What is Plunk?
Transactional email, newsletters and event-triggered workflows on one contact list, with an API.
Who is Plunk best for?
Plunk is best for SaaS founders and developers who send product, onboarding and marketing email from their app.
Onboarding sequences
Workflows start from events your app sends, then wait, branch on whether an email was opened and send the next step.
One list for every email
Receipts, campaigns, replies and workflow steps sit on one contact record you can segment and trigger from.
Big lists, small sends
Contacts are free to store, so the bill follows the emails you send, not the size of your list.
Existing apps on SMTP
The SMTP relay lets an app or framework send through Plunk without code changes.
How much does Plunk cost?
Plunk is free to self-host, and its EU cloud is free for 1,000 emails a month, then $0.001 per email, with unlimited contacts on both plans.
- The same code as Plunk Cloud
- Mail goes out through your Amazon SES account
- No per-email fee from Plunk
- 1,000 emails a month
- Unlimited contacts and every feature
- Plunk branding on emails
- No Plunk branding
- Monthly spend cap
- Unlimited emails and contacts
Every plan has every feature, including workflows, inbound email, SMTP relay and email validation. Sending 10,000 emails in a month costs $10 on the paid plan. The cloud is hosted in the EU. Full pricing on useplunk.com. We checked these prices on .
How do readers rate Plunk?
No one has rated Plunk yet. Be the first.
Sign in to rate. One rating per account.
Is Plunk open source?
Yes. Plunk's code is public under the AGPL 3.0 licence, so you can run it on your own server.
On GitHub
5,605stars
+85 (+1.5%) in the last 30 days
- Last commit
- 13 Nov
- Repository age
- 2 years
- Latest release
- 1 Nov
- Licence
- AGPL 3.0
- Self-hosted
- Yes
- Repository
- useplunk/plunk
What are the best Plunk alternatives?
Plunk is an open source alternative to ActiveCampaign, Loops, Nitrosend and Sequenzy. Mautic and MailCheap do the same job and are open source too.
ActiveCampaignFreemiumMarketing automation with AI-driven campaigns.
LoopsFreeSend newsletters, product emails and app receipts from one contact list, made for SaaS companies.
NitrosendFreeEmail platform run from Claude, ChatGPT, Codex or any MCP agent, for agencies and SaaS teams.
SequenzyFreeSends SaaS onboarding flows, newsletters and receipts from one account, triggered by Stripe events.
MauticOpen SourceMarketing automation suite with campaign journeys, email, landing pages, forms and lead scoring.
MailCheapOpen SourceNewsletter app with a web archive, signup forms and an MCP server, billed by emails sent.
Questions about Plunk
What is Plunk?
Transactional email, newsletters and event-triggered workflows on one contact list, with an API.
Who is Plunk for?
Plunk is best for SaaS founders and developers who send product, onboarding and marketing email from their app.
Is Plunk free?
Yes. Plunk has a free Self-hosted plan: the same code as Plunk Cloud.
How much does Plunk cost?
Plunk's paid plans are Pay as you grow at $0.001 per email.
Is Plunk open source?
Yes. Plunk's code is public under the AGPL 3.0 licence, so you can run it on your own server.
What are the best Plunk alternatives?
The closest alternatives on Recaply are ActiveCampaign, Loops, Nitrosend, Sequenzy, Mautic and MailCheap.
Where can I try Plunk?
On its official website, useplunk.com.
Do I need Amazon SES to self-host Plunk?
Yes. Plunk's self-hosting guide sends all mail through your own Amazon SES account, alongside Docker Compose and a domain with subdomains for the dashboard, API and optional SMTP relay.
useSend
Kit
Brevo
MailerLite
listmonk
Keila