to help modern sales teams generate, nurture, and convert leads at scale. The platform’s advanced database of over 1 billion B2B contacts allows users to discover ideal prospects using audience targeting and enrichment tools. Through AI-driven personalization, users can craft dynamic email sequences, automate LinkedIn messages, and even send follow-up calls or SMS from one unified dashboard. Its flagship Jason AI SDR agent autonomously handles outreach—analyzing data, generating messages, and scheduling meetings on behalf of the team. Reply.io’s robust email deliverability suite ensures that every message reaches the right inbox with features like domain warm-ups, spam prevention, and reputation tracking. Sales teams can manage every stage of the pipeline—discovery, engagement, and conversion—without switching tools. Seamless integrations with CRMs, calendars, and marketing platforms make it easy to sync activities and track performance. With over a decade of innovation, Reply.io remains the go-to automation partner for businesses looking to humanize and scale sales outreach through AI.

Clay is a go-to-market automation platform that combines business data enrichment, artificial intelligence, and workflow orchestration for sales and marketing teams. The software provides access to more than 200 data providers and enrichment tools for retrieving professional contact details, firmographic information, technographic data, and buying signals. Its waterfall enrichment functionality searches multiple providers sequentially to identify missing information and improve data coverage. Claygent uses AI-powered web research to investigate companies, identify relevant business information, and generate insights for prospecting and account qualification. The platform supports lead sourcing, account segmentation, territory planning, inbound lead routing, and automated outbound sales workflows. Users can create custom enrichment processes, apply lead scoring rules, and monitor signals such as job changes, hiring activity, and company developments. Clay integrates with CRM platforms such as Salesforce and HubSpot to synchronize enriched records and automate customer database maintenance. Its workflow tools support conditional logic, scheduled execution, webhooks, and AI agents for coordinating multistep GTM processes. Clay also provides tools for building advertising audiences, personalizing outreach, and connecting sales activities with external applications and data sources.