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Close is a sales-focused CRM with built-in calling, SMS, and email so reps can work leads from one place. It targets small and midsize sales teams that want to move quickly without extra tools. It was founded in 2013 and grew out of a sales consultancy.

Apollo.io combines a large B2B contact database with sales engagement and outreach tools. Teams use it to find prospects, enrich records, and run email sequences from one platform. It launched as ZenProspect in 2015 and later rebranded to Apollo.