CRM APIs

Popular first highlights editorial picks, then ranks providers by monthly downloads of their official SDKs on npm and PyPI (measured 2026-10-18). Others follow A–Z.

radius

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Real Estate Webmasters

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Really Simple Systems CRM

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RealTime CRM

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Redhorse Systems

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Redtail CRM

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Redtail Technology

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Referral Rock

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Relenta

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Repbox

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Repsly

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Resco Mobile CRM

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Respond.io

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Results CRM & Business Suite

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Revamp CRM

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RevBoss

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Rex

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Ringy

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Robo CRM

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Rsoft CRM

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Saarif CRM

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Sage CRM

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SalesBabu

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Salesboom

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Salescamp CRM

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Salesflare

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Salesforce Essentials

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Salesforce Lightning

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SalesforceIQ

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SalesFundaa CRM

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Salesmachine

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Salesmanna

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Salesmate

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Salesnet

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SalesNexus

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SalesOutlook CRM

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SalesRabbit

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SalesTarget

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SalesUp!

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SalezShark

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Salpo CRM

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Samdock

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SanityOS

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SAP C4C

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SAP CRM

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SecondCRM

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Sellead

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Sellf

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Counts reflect unique named profiles assigned to this category. Documentation and integration details vary by provider.