100% free cold outreach platform with unlimited mailboxes and autonomous warmup
Open-source cold email and warmup platform
Stage
Not given
Startup
Founded
Not given
2024
Based in
Not given
GB
Pricing model
Free
Freemium
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.
Not given
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
Mailbox warmup with automatic reputation building
Campaign sequences with A/B testing
Unified inbox with reply classification
Deliverability tracking and inbox placement tests
Automation workflows with conditional logic
Per-mailbox safety caps and throttling
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
Fully open-source codebase under Apache 2.0, readable on GitHub
Self-hostable with one command or cloud-hosted options
Unlimited mailboxes on paid plans, no per-mailbox fees
Transparent health rules with full explanations for throttling
Built in public with public changelog and no inflated metrics
Xpoudy
Warmbly