100% free cold outreach platform with unlimited mailboxes and autonomous warmup
The outreach platform for your AI agent
Stage
Not given
Not given
Founded
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Based in
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US
Pricing model
Free
Free trial
Pricing
Free forever with unlimited inboxes, sequences, warmup, and unified inbox. Optional paid add-ons planned for premium B2B lead data and dedicated private IP pools.
Hosted Sellbird is in early access with pricing to be shared before launch. Email accounts and AI plans are billed separately by their providers. Domain purchases and additional inboxes incur separate charges.
Key features
Unlimited connected mailboxes across Google Workspace, Microsoft 365, and private SMTP
Autonomous peer-to-peer email warmup included at zero cost
Multi-step automated cold email sequences
Unified master inbox (Unibox) for all connected mailboxes
Dynamic spintax personalization for email templates
Automated mailbox rotation across connected accounts
Spam folder rescue for warmup emails
Enterprise analytics engine and reporting
Support for unlimited contact uploads
Find companies matching your customer profile with buying signals
AI agent integration over MCP protocol
Personalized email drafting from research
Draft approval workflow by default
Email warmup and sending infrastructure
Reply collection and sorting
Agent-drafted reply responses
Support for Google Workspace and Microsoft 365
CSV export of contacts and lists
What makes it different
Unlimited mailbox connections without per-mailbox tiers or paywalls
AI-powered thread replies integrated into warmup process
Bring your own domains and leads model reduces dependency
14-day gradual warmup ramp with automated sender reputation building
Works with the AI agent you already use—no competing AI, no additional AI costs
Human approval on by default—every email, purchase and reach requires human approval
Open-source and self-hostable version is free
Email verification works independently without running full outreach
Agents work offline after scheduling—emails send and replies collect 24/7
Xpoudy
Sellbird