# 5 Best Open Source Alternatives for Klaviyo

Canonical: https://caniforkit.com/klaviyo
Last updated: 2026-11-07

Looking for the best open source alternative for Klaviyo? Compare 5 verified free and open source alternatives to Klaviyo (Listmonk, Mautic, Notifuse) with license details, self-hosting requirements, and practical trade-offs.

## Klaviyo Overview & Subscription Cost
- **Product**: Klaviyo
- **Category**: [seo & marketing](https://caniforkit.com/category/seo-marketing)
- **Paid Subscription Price**: $49/month per seat
- **1-Seat Annualized Cost**: $588/year
- **5-Person Team Annualized Cost**: $2,940/year
- **10-Person Team Annualized Cost**: $5,880/year
- **Can I Vibe-Code / Rebuild It Myself?**: NO (use a free alternative, save the tokens)
- **Rebuild Verdict**: Instead of paying recurring SaaS fees for Klaviyo or rebuilding it from scratch, deploy one of the 5 battle-tested open-source alternatives like Listmonk.

## Verified Free & Open Source Alternatives

| Alternative | Type | License | Runs On | GitHub Stars | Head-to-Head |
| --- | --- | --- | --- | --- | --- |
| [Listmonk](https://caniforkit.com/fork/listmonk) | Open Source | AGPL-3.0 | Self-host | ★ 24.2k | [Compare vs Klaviyo](https://caniforkit.com/vs/klaviyo-vs-listmonk) |
| [Mautic](https://caniforkit.com/fork/mautic) | Open Source | GPL-3.0+ | Self-host | ★ 10.9k | [Compare vs Klaviyo](https://caniforkit.com/vs/klaviyo-vs-mautic) |
| [Notifuse](https://caniforkit.com/fork/notifuse) | Open Source | AGPL-3.0 | Self-host | ★ 2.3k | [Compare vs Klaviyo](https://caniforkit.com/vs/klaviyo-vs-notifuse) |
| [Sendportal](https://caniforkit.com/fork/sendportal) | Open Source | Open Source | Self-host | ★ 2.2k | [Compare vs Klaviyo](https://caniforkit.com/vs/klaviyo-vs-sendportal) |
| [Keila](https://caniforkit.com/fork/keila) | Open Source | AGPL-3.0+ | Self-host | ★ 2.3k | [Compare vs Klaviyo](https://caniforkit.com/vs/klaviyo-vs-keila) |

## In-Depth Alternative Profiles

### Listmonk
- **Fork Page**: [Listmonk Profile](https://caniforkit.com/fork/listmonk)
- **Head-to-Head Comparison**: [Klaviyo vs Listmonk](https://caniforkit.com/vs/klaviyo-vs-listmonk)
- **Official Website**: https://listmonk.app/
- **Source Code Repository**: https://github.com/knadh/listmonk
- **License**: AGPL-3.0
- **Runs On**: Self-host
- **GitHub Stars**: 24.2k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Send email campaigns and transactional messages to millions of subscribers with a single high-performance binary backed by Postgres.
- **The Catch vs Klaviyo**: listmonk is fast and explicit about subscriber states, but it lacks Brevo's managed deliverability, broad automation suite, CRM-style contact tools, and polished visual workflow builder.
- **Installation**: Docker Compose or a single release binary plus PostgreSQL
- **Setup**: You still need a PostgreSQL database and a trustworthy SMTP/API sender with authenticated DNS.
- **Data Storage**: Subscribers, campaigns, templates, and analytics live in a PostgreSQL database on your server.

### Mautic
- **Fork Page**: [Mautic Profile](https://caniforkit.com/fork/mautic)
- **Head-to-Head Comparison**: [Klaviyo vs Mautic](https://caniforkit.com/vs/klaviyo-vs-mautic)
- **Official Website**: https://www.mautic.org
- **Source Code Repository**: https://github.com/mautic/mautic
- **License**: GPL-3.0+
- **Runs On**: Self-host
- **GitHub Stars**: 10.9k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, self-host, real ops
- **Summary**: Mautic is a free and open source marketing automation platform that helps businesses manage leads, create campaigns, and analyze results.
- **The Catch vs Klaviyo**: Mautic can match deep automation, but the user must operate the application, database, cron, upgrades, backups, mail transport, and deliverability stack.
- **Installation**: Download the production package or install with Composer, then configure PHP, a database, cron, and a mail transport
- **Setup**: The first wall is not the installer but production operation: PHP and database tuning, several cron jobs, HTTPS, backups, upgrades, SMTP/API sending, and DNS authentication.
- **Data Storage**: Contacts, segments, campaigns, events, and reports live in the configured MySQL or MariaDB database; assets, configuration, logs, and queue files live on the server filesystem.

