6 Best Open Source Klaviyo Alternatives
A curated collection of the 6 best open source and self-hosted alternatives to Klaviyo in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Klaviyo in 2026? The top open-source alternative is Listmonk — Self-hosted newsletter and mailing list manager.
Other highly rated open-source Klaviyo alternatives include Mautic, Notifuse and Keila.
Self-hosted newsletter and mailing list manager
listmonk is a high-performance, self-hosted newsletter and mailing list manager designed for sending both email campaigns and transactional emails. Built as a single binary application, it offers robust features while maintaining minimal resource usage. - High Performance: Multi-threaded, multi-SMTP email queues with sliding window rate limiting for fine-grained control. Single binary with minimal CPU and memory footprint. - Campaign Management: Create and manage one-way mailing lists with millions of subscribers. Supports single and double opt-in lists with SQL-based querying and segmentation. - Analytics Dashboard: Built-in analytics to visualize campaign performance, bounces, top links, and more across campaigns. - Flexible Templating: Powerful dynamic email templates using Go templating language. Supports HTML drag-and-drop builder, WYSIWYG editor, Markdown, raw HTML, or plain text. - Transactional Emails: Simple API to send arbitrary transactional messages using pre-defined templates. Supports multiple delivery mediums including SMS and WhatsApp via webhooks. - Extensible Architecture: Messenger HTTP webhooks enable integration with SMS, WhatsApp, FCM notifications, or any custom messaging interface. Extensive API coverage for all features. - Privacy Controls: Full privacy control for subscribers with granular subscriber management. - Authentication: OIDC SSO authentication with fine-grained role-based access control. listmonk is a single binary application that can be deployed anywhere. It requires PostgreSQL for data storage and supports installation via: - Direct binary downloads for Linux, macOS, Windows, FreeBSD, NetBSD, and OpenBSD - Docker containers with provided docker-compose.yml - One-click deployments on multiple hosting providers including Nodion, Kloudbean, Northflank, Railway, Zenith, PikaPods, Elestio, Zeabur, Cloudzy, and LumaDock Installation involves generating a configuration file, setting up the database, and running the binary. The application runs on port 9000 by default.
Open source marketing automation platform
Mautic is a free and open source marketing automation platform designed to help businesses automate email campaigns, manage leads, and engage customers effectively. Built for privacy and transparency, Mautic offers a self-hosted solution that eliminates reliance on third-party vendors and ensures full control over your marketing data. - Email Marketing Automation: Create and automate personalized email campaigns with advanced segmentation and scheduling. - Lead Management: Track, score, and nurture leads through customizable workflows and automation rules. - Customer Journey Builder: Design multi-channel customer journeys with drag-and-drop simplicity. - Analytics & Reporting: Gain insights into campaign performance with detailed analytics and customizable dashboards. - Integration Hub: Connect with CRM systems, CMS platforms, and other tools via extensive API support and pre-built integrations. - Self-Hosting: Deploy on your own infrastructure for complete data ownership and compliance with privacy regulations. - Community-Driven: Backed by a global community of developers and contributors, ensuring continuous innovation and support. - Multi-Channel Campaigns: Engage audiences across email, SMS, social media, and web push notifications. Mautic is a PHP-based application that can be self-hosted on any server supporting PHP and MySQL/MariaDB. It supports Docker for simplified deployment and is compatible with major cloud providers. The platform is designed for scalability, making it suitable for businesses of all sizes. For those preferring managed solutions, third-party hosting providers offer turnkey Mautic installations with enterprise-grade support.
