ZoomInfo is a powerful, enterprise focused lead generation platform. Its contact database is one of the largest we've seen with over 425M records, nearly double that of Apollo's. Its prospecting interfaces were the most granular and powerful of any tool we've tested, with a strong focus on timely datasets such as recent scoops and job changes. Additionally, its integrations list and workflows features are rich and well executed.
However, it lacks any in-built email sequencing functionality, which means you'll need to combine ZoomInfo with another engagement tool for the actual outreach. As such, ZoomInfo is best suited to large enterprises with a very high monthly prospecting volume who already have a pre-existing CRM/engagement stack in place.