### Notifuse
- **Fork Page**: [Notifuse Profile](https://caniforkit.com/fork/notifuse)
- **Head-to-Head Comparison**: [Klaviyo vs Notifuse](https://caniforkit.com/vs/klaviyo-vs-notifuse)
- **Official Website**: https://www.notifuse.com
- **Source Code Repository**: https://github.com/notifuse/notifuse
- **License**: AGPL-3.0
- **Runs On**: Self-host
- **GitHub Stars**: 2.3k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Free open-source email platform for newsletters and transactional emails. Self-hosted alternative to Mailchimp with visual MJML editor, A/B testing, and analytics.
- **The Catch vs Klaviyo**: Notifuse is newer and narrower, without ActiveCampaign's mature CRM, predictive features, and thousand-plus integration ecosystem.
- **Installation**: Hosted signup, or one application container plus PostgreSQL for self-hosting
- **Setup**: Self-hosting still needs Docker, PostgreSQL, a public HTTPS endpoint, an SMTP or API sending provider, and correctly authenticated sending domains.
- **Data Storage**: Self-hosted contacts, campaigns, automations, and events live in PostgreSQL; files can use S3-compatible storage, and the configured email provider receives message payloads. Hosted data lives in Notifuse's cloud.

### Sendportal
- **Fork Page**: [Sendportal Profile](https://caniforkit.com/fork/sendportal)
- **Head-to-Head Comparison**: [Klaviyo vs Sendportal](https://caniforkit.com/vs/klaviyo-vs-sendportal)
- **Official Website**: https://sendportal.io
- **Source Code Repository**: https://github.com/mettle/sendportal
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 2.2k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Open-source email marketing platform offering unlimited subscribers, campaigns, and workspaces. Self-hosted solution with powerful API and beautiful interface.
- **The Catch vs Klaviyo**: Requires self-hosting setup, updates, and server maintenance compared to managed Klaviyo.
- **Installation**: Clone https://github.com/mettle/sendportal or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Keila
- **Fork Page**: [Keila Profile](https://caniforkit.com/fork/keila)
- **Head-to-Head Comparison**: [Klaviyo vs Keila](https://caniforkit.com/vs/klaviyo-vs-keila)
- **Official Website**: https://keila.io
- **Source Code Repository**: https://github.com/pentacent/keila
- **License**: AGPL-3.0+
- **Runs On**: Self-host
- **GitHub Stars**: 2.3k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.
- **The Catch vs Klaviyo**: Keila gives you a friendly campaign editor and tracking, but delivery reputation, SMTP configuration, backups, and upgrades become your responsibility rather than Campaign Monitor's.
- **Installation**: Keila Cloud signup or Docker image plus PostgreSQL
- **Setup**: Self-hosting requires Docker, PostgreSQL, a public HTTPS domain, and credentials for SMTP, SES, SendGrid, Mailgun, or Postmark.
- **Data Storage**: Self-hosted subscribers, campaigns, and job state live in PostgreSQL; uploaded campaign assets live on persistent server storage.

## Frequently Asked Questions

### What is the best free alternative to Klaviyo?
The top free alternative to Klaviyo is Listmonk (open source, AGPL-3.0). Send email campaigns and transactional messages to millions of subscribers with a single high-performance binary backed by Postgres. Other popular Klaviyo replacements include Mautic, Notifuse, Sendportal.

### How much does switching from Klaviyo to a free alternative save?
Klaviyo starts at $49/month per seat ($588/year). Switching a 5-person team to a free alternative like Listmonk saves $2,940 per year in software subscription fees.

### What is the catch when switching away from Klaviyo?
While Listmonk replaces core Klaviyo features without subscription fees, the real-world trade-off is: listmonk is fast and explicit about subscriber states, but it lacks Brevo's managed deliverability, broad automation suite, CRM-style contact tools, and polished visual workflow builder.

## Related

- [seo & marketing Software Category Hub](https://caniforkit.com/category/seo-marketing)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Self-Hosted Software Directory](https://caniforkit.com/self-hosted)
- [Homepage](https://caniforkit.com)