Important: you manage sending
These tools need an SMTP provider or Amazon SES to send emails, and deliverability, warm-up, and compliance are your responsibility. None includes Klaviyo's native SMS or predictive segments.
Alternatives / Klaviyo
6 open-source alternatives
6 Best Open Source Klaviyo Alternatives in 2026
Looking for an open source Klaviyo alternative? We compared 6 open source email marketing and automation tools by license, automation, sending infrastructure, and self-hosting. None matches Klaviyo's ecommerce integrations and predictive analytics, but Mautic and Listmonk cover most campaign needs.
Written by Maxime DERAME
Last updated:
Best Klaviyo alternatives at a glance
| Alternative | Best for | License |
|---|---|---|
| Listmonk | High-performance newsletters and mailing lists | AGPL-3.0 |
| Mautic | Full marketing automation | GPL-3.0+ |
| Notifuse | Newsletters and transactional email (BSL from v40) | BSL-1.1 (v40+) / AGPL-3.0 (earlier) |
| Sendportal | Laravel email marketing with tracking | MIT |
| Keila | Privacy-focused newsletters | AGPL-3.0 |
| Wraps | Code-first email on your own AWS SES | AGPL-3.0 + enterprise license |
How we chose these Klaviyo alternatives
We looked for open-source tools that send campaigns and automations like Klaviyo: lists, segmentation, templates, tracking, and a transactional API. We verified each project's license, recent activity, stars, and self-hosting in its repository. See our methodology for the full criteria.
Closest to Klaviyo
Mautic is the most complete: a marketing automation platform with lead management, visual campaign automation, email marketing, reporting, CRM integrations, and a plugin system. Listmonk is the most popular and focused on newsletters and mailing lists, as a single Go binary with Postgres.
Lighter and developer-oriented
Notifuse is a newsletter and transactional email platform with a visual MJML editor, A/B tests, and an API. Keila is a privacy-focused newsletter tool, Sendportal is a Laravel-based email tool with campaign tracking, and Wraps deploys to your own AWS account using SES with React-based templates.
Important: source-available licenses
Notifuse switched to the Business Source License 1.1 from version 40, so recent versions are not open source in the usual sense. Mautic and the others below are standard open-source licenses.
License details
Listmonk, Keila, and Wraps are AGPL-3.0. Mautic is GPL-3.0 or later. Sendportal is MIT. Notifuse is BSL-1.1 from v40 and AGPL-3.0 earlier.
Maintenance status
Listmonk, Mautic, Notifuse, Sendportal, and Wraps had commits within days of this update. Keila's last commit was in early October 2026.
Why look for a Klaviyo alternative?
Klaviyo is a proprietary platform priced by number of contacts, with your customer data and segments stored on its servers and ecommerce flows tied to its integrations. Open-source tools remove per-contact pricing and keep data on your servers, but you must provide the sending infrastructure and lose Klaviyo's ecommerce-specific analytics.
listmonk.app
AGPL-3.0 self-hosted newsletter and mailing-list manager built around PostgreSQL. It supports campaigns, subscribers, segmentation, templates, analytics, bounce handling, multiple SMTP providers, OIDC, S3-compatible media, and a transactional email API; it does not provide delivery infrastructure itself.
23.8K2.7KAGPL-3.0Self-hosted
Pricing: Free self-hosted software; connect an SMTP provider or mail server.
- High-performance single binary with PostgreSQL
- Campaigns, subscribers, segmentation, templates, and analytics
- Transactional API, multiple SMTP servers, bounce handling, and OIDC
- Newsletter-first rather than API-first
- Requires an external SMTP provider or mail server
- Less focused on developer experience and React Email than Resend
mautic.org
Mautic is an open-source marketing automation platform for managing leads and running campaigns, with lead management, email marketing, campaign automation, landing pages and forms, analytics and reporting, many integrations, and translations in 35+ languages. It is licensed under GPL-3.0 or later and can be self-hosted for free, with hosted and trial options from Mautic's partners.
10.8K3.5KGPL-3.0+Self-hosted
Pricing: Free to self-host; paid hosting and services are offered by Mautic and its partners.
- Mature marketing automation with campaigns and lead nurturing
- Email marketing, forms, and analytics
- Large community and integrations
- Marketing-only: it is not a sales CRM on its own
- Self-hosting and email deliverability need maintenance
notifuse.com
Self-hosted platform (Business Source License 1.1 from v40, AGPL-3.0 for earlier versions) for transactional email and marketing, including newsletters, visual MJML editing, A/B testing, segmentation, contact timelines, multiple workspaces, analytics, REST API, S3 integration, and multiple sending providers.
2.2K235BSL-1.1 (v40+) / AGPL-3.0 (earlier)Self-hosted
Pricing: Open-source self-hosted platform; configure a supported sending provider.
- Transactional API and newsletter campaigns
- Visual MJML editor, A/B testing, segmentation, and analytics
- Multiple sending providers, workspaces, and self-hosting
- More marketing-oriented than Resend
- Business Source License from v40, source available until it converts to AGPL
- Requires an underlying email sending provider
keila.io
Keila is an open-source email marketing and newsletter tool with full data ownership, advanced segmentation, customizable templates, automation workflows, analytics, an API, and GDPR compliance. It is licensed under AGPL-3.0 and can be self-hosted.
2.2K175AGPL-3.0Self-hosted
Pricing: Free self-hosted; hosted plans available.
- Full data ownership and a privacy focus
- Segmentation, templates, and automations
- Active development
- No built-in publishing site or paid memberships
- AGPL-3.0 license
sendportal.io
MIT self-hosted email marketing application built with Laravel, providing subscriber management, lists, segments, campaigns, tracking, workspaces, templates, and an API. It requires an external sending provider and has low recent development activity.
2.2K469MITSelf-hosted
Pricing: MIT self-hosted software; connect an email sending provider.
- Laravel-based MIT project
- Subscribers, lists, segments, campaigns, and workspaces
- Tracking, REST API, and self-hosting
- Low recent development activity
- Marketing-first, not a direct transactional API replacement
- Requires an external sending provider
wraps.dev
Wraps is a developer-friendly email platform where templates are React components and automations are written in TypeScript, deployed to your own AWS account with SES. The code is AGPL-3.0 with enterprise features under a commercial license, and AWS charges about $0.10 per 1,000 emails. It is a very young project.
648AGPL-3.0 + enterprise licenseSelf-hosted
Pricing: Free to start; AWS usage is billed to your account, and enterprise features are paid.
- Email as React components and TypeScript automations
- Runs in your own AWS account
- AGPL-3.0 core
- Requires an AWS account
- Very young project with about 63 stars
Compare Klaviyo alternatives
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| Listmonk | Newsletter manager | AGPL-3.0 | Yes | Newsletters at scale |
| Mautic | Marketing automation | GPL-3.0+ | Yes | Campaign automation |
| Notifuse | Email platform | BSL-1.1 (v40+) | Yes | Transactional and marketing |
| Sendportal | Email marketing | MIT | Yes | Laravel users |
| Keila | Newsletter tool | AGPL-3.0 | Yes | GDPR-minded teams |
| Wraps | Email platform | AGPL-3.0 | AWS account | Developers |
Which one should you choose?
Want the closest marketing automation platform
Mautic offers lead management, visual campaign automation, and CRM integrations.
Want fast newsletters and mailing lists
Listmonk is a single binary that handles large sends with a transactional API.
Want to send through your own AWS SES
Wraps deploys to your AWS account and uses React components for templates.
Want a privacy-focused newsletter tool
Keila focuses on data privacy with segmentation, automation workflows, and GDPR features.