Open-Source
Email Platform
Open-source email automation. Build workflows, segment audiences, and send emails with a simple API.
Replace Resend, SendGrid, Mailchimp, and More
The open-source alternative to proprietary email platforms
Most email tools weren't built to scale
Complex setup
Hours of configuration needed
Contact limits
Growth penalties
Vendor lock-in
Closed source platforms
Built for scale
Everything you need to run email at any volume
Workflow Automation
Visual builder for complex email sequences with triggers, delays, and conditional logic.
Dynamic Segments
Real-time audience segmentation based on contact data and behavior.
Campaign Management
Broadcast emails with scheduling and performance tracking.
Analytics
Detailed metrics on opens, clicks, bounces, and conversions across campaigns.
Developer API
RESTful API with comprehensive documentation.
Custom Domains
Brand consistency with DKIM authentication and custom sending domains.
One contact, unified across everything
Every interaction flows into a single contact record with complete history
Transactional
Receipts, password resets
Campaigns
Newsletters, announcements
Workflows
Onboarding, drip sequences
Open source, privacy first
Transparent codebase, privacy-focused infrastructure, and the option to self-host
Open Source
AGPL-3.0 licensed
4K+ stars on GitHub
Privacy First
EU hosted
GDPR compliant
Self-Hostable
Deploy anywhere
Docker Compose ready
Simple, transparent pricing
Pay for what you use, nothing more
Calculated based on the plan that best matches the features of Plunk at 10.000 emails per month.
Trusted by the best
“Transparent and intuitive UI, extremely easy setup & automation and great support.”
“Lots of care put into Plunk”
“I've been using Plunk for building & sending out marketing emails and genuinely love it!”
“I loved the ease of use, beautiful UI and great UX. Everything simply works.”
“Simple to use, efficient and no regrets!”
“Clean design, easy to understand, fair pricing.”
Ready to get started?
Join thousands of businesses building better email experiences with Plunk