Apollo.io

Free tier

The AI sales platform for smarter, faster revenue growth

Free tier available·All audiences·API available

Key strengths

230M+ verified B2B contacts and 30M+ companies in its databaseUnified platform replacing data provider, outreach, dialer, enrichment, and CRMAI-powered multichannel outreach with built-in email deliverability guardrailsAdvanced lead targeting with granular filtering and buyer intent signalsSeamless CRM integrations with Salesforce, HubSpot, and more

Free tier + paid plans

San Francisco, USA

Founded 2015

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CRM data enrichment pipelines: Use the /people/match and /organizations/search endpoints to programmatically enrich existing CRM records with verified emails, phone numbers, and firmographic data on a scheduled basis.
Automated sequence enrollment: Trigger outreach sequence enrollment via API when a lead reaches a specific stage in Salesforce or HubSpot, removing manual SDR intervention from top-of-funnel workflows.
Inbound lead routing automation: Integrate Apollo's real-time form enrichment and routing engine with your marketing automation stack to instantly qualify, score, and assign inbound leads to the right rep.
Webhook-driven data sync: Subscribe to Apollo email and call events via webhooks to feed engagement signals into a data warehouse (e.g., Snowflake, BigQuery) for revenue analytics and ML model training.
Chrome Extension customization: Embed Apollo's Chrome Extension into SDR workflows to surface verified contact data and one-click sequence enrollment directly on LinkedIn and company websites.
Custom reporting integrations: Pull campaign performance metrics (open rates, reply rates, meetings booked) via API to build unified GTM dashboards in BI tools like Tableau or Looker.