The open-source
email platform
Transactional emails, marketing campaigns, and workflow automation — in one platform. Self-hostable, $0.001 per email, no contact limits.
Replace your email stack
One tool in place of Resend, SendGrid, Mailchimp, Customer.io, and Mailgun.
Most email tools weren't built to scale.
Three things Plunk gets right, out of the box.
Zero-configuration start
Most email platforms take days to configure. Plunk is running in under five minutes — domain, DKIM and first send.
Pay per email, never per contact
Other platforms charge more as your list grows. Plunk stores unlimited contacts for free and bills only on send.
No lock-in, ever
Closed-source platforms own your stack. Plunk is fully inspectable, forkable, and self-hostable on your own infra.
Everything you need. Nothing you don’t.
Every Plunk install ships with the full platform — no upsell pages, no locked modules.
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.
One contact, complete history.
Every interaction flows into a single contact record. Transactional, campaign and workflow events — one source of truth.
Transactional
Receipts, resets
Campaigns
Newsletters, launches
Workflows
Onboarding, drip sequences
Privacy first. Code visible.
AGPL-3.0 licensed, EU-hosted, GDPR compliant. Inspect the code, self-host, or use our cloud.
Open Source
5,000+ stars on GitHub
Privacy First
GDPR compliant
Self-Hostable
Docker Compose ready
Simple. Transparent.
Pay for what you send, nothing more. No tiers. No surprises at scale.
For the same plan, others charge
Based on plans matching Plunk at 10,000 emails per month.
Quiet praise, from operators.
No hyperbole. Just the people building products on Plunk.
“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.”
Start sending in 5 minutes.
Free plan available. $0.001 per email on paid. No contact limits, no surprises.