# Plunk — The Open-Source Email Platform

Transactional emails, marketing campaigns, and workflow automation — in one platform.
Self-hostable, $0.001 per email, no contact limits.

[Get started free](https://next-app.useplunk.com/auth/signup) | [Read the docs](https://docs.useplunk.com)

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## Key facts

| Metric | Value |
|--------|-------|
| Price | $0.001 / email |
| GitHub stars | 5,000+ |
| Contacts | Unlimited, always free |
| Setup time | < 5 minutes |
| License | AGPL-3.0 |

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## Replace your email stack

One tool in place of Resend, SendGrid, Mailchimp, Customer.io, and Mailgun.

- [Plunk vs Resend](/vs/resend)
- [Plunk vs SendGrid](/vs/sendgrid)
- [Plunk vs Mailchimp](/vs/mailchimp)
- [Plunk vs Customer.io](/vs/customerio)
- [Plunk vs Mailgun](/vs/mailgun)

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## Why Plunk

### Setup — < 5 min
Most email platforms take days to configure. Plunk is running in under five minutes — domain, DKIM, and first send included.

### Pricing — 0 limits
Other platforms charge more as your list grows. Plunk stores unlimited contacts for free and bills only on send.

### Ownership — AGPL-3.0
Closed-source platforms own your stack. Plunk is fully inspectable, forkable, and self-hostable on your own infra.

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## Features

### Workflow Automation
Visual builder for complex email sequences with triggers, delays, and conditional logic. No code required.

### 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.

### Inbound Email
Receive and process incoming emails with webhook notifications.

### Custom Domains
Brand consistency with DKIM authentication and custom sending domains.

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## Data model

Every interaction flows into a single contact record — transactional, campaign, and workflow events unified in one source of truth.

- **Transactional** — Receipts, password resets, event-driven sends
- **Campaigns** — Newsletters, product launches, announcements
- **Workflows** — Onboarding sequences, drip campaigns

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## Open source

- **License**: AGPL-3.0
- **Hosting**: EU-hosted, GDPR compliant
- **Deployment**: Self-hostable via Docker Compose
- **Community**: 5,000+ GitHub stars

[View on GitHub](https://github.com/useplunk/plunk)

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## Pricing comparison

**Plunk: $0.001 / email**

| Provider | Price / email |
|----------|--------------|
| Plunk | $0.001 |
| Mailgun | $0.003 |
| SendGrid | $0.002 |
| Mailchimp | $0.004 |

*Based on plans matching Plunk at 10,000 emails per month.*

[Full pricing details](/pricing)

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## Testimonials

> "Transparent and intuitive UI, extremely easy setup & automation and great support."
> — Artur Czemiel, Founder at GraphQL Editor

> "I've been using Plunk for building & sending out marketing emails and genuinely love it!"
> — Joe Ashwell, Founder at UnwindHR

> "I loved the ease of use, beautiful UI and great UX. Everything simply works."
> — Alisson Leal, Founder at Brapi

> "Clean design, easy to understand, fair pricing."
> — Pierre Jacquel, Founder at Landingly

> "Simple to use, efficient and no regrets!"
> — Noah Di Gesu, Founder at Smoothey

> "Lots of care put into Plunk"
> — Jonni Lundy, Founding Operations Manager at Resend

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## FAQ

**How is Plunk different from other email automation tools?**
Plunk is built for SaaS businesses, indie hackers, and developers. Create complex automated email flows and trigger them from anywhere through a single API call.

**Can I use Plunk for transactional emails?**
Yes. Plunk handles transactional emails — sign-ups, cancellations, plan changes — alongside marketing emails in the same platform.

**Can I use Plunk for newsletters?**
Yes. Plunk lets you send newsletters and broadcast emails to your full list or any segment.

**What programming languages does Plunk support?**
Any language capable of HTTP requests. Plunk provides a REST API plus SDKs for Node.js, Python, and more.

**How much does Plunk cost?**
Free plan includes 1,000 emails/month. Paid plan is $0.001 per email with no contact limits.

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Start sending in 5 minutes. Free plan available. No contact limits, no surprises.

[Create free account](https://next-app.useplunk.com/auth/signup) | [Read the docs](https://docs.useplunk.com)