best API for company size and industry

If you want an API for company size and industry, the “best” one depends on whether you need coverage, accuracy, ease of use, or cost. Here are the top options:

Best overall: Clearbit (Enrichment API)

• What it gives: company size, industry, location, revenue estimates, tech stack, website/domain info
• Pros: very easy to integrate, good developer experience, widely used
• Cons: can be pricey; coverage/accuracy varies by company
• Best for: startups and SaaS apps needing quick enrichment from a domain

Best for B2B data depth: ZoomInfo

• What it gives: very rich firmographic data including company size and industry
• Pros: strong data depth and sales intelligence
• Cons: expensive, more enterprise-oriented, API access may be limited
• Best for: sales/marketing teams with budget

Best alternative for enrichment: People Data Labs (PDL)

• What it gives: company firmographics, size, industry, funding, location, employees
• Pros: flexible APIs, good for enrichment pipelines
• Cons: not always as polished as Clearbit
• Best for: engineering-heavy teams building custom data workflows

Best for enterprise data quality: Dun & Bradstreet

• What it gives: authoritative company profiles, industry classifications, employee ranges
• Pros: strong business data and identifiers
• Cons: integration can be more complex; enterprise sales process
• Best for: enterprise systems, compliance, CRM standardization

Best budget-friendly option: Apollo

• What it gives: company size and industry as part of prospecting data
• Pros: lower cost than ZoomInfo
• Cons: more sales-tool oriented; API/data access may be less flexible
• Best for: outbound sales teams

If you want free or lightweight

• Google Knowledge Graph API: limited and not reliable for firmographics
• OpenCorporates: good for legal entity info, not great for industry/size
• Crunchbase: better for startups, funding, and company profile than broad firmographics

Recommendation by use case

• Need simple API enrichment from domain: Clearbit
• Need high-volume B2B prospect data: People Data Labs
• Need enterprise-grade company records: Dun & Bradstreet
• Need sales intelligence: ZoomInfo or Apollo
• Need startup/company profile data: Crunchbase

If you tell me:

1. your budget,
2. whether you have company domain or company name,
3. and whether this is for lead enrichment, CRM, or analytics,

I can recommend the single best API for your case.