Open Source Cold Email That Actually Works
Stop paying enterprise prices for cold email. Coldflow makes cold outbound functional, transparent, and accessible for everyone.
Everything You Need for Cold Outbound
Built for transparency and control. No black boxes, no vendor lock-in.
Infrastructure & Domain Setup
Automated infrastructure provisioning and domain warming. Get your sending domains configured correctly from day one with proper SPF, DKIM, and DMARC records.
Smart List Creation
Build targeted prospect lists with advanced filtering and segmentation. Import from multiple sources or use built-in discovery tools to find your ideal customers.
Data Enrichment
Enrich your contacts with verified email addresses, phone numbers, company data, and social profiles. Integrate with leading data providers or use your own sources.
AI-Powered Research
Automated prospect research that finds relevant talking points, company news, and personalization opportunities at scale. Know your prospects before you reach out.
Intelligent Personalization
AI-driven personalization that writes unique, contextual emails for each prospect. Go beyond simple merge tags with genuine personalization that converts.
Advanced Sequencing
Create sophisticated multi-touch campaigns with conditional logic, A/B testing, and automatic follow-ups. Control every aspect of your outreach strategy.
Why Coldflow?
Functional. Every feature you need to run successful cold email campaigns, from infrastructure to inbox.
Transparent. Full visibility into your data, deliverability, and performance. No black boxes or hidden algorithms.
Accessible. Open source and self-hostable. Own your infrastructure, control your costs, customize everything.
Built for Developers
Coldflow is built with modern technologies and designed to be extended. Use our REST API, webhooks, and plugin system to integrate with your existing tools or build custom workflows.
- •RESTful API with comprehensive documentation
- •Webhook events for real-time integrations
- •Plugin architecture for custom functionality
- •Docker deployment for easy self-hosting
Open Source & Community Driven
We believe cold email software shouldn't be a black box. Coldflow is completely open source, giving you full control over your outreach infrastructure and the freedom to customize everything.
- •100% open source code on GitHub
- •Active community and regular updates
- •Self-host or use our managed service
- •Contribute and shape the roadmap
Ready to Level Up Your Cold Outbound?
Join developers and sales teams who are taking control of their cold email infrastructure. Get started in minutes with our Docker deployment or sign up for our managed service.