Plunk
Open-Source Email Platform for Transactional Emails and Marketing Automation
GitHub
Repository →
5,006
Stars
AGPL-3.0 v0.9.0 Apr 24, 2026
Since Jul 2024 20
open issues
AI Summary
Plunk is an open-source email platform that combines transactional emails, marketing campaigns, and workflow automation. The platform is self-hostable, costs only $0.001 per email, and offers unlimited contacts with no hidden fees. With over 5,000 GitHub stars, Plunk is specifically designed for SaaS companies, indie hackers, and developers.
✓ Pros
- + Extremely affordable pricing of only $0.001 per email with no contact limits
- + Open-source and self-hostable for full control and transparency
- + Intuitive user interface with easy setup and automation
✗ Cons
- − Relatively new platform with potentially fewer features than established providers
- − Self-hosting requires technical expertise and infrastructure
Use Cases
- → Sending transactional emails such as registration confirmations, cancellations, and plan changes
- → Triggering automated marketing email flows via API call
- → Sending newsletters and broadcast emails to contact lists or segments
- → Self-hosting your own email infrastructure for complete data control
Who is it for?
Ideal for SaaS companies, indie hackers, and developers looking for a cost-effective, transparent email solution with API integration.
