About
Plunk is an open-source email platform for transactional email, marketing campaigns, and workflow automation. It provides a REST API, SDKs for Node.js and Python, custom domains with DKIM, inbound email handling, analytics, and audience segmentation. The service can be self-hosted with Docker Compose or used as a hosted email sending platform.
The hosted plan includes 1,000 emails per month on the free plan, unlimited contacts, and Plunk branding on emails. Paid usage is billed at $0.001 per email with no base fee and no contact limits. The product is aimed at developers and SaaS teams that need one system for receipts, password resets, newsletters, and automated email sequences.
- 1,000 emails per month free
- Unlimited contacts on free plan
- Transactional and campaign email
- Workflow automation with branching logic
- Custom domains with DKIM
- Inbound email webhooks
- REST API and SDK access
- Self-hostable via Docker Compose
Free Tier Value
Plunk’s free tier is a capped recurring free plan: 1,000 emails/month with no credit card required, while the cheapest paid plan is usage-based at $0.001 per email. Using the rule for free_tier, the conservative monthly value is 1,000 × $0.001 = $1.00, but because the free plan includes branding and the paid plan removes it plus adds a spend cap, I conservatively discount the free-tier value to $0.33. The page explicitly states the free plan cap and the paid per-email rate, and it also confirms self-hosting is free, but that is a separate option rather than the hosted free tier.
What's included in the free tier
- 1,000 emails per month.
- Transactional emails for receipts, password resets, and event-driven email.
- Workflow automation with event-triggered sequences, delays, conditions, and branching logic.
- Campaign broadcasts for newsletters and announcements.
- Custom domains with automatic DKIM, SPF, and DMARC setup.
- Click and open tracking.
- Unlimited contacts.
- Plunk branding on emails.
See Plunk pricing for current limits.
Paid plans
Pay as you grow
- $0.001 each
- No Plunk branding
- Monthly spend cap
- Unlimited emails
- Includes everything in Free
Pricing extracted from Plunk's pricing page. Always verify current pricing before committing.
