Email and newsletters

Klaviyo alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

mautic/mautic10,301licence unclearFull-featured open-source marketing automation platform for campaigns, segmentation, email sends, and tracking engagement events.Open on GitHub knadh/listmonk22,655AGPL-3.0High-performance self-hosted newsletter and mailing list manager with templated emails, subscriber segments, and send queuing.Open on GitHub

What you give up either way

350+ native integrations and easy syncs to ecommerce/POs/analytics
High-volume delivery infrastructure and tuned deliverability
Agentic AI features (Composer, Customer Agent) and built-in AI credits
Advanced analytics, benchmarks, and predictive models
Enterprise SLAs, dedicated support, and partner marketplace

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Klaviyo, and it does not prove anyone has run it for a month. How we decide.