Apollo.io

Apollo.io is an all-in-one B2B sales intelligence and engagement platform combining a 275M+ contact database with autonomous outreach automation, email sequencing, a built-in dialer, and CRM sync. Founded in 2015, $251M raised, valued at $1.6B. Used by 500,000+ companies from startups to global enterprise. The core agentic capability is autonomous sequence execution: once a prospect is enrolled, Apollo sends emails, waits for replies, follows up, and logs all activity to your CRM without human approval at each step. AI-powered Plays are multi-step automated workflows triggered by prospect signals like job changes, funding rounds, or website visits that enrich contacts and enrol them in sequences automatically. This is genuine outbound automation, not just a prospecting database. Integration depth is action-level, not read-only. Apollo writes to Salesforce and HubSpot, creating contacts, updating fields, logging email and call activity, and syncing sequence enrollment status, rather than just reading from them. API access is available on Professional ($79/user/mo) and above, enabling programmatic enrichment and custom workflow automation. Pricing uses a hybrid model: per-seat subscription plus credit-based usage. Free tier includes 100 email credits/month. Basic: $49/user/month (annual) with 1,000 credits/month. Professional: $79/user/month with 4,000 credits/month, the minimum tier for API access, dialer, and full sequencing. Organization: $119/user/month, minimum 3 seats ($4,284/year minimum commitment) with advanced security and SSO. Monthly billing adds approximately 20%. Credits expire at month-end with no rollover. Total cost of ownership regularly runs 2-3x the advertised per-seat rate. Additional credits cost $0.20 each after plan limits are exhausted. Teams averaging 500+ enriched contacts per month per rep will consistently exceed Basic plan limits. Seat reductions are not permitted mid-contract. If headcount drops, you continue paying for unused seats until renewal. API access at Professional tier combined with credit consumption for programmatic enrichment is the most common source of budget overrun. G2 rating: 4.7/5 from 9,015+ reviews. SOC 2 Type II, ISO/IEC 27001, GDPR, CCPA, CASA Tier 2 certified.