Open Source Klaviyo Alternatives

Mautic is the largest open source marketing automation project, and it exists so an organization can run integrated campaigns without renting a platform to do it. Contacts, segments and campaign history live in a database you administer, on a server you control.

The project frames its aim as being the most privacy-focused, accessible and extendable marketing automation product on the market. It was verified as a Digital Public Good in 2024, and both the frontend and the backend are meant to be customized rather than merely configured.

What that self-hosted position actually buys is worth being specific about.

• No third-party dependency: campaigns run on infrastructure you own instead of a vendor SaaS.
• Data ownership: contact records and campaign history sit in your own database.
• No vendor lock-in: the software can be modified, extended or left behind at will.
• Unlimited segmentation: segments and automation are not capped by a pricing tier.
• Multi-channel reach: additional channels arrive without additional cost.
• Custom integrations: anything the project does not ship can be built against it.

Installing with Composer is the recommended route, and a prepackaged production download exists for anyone who would rather stay away from the command line. A DDEV configuration ships in the repository, so a single start command runs the first-run process and configures the application automatically.

One caution from the maintainers deserves repeating. Source outside a tagged release should be treated as alpha and kept out of production, where a schema drifting from the release line can break the updater and require manual repair.

Notifuse sends newsletters and transactional email from infrastructure you control, positioning itself against Mailchimp, Brevo, Klaviyo and their peers. What it removes is the per email bill and the copy of your contact list living in someone else's database.

The backend is Go, arranged in domain, service, repository and HTTP layers, with PostgreSQL as the only datastore. The admin console is React, TypeScript and Ant Design, and an embeddable notification center widget ships beside it. Delivery goes out through a provider you connect, with Amazon SES, Mailgun, Postmark, Mailjet, SparkPost, SendGrid and plain SMTP supported.

The platform reaches well past broadcast sending.

• Visual builder: drag and drop editing on MJML components with real-time preview.
• Automations: multi-step journeys built as a graph of delay, branch, filter, webhook and A/B test nodes.
• Liquid templating: drop contact fields into subject lines and bodies.
• Web analytics: cookieless traffic measurement with engaged time sessions and channel attribution, all on PostgreSQL.
• Transactional API: trigger mail from your own code over REST and receive events by webhook.
• Workspaces: keep separate tenants for teams or agency clients.

Deployment is a Docker image with an interactive setup wizard, and the web analytics side needs PostgreSQL 17 or newer. The project does not accept pull requests, though issues are welcome, and version 40.0 onward carries a Business Source License 1.1 that converts to AGPL-3.0 four years after each release, while version 39 and everything earlier stays AGPL permanently. Five capabilities require a license key and the send path contains no license check.