Apollo

Apollo is a sales intelligence and engagement platform built around a database of more than 275 million contacts and tens of millions of companies. It lets sales and marketing teams search and filter that database to build prospect lists, then move straight into outreach with built-in email sequencing, a dialer, and LinkedIn engagement tools, all without leaving the platform. Enrichment and intent data help reps see things like recent job changes, funding rounds, or technology usage so outreach can be timed and targeted rather than generic.

It's aimed at SDRs, account executives, and revenue teams who currently piece together a data provider, an email tool, and a dialer separately. Apollo folds those functions into one subscription, which is a big part of why it undercuts competitors like ZoomInfo and Outreach on price while still covering similar ground. Its AI features include suggested lead lists, writing assistance for sequences, and a conversational assistant for building segments and workflows.

What sets Apollo apart is the combination of a large, frequently updated contact database with the actual execution tools (sequences, calls, chrome extension for LinkedIn/Sales Navigator) in a single product, at a price point accessible to smaller sales teams and startups rather than just enterprise budgets. It has grown into one of the more widely adopted go-to-market platforms among SMB and mid-market sales organizations.