Apollo

• ▸B2B contact and company database (240M+ contacts, 30M+ companies) with search and advanced filtering
• ▸Data enrichment and cleansing for existing CRM records, including bulk enrichment
• ▸AI-powered multichannel outreach sequences (email, calls, tasks) with deliverability guardrails
• ▸Anonymous website visitor identification and real-time form enrichment
• ▸Pipeline and deal management with conversation intelligence and AI call summaries
• ▸Apollo API (REST, OpenAPI 3.1 spec) and an Apollo MCP server for AI-agent access
• ▸CRM integrations (Salesforce, HubSpot) and an official CLI / n8n node

Authentication

API key (header) for direct Apollo users; OAuth 2.0 for partner/mutual-customer integrations and for the MCP server

Rate limits

Enforced per-minute/hour/day simultaneously, varying by plan. Enrichment endpoints: Free 50/min, 200/hr, 600/day; Basic/Organization/Professional 1,000/min with no hourly/daily cap. Other endpoints: Basic/Organization 200/min, 400/hr, 2,000/day; Professional 200/min (or custom), 600/hr, 6,000/day (or custom).

Notable endpoints

• People search and enrichment
• Company/organization search and enrichment
• Bulk people enrichment
• Account, contact, and deal management
• Sequences and outreach (emails, calls, tasks)
• Analytics and reporting
• auth/health (API key test endpoint)

Machine-readable spec

OpenAPI spec retrieved

Published by the vendor themselves — not community forks.

• apollo-mcp-plugin18 stars

  Connect Claude Code + Cowork to Apollo MCP via this plugin

• apollo-io-cli50 stars
• n8n-nodes-apollo1 stars

We Used This 4-Step Apollo Sequence to Generate $10M+ Pipeline — Apollo

Checked 2026-07-30 against their pricing page. Vendors change pricing without notice.

Apollo is a sales intelligence and engagement platform, founded in 2015 by Tim Zheng and Ray Li, that positions itself as an all-in-one replacement for separate prospecting-data, email-sequencing, and sales-engagement tools. It claims 40,000+ paying customers and roughly 1 million sales professionals using the product, with a community/crowdsourcing approach to keeping its contact database current.

Sales development reps, account executives, sales leaders, revenue-operations teams, marketers, and founders who need to prospect, enrich contact data, and run outbound/inbound engagement from one system. Apollo's own FAQ explicitly claims to serve businesses "of all sizes," up to Fortune 500 customers such as Ernst & Young, Oracle, and Lyft, with a free Starter plan for the smallest teams and custom Enterprise plans above that.

Teams that need only a narrow slice of Apollo's surface (e.g. just enrichment, or just a CRM) may find it heavier than a single-purpose tool, since pricing and credits are bundled around the whole platform. The credit-metering model (contact unlocks, exports, and mobile numbers all consume separate credit pools with plan-specific monthly/annual caps) adds a layer of usage accounting that teams used to flat per-seat SaaS pricing may find harder to predict at scale. Free/trial accounts are also throttled to low API rate limits (as low as 50 requests/minute on enrichment, less on other endpoints), which is a poor fit for anyone wanting to build a production integration before committing to a paid plan.

Providers that resolve a person or company to verified contact data — email, phone, firmographics — through an API or a bulk upload.

Category: Contact and company enrichment. Membership is decided by 3 stated tests, not by category tags — see them and the full comparison.

CognismDropcontactExploriumAPIMCPFindymailFullEnrichHunterAPILeadMagicAPIProspeoSurfeAPI

• Full per-plan feature comparison table beyond the short marketing description per plan
• Exact list of individual MCP tool function names (docs present them as a human-readable action table, not machine tool identifiers)
• GitHub star count history / whether apolloio org repos are actively maintained beyond what's visible today