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 the AI-driven data marketplace and orchestration layer that powers modern go-to-market teams. Clay enables teams to find and qualify prospects with AI agents and intent signals, enrich their CRM with best-in-class accuracy and fill rates from 150+ data providers and AI, and orchestrate GTM workflows such as ABM, outbound, and pre-call meeting notes. Over 5,000+ companies, like OpenAI, Canva, Anthropic, and Rippling, use it to power everything from recurring CRM enrichment to targeted outreach. Find accounts with a burning need for your product. Analyze your closed-won list of top customers to narrow your ICP and find lookalikes of your best fit customers from multiple sources. Use AI to build the most sophisticated scoring and qualification logic. Continuously source new qualified leads so sales and marketing teams can continue to take actions such as creating Ads or launching outbound. Enrich with accuracy no single provider can match. Trusted data improves every part of your GTM engine. Clay’s waterfall enrichment approach across 150+ data sources combines multiple providers to result in higher fill rates at lower cost. Automatically run enrichments and sync data directly to your CRM or data warehouse while avoiding duplicates. The results of waterfalling providers speak for themselves: OpenAI doubled their inbound lead enrichment coverage rates and Anthropic tripled their inbound lead match rate. Orchestrate plays that convert accounts from aware to closed. Score accounts by fit and engagement, then build ABM tiers that move prospects through your funnel. When accounts hit intent thresholds—pricing page visits, job changes, webinar attendance—alert reps instantly or trigger multi-channel campaigns at scale including outbound with Clay’s sequencer.