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Apollo.io Data API

Offers sales intelligence and contact data API for lead generation.

Our take: Apollo.io is a sales intelligence and engagement platform with a REST API giving access to 210M+ B2B contacts and 35M+ companies.

Best forMarketing professionals
ReviewedPricing: Freemium
7.5 out of 105 criteria · see breakdown
Try Apollo.ioFree tier; paid from $49/mo (annual)
The bottom line

The go-to B2B data API for sales teams that need scalable contact enrichment and prospecting at reasonable entry costs.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

Community ratings

Shown for context only. Our score is independent.

G2
4.8 out of 5
5,300+ reviews
Trustpilot
4.4 out of 5
140+ reviews

4.8 / 5 aggregate · across 2 sources

Third-party ratings shown verbatim; aggregate weighted by review volume.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isApollo.io Data API — B2B sales intelligence and contact data API for prospecting and enrichment.
Our takeApollo.io is a sales intelligence and engagement platform with a REST API giving access to 210M+ B2B contacts and 35M+ companies.
Apollo is squarely a B2B sales prospecting platform with a legitimate free tier; paid API-enabled plans start at $49/mo (annual). It is built for sales and marketing teams.
Why we rate itApollo combines one of the largest B2B contact databases with built-in sequencing, dialer, and CRM sync — making it a rare all-in-one for outbound teams.
The API is well-documented with OAuth 2.0, people search, enrichment, and account endpoints.
The catchCredit limits bite fast on the lower tiers; real-world costs often run 2–3× the base price once extra credits are purchased.
Full API rate limits and bulk enrichment require Organization or custom plans.

Best / not good for

Best for
  • B2B sales and RevOps teams building automated lead generation pipelines
  • Developers enriching CRM records with verified contact and firmographic data
  • Account-based marketing teams needing intent signals and technographic filters
Not good for
  • Consumer or B2C use cases — database is strictly B2B
  • Teams needing massive bulk exports on a budget (credit costs escalate quickly)
  • Social-media scraping or Facebook/Instagram engagement data (entirely different product category)
Trade-offs

Friction report

Trade-offs to know before signing up.

  1. Time to value
    Fast: free account and API key in minutes; first people-search or enrichment call achievable same session.
  2. Scale breakpoint
    Credit exhaustion kicks in quickly at scale; Organization plan minimum of 3 seats and custom API agreements required for high-volume enrichment.
  3. Walled garden
    Moderate: data and sequences live in Apollo; CRM sync (Salesforce, HubSpot) and export APIs exist but workflow lock-in is real at higher usage.
Still a fit?
If none of these block you, start on the free plan.
Try Apollo.io

A look inside

Apollo.io Data API product screenshot

Frequently Asked Questions

Can businesses enrich leads with accurate company and contact data?

Businesses can enhance lead records with accurate company insights and direct contact information.

Can Apollo.io Data API enrich leads with company and contact data?

Apollo.io Data API enriches leads with company and contact data including verified emails, phone numbers, and firmographic insights.

How can Apollo.io's Data API help sales teams access over 275 million contacts with detailed firmographic and technographic data for targeted prospecting?

Apollo.io’s Data API grants sales teams access to an extensive database of contacts with firmographic and technographic insights for precise prospecting.

How does this sales data API deliver contact information, company details, and prospecting insights?

The sales data API provides verified contact details, company profiles, and prospecting intelligence for outreach.

What B2B contact and company data access features does this API provide for sales teams?

The API offers B2B contact and company data access with verified emails, phone numbers, and firmographic attributes for targeted outreach.

Alternatives

  • Step up

    ZoomInfo for enterprise-grade data compliance, wider intent signal coverage, and dedicated support SLAs.

  • Lighter alternative

    Hunter.io or Clearbit Enrichment API for simpler, lower-volume contact lookup without the full engagement platform.

Showing 1–2 of 2

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Tags

#SalesIntelligence#Data

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