Plunk
Campaigns, transactional mail and workflows in one container; the sending provider still sends a bill.
Technical Profile & Specs
verified 2026-08-10
- Cost
- $0 / forever (Open Source)
- License
- AGPL-3.0
- Hosting Model
- Local or hosted (your machine or their cloud)
- Platforms
- webself-hosteddocker to self-host
- Installation
- Hosted signup, or the official Docker Compose stack
- Operational Setup
- Hosted use still needs domain authentication; self-hosting adds PostgreSQL, Redis, MinIO, Nginx or another proxy, exposed web and SMTP services, DNS, and ongoing deliverability work.
- Where Your Data Lives
- The self-hosted stack stores core data in PostgreSQL, jobs and cache in Redis, and objects in MinIO; hosted data is kept in Plunk's EU infrastructure.
- The Catch / Trade-off
- Plunk is developer-first and much thinner in visual audience management, CRM depth, segmentation tooling, and marketer-oriented reporting.
Replaces 7 paid apps
up to $132/mo ($1,584/yr) in subscriptions
Plunk FAQ
Common questions
Is Plunk free and open source?+
Plunk is an open-source tool licensed under AGPL-3.0 that runs on local or hosted. Campaigns, transactional mail and workflows in one container; the sending provider still sends a bill.
What paid software does Plunk replace?+
Plunk serves as a free replacement for 7 paid SaaS applications: ActiveCampaign, Bento, Brevo, Drip, Loops, Mailchimp, Mailcoach Cloud, saving up to $132/month ($1,584/year) in subscription bills.
How do you install and set up Plunk?+
Installation: Hosted signup, or the official Docker Compose stack. Setup notes: Hosted use still needs domain authentication; self-hosting adds PostgreSQL, Redis, MinIO, Nginx or another proxy, exposed web and SMTP services, DNS, and ongoing deliverability work.
What is the catch or trade-off with Plunk?+
Plunk is developer-first and much thinner in visual audience management, CRM depth, segmentation tooling, and marketer-oriented reporting.