Apollo.io

Apollo.io is a vertically integrated GTM platform built on a proprietary B2B contact and company database. It started as a self-serve alternative to ZoomInfo for SMBs and has expanded upmarket into an all-in-one platform covering prospecting, enrichment, outbound sequencing, dialing, CRM, and AI-assisted selling. Used by over 600,000 companies and millions of GTM professionals. Registered data broker; Apollo acts as both a data controller and data processor.

Database of 275M+ verified contacts and 73M companies searchable via 200+ filters (firmographics, technographics, intent signals, job postings, funding stage, revenue). Automated multichannel email sequences with A/B testing and task triggers. Built-in dialer including parallel dialing and international calling (Organization tier). Chrome extension for LinkedIn and website prospecting. CRM enrichment and deduplication. Buying intent signals and job-change alerts (higher tiers). AI-generated lead scoring, Plays (workflow automation), and a lightweight CRM for contacts, accounts, deals, and notes. Meeting scheduler and conversation intelligence. Customizable reporting and dashboards (Organization tier).

AI features include AI-assisted email writing (up to 1M words/month on Organization), AI-generated lead scoring models, natural-language sequence personalization, conversation intelligence on calls, and an AI Assistant for end-to-end agentic GTM workflows. REST API available; full advanced API access gated to the Organization plan ($119+/user/month). First-party MCP server officially launched: connects Apollo's database, enrichment engine, and sequencing directly to Claude, ChatGPT, Perplexity, Cursor, and any MCP-compatible client via OAuth 2.0 — no API key or developer setup required. MCP access mirrors Apollo account permissions and plan limits exactly; no additional MCP subscription cost. Multiple third-party MCP server implementations also exist on GitHub (covering people/org enrichment, search, CRM ops, and sequence management via 27–45 tools). An llms.txt index is available at docs.apollo.io/llms.txt for AI agent consumption.

Free plan (unlimited email credits subject to fair-use caps, 5 mobile credits, 2 active sequences, basic filters). Paid tiers billed annually: Basic ~$49/user/month, Professional ~$79/user/month, Organization ~$119/user/month (3-user minimum, ~$357/month entry). Monthly billing adds ~15–25%. Enterprise/custom plans negotiated directly; reportedly $3,000–$75,000+/year depending on seats and usage. Credits are the real cost driver: mobile/phone numbers cost 8x more than email credits; overage credits ~$0.20 each with 250-credit minimum purchase; credits expire monthly. Advanced API access, SSO, international dialer, intent data, and custom reports all require the Organization tier. Real-world all-in costs for active outbound teams reportedly run $150–$400/user/month once overages and add-ons are factored in. Salesforce integration requires Professional tier or above; HubSpot accessible from Basic.

Native bi-directional CRM integrations with Salesforce, HubSpot, Pipedrive, Zoho CRM, and Microsoft Dynamics 365. Native integrations with Outreach, Salesloft, Gong, Marketo, SendGrid, LinkedIn, Gmail, Outlook, Slack, and Google Calendar. Chrome extension overlays Apollo data on LinkedIn, Sales Navigator, Salesforce, HubSpot, Gmail, and any company website. Zapier and Make connections extend to 7,000+ additional apps. REST API for custom data pipelines (Organization tier). Clay integration for joint enrichment workflows. First-party MCP server for Claude, ChatGPT, Perplexity, Cursor, Codex. 50+ integrations in the marketplace.

SOC 2 Type II certified (audited by A-LIGN). ISO/IEC 27001 certified (A-LIGN). GDPR compliant as both Data Controller and Data Processor; EU-US Data Privacy Framework participant; SCCs available. CCPA and CPRA compliant. CASA Tier 2 certified. Encryption at rest and in transit. Multi-layer database security: encrypted passwords, 2FA, intrusion detection, VPC with strict firewall. DPA available. Recovery Time Objective: 6 hours; Recovery Point Objective: 24 hours. SSO and permission profiles on Organization tier only. Notable caveat: Apollo's LinkedIn page was delisted in early 2025 reportedly over data policy violations — does not affect platform availability but is a compliance signal worth noting for regulated buyers. Apollo cannot warrant individual consent for every contact in its database (standard across the industry for contributory B2B databases).

Founded 2015 in Covina, CA (also listed as San Francisco) by Tim Zheng (CEO) and Ray Li; originally named ZenProspect/ZenLeads. Total funding $251.3M across 6 rounds: Series D ($100M, August 2023) led by Bain Capital Ventures, with Sequoia Capital, Tribe Capital, and Nexus Venture Partners. Valuation $1.6B at Series D. Series C ($110M, March 2022) led by Sequoia. Sacra estimates ~$150M ARR as of May 2025, up from $134M at year-end 2024 (40% YoY). ~1,600 employees as of 2026. Notable customers include Qualtrics, Customer.io, and Census. Acquired Pocus (product-led growth platform) in March 2026. Ranked on 2025 Deloitte Technology Fast 500.

Moderate. Apollo is purpose-built for sales and GTM teams, not investment firms — its database and outreach tooling are optimized for B2B commercial prospecting, not deal sourcing or relationship intelligence in a VC/GE context. That said, a firm can extract real value from it for two specific workflows: (1) building targeted outreach lists for company sourcing using firmographic + funding-stage + technographic filters (e.g., find CTOs at Series B defense-tech companies), and (2) enriching contact records pushed into a CRM like Attio with verified emails, direct dials, and company data. The first-party MCP server is a meaningful differentiator — analysts can run natural-language prospecting and enrichment queries directly from Claude or Cursor without switching tools. The sensitivity is Medium: firm queries and prospect lists flow through the platform, but core deal data and LP information do not. The credit-based pricing model and data accuracy limitations (~65–70% real-world email accuracy) reduce its reliability as a standalone enrichment layer for a lean team.

Not designed for VC/GE relationship intelligence — no deal pipeline modeling, fund entities, or LP relationship mapping out of the box. Data accuracy reported at 65–70% real-world email accuracy with 15–25% bounce rates; supplementary verification tools often needed. Credit system complexity: phone credits cost 8x email credits, overages add up quickly, credits expire monthly. Advanced API access and SSO locked to Organization tier ($119+/user/month, 3-user minimum). LinkedIn page delisted in early 2025 over reported data policy violations — compliance signal for regulated buyers. Auto-renewal and cancellation friction flagged in user reviews (60-day written notice required). Seat reductions not permitted mid-contract. Apollo ingests CRM data into its contributory database — creates data privacy considerations for firms sensitive about contact data leaving internal systems.