Pick Apollo if you need to find and engage net-new prospects. Apollo's 275M+ contact and 73M+ company database, built-in sequences, and dialer let an SMB or mid-market team run a full outbound motion on one transparent per-seat bill, starting free.
Pick Clearbit if you live inside HubSpot and your main need is enriching inbound leads, form fills, and existing CRM records with firmographic data. As Breeze Intelligence, it installs natively and requires almost no setup if HubSpot is already your system of record.
Pick a waterfall enrichment layer like Enrich if your real problem is coverage and cost. Instead of relying on Apollo's single database or Clearbit's single enrichment source, waterfall enrichment queries several providers in sequence and keeps the first verified hit, which lifts match rates above any one tool while keeping you on transparent per-credit pricing.

