Apollo.io

Apollo.io is one of the most widely used B2B data platforms, and for many founders and small sales teams it is the first tool they reach for when starting outbound. It combines a large contact and company database with prospecting filters, enrichment and a built-in engagement layer for email sequences and calls.

You can search for prospects by title, industry, company size, technology and many other filters, reveal verified emails and mobile numbers, and push contacts straight into sequences or your CRM. Enrichment keeps existing records up to date, and a Chrome extension lets you pull contact details while browsing LinkedIn or company websites. Because data and outreach live in one place, Apollo can replace several separate tools for a lean team.

Apollo uses credits: email credits to reveal emails, mobile credits to reveal phone numbers and export credits to export records. Heavy users should watch credit limits, as overages and add-ons can raise the real cost.

There is a permanent free plan with limited credits and basic sequencing. Paid plans start with Basic at $49 per user a month billed annually, followed by Professional at $79 and Organization at $119.