Plunk
Open-source email platform for transactional and marketing emails with automation.
Overview
Plunk is a open-source email platform for transactional and marketing emails with automation. It handles open source, automations, transactional, and analytics, and it's best suited for developers wanting open-source transactional email. Launched in 2022, it's a relatively recent entrant that's been gaining traction.
The core product is entirely free. Since it's open-source, you can self-host for free with no user limits. It's designed for small teams, striking a balance between simplicity and collaboration features.
Strengths
- Open source and transparent
- Open-source codebase gives you full transparency and community-driven development
- Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
- The core product is free with no paywalled essentials
Weaknesses
- May lack some advanced features
- Self-hosting is free but requires server maintenance and DevOps knowledge
- Fewer built-in features means you may need additional tools to cover gaps
- Deliverability depends on your sender reputation, which takes time to build
Quick info
- Category
- Email Marketing
- Starting price
- Free
- Free tier
- Fully free
- Open source
- Yes
- Best for
- Small teams
- Founded
- 2022
Last updated 2026-04-12
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