Best B2B Data Providers for FirstQuadrant

Apollo is the platform for your entire end-to-end sales strategy. Sellers and marketers use Apollo to discover more customers in market, connect with contacts, and establish a modern go-to-market strategy.

6sense Revenue AI™, eliminates guesswork and provides the data and visibility your revenue team needs to create and convert high quality pipelines into revenue. 6sense Revenue AI™, which eliminates the time-consuming, expensive guesswork that has plagued B2B revenue departments for decades, drives predictable revenue growth. Maximize every digital investment. Illuminate hidden buyer behavior. Analyze millions upon millions of data points to uncover in-market accounts. You can drive the right action at every moment, across all channels. Many companies want what your offer, but martech systems aren't able to accurately detect buyer interest. The Dark Funnel™ is where this vital, hidden data is kept. 6sense analyzes and illuminates these insights. Automate prospect follow-up with AI-powered conversational email. Sales and marketers can create personalized emails with AI-powered 6sense® Conversational Email to convert prospects into sales meetings.

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.