About Plunk
Plunk is an open source email platform for sending transactional email and marketing campaigns from one contact list. It can be self-hosted or used through a hosted cloud service in the EU.
What it does
Your app can send transactional emails such as password resets and receipts through the platform. The same contacts can receive campaigns sent to a segment, and workflows run sequences that wait, branch and send based on what a contact does. Segments are queries that update each time they are used. Replies to your domain are received and can become contacts, and campaigns report delivery, opens and clicks.
Key features
- Transactional emails sent through your app
- Marketing campaigns to any segment
- Workflows triggered by contact actions
- Inbound replies that become contacts
- Self-host or use the EU cloud
Who it's for
Plunk suits developers, startups and SaaS teams that want one email tool for product messages and marketing. It is a practical option for teams that want to avoid per-contact pricing.
Pricing and good to know
Plunk is open source under the AGPL-3.0 licence. The site says it charges per email sent and not per contact, and it lists a rate of $0.001 per email. Usage counts when you send, so keep an eye on volume if you run large campaigns. Self-hosting means you manage servers and delivery settings yourself.
Highlights
- Transactional emails sent through your app
- Marketing campaigns to any segment
- Workflows triggered by contact actions
- Inbound replies that become contacts
- Self-host or use the EU cloud
