Apollo.io
Prospect database plus email sequences, with AI that writes outreach and researches accounts before you contact them.
- Free plan or free tier
- Developer API
- Integrates with HubSpot
Cold email tool built for agencies, with unlimited mailboxes, inbox rotation and a shared inbox for replies.
Listing written by ClientsBook, checked 2026-11-03. Report a correction or request removal. Back to sales email and follow-up.