Open-source email platform for newsletters
Notifuse is a modern, self-hosted emailing platform that allows you to send newsletters and transactional emails at a fraction of the cost. It provides a visual MJML editor, A/B testing, analytics, and seamless integrations with industry-leading email delivery providers. - Visual Email Builder: Drag-and-drop editor with MJML components and real-time preview for creating stunning, responsive emails. - Transactional API: REST API for sending transactional emails with responsive templates. - Opens & Click Tracking: Real-time analytics with detailed open rates, click tracking, and engagement metrics. - A/B Testing: Built-in A/B testing for subject lines, content, and send times to optimize campaigns. - Contact Profiles & Timeline: Rich contact profiles with custom fields and complete activity history. - Notification Center: Self-service portal for contacts to manage subscriptions and preferences. - Real-time Segmentation: Segment contacts by properties, activities, and subscriptions for targeted campaigns. - User Permissions: Granular workspace-level access control with multiple roles for team collaboration. - Workspaces: Multi-tenant architecture with custom domains and isolated data for agencies. - Automations: Event-driven workflows built on contact timeline for automated sequences. - S3 File Manager: Integrated file management with S3-compatible storage for images and attachments. Notifuse is open-source and can be self-hosted. It supports integration with multiple email delivery providers including SparkPost, Postmark, Mailjet, Mailgun, and Amazon SES. The platform is designed for scalability and flexibility, making it suitable for both individual users and agencies.
Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.
Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.
Open source self-hosted email marketing
SendPortal is a modern, open-source email marketing platform designed for self-hosting. It provides a cost-effective alternative to services like MailChimp, allowing businesses to manage newsletters, campaigns, and subscriber lists while maintaining full control over their data. - Self-Hosted & Open Source: Deploy on your own infrastructure for complete data ownership. - Multi-Provider Support: Works with AWS SES, Mailgun, Sendgrid, Postmark, and Mailjet. - Subscriber & List Management: Import/export subscribers via API or CSV, create custom segments. - Campaign Management: Design and send beautiful email campaigns with customizable templates. - Message Tracking: Monitor opens, clicks, bounces, and unsubscribes automatically. - Multiple Workspaces: Manage multiple teams or projects within a single interface. - Unlimited Users & Subscribers: No artificial limits on users, subscribers, or messages. - Powerful API: Integrate seamlessly with existing workflows and applications. - Cost Savings: Significantly cheaper than MailChimp, Campaign Monitor, and similar services. SendPortal is built with Laravel and can be installed as a package or via Docker. It requires a database (MySQL/PostgreSQL) and a mail delivery service (e.g., AWS SES). Full documentation is available at SendPortal Docs.
Self-hosted email platform for Amazon SES
Wraps is an open-source email infrastructure platform designed to simplify Amazon SES deployment and management. It provisions SES, DynamoDB, Lambda, and other AWS services into your account with a single command, enabling you to send emails while maintaining full control over your data and costs. - One-Command Deployment: Instantly deploy SES, DynamoDB, Lambda, and IAM roles with wraps email init. - Type-Safe SDK: Send emails with full TypeScript type inference using the @wraps.dev/email SDK. - Templates-as-Code: Store and version email templates directly in your repository. - Real-Time Analytics: Track every email send with live analytics powered by your own DynamoDB tables. - Reputation Protection: Automatic bounce and complaint handling with suppression to prevent re-sends. - Zero Stored Credentials: Access via OIDC-federated IAM roles—your AWS keys never leave your account. - Workflows & Automation: Build and automate email workflows with visual editors and TypeScript. - Cost Efficiency: Pay AWS directly at $0.10 per 1,000 emails, significantly lower than competitors. Wraps operates on a Bring Your Own Cloud (BYOC) model, where the control plane (dashboard, templates, workflows) is hosted by Wraps, while the data plane (SES, DynamoDB, Lambda) runs entirely in your AWS account. This ensures: - Full Data Ownership: Your email delivery data remains in your AWS account. - AWS Cost Transparency: You pay AWS directly for sending costs. - Open Source Core: The platform is open-source under AGPL-3.0, with the option to use Wraps-hosted services for convenience.
About Klaviyo
Advanced email marketing and SMS platform that uses customer data to create personalized campaigns, automate workflows, and drive revenue growth for ecommerce businesses.