Keila and Listmonk are both open-source (AGPLv3), self-hostable email newsletter platforms, but they target different operating models. Listmonk is free…
Best for Keila: Privacy- and GDPR-focused senders who want either free self-hosting or a managed EU-hosted option (Keila Cloud, from €8/month for 2,000 emails), plus form-builder features like signup forms with captcha and double opt-in.
Best for Listmonk: Technical teams sending to very large lists who want a single-binary, self-hosted deployment with multi-threaded SMTP queues built to scale to millions of subscribers, and who don't need a managed cloud option.
At a Glance
Keila
Listmonk
Primary category
Email Marketing
Email Marketing
Rating
Not documented
Not documented
Pricing model
Open Source (self-hosted); Subscription (Keila Cloud)
Keila: Keila offers "Keila Cloud," a paid managed service hosted on EU (Germany/France) infrastructure starting at €8/month for 2,000 emails (Keila XS plan).
Listmonk: Listmonk has no official managed cloud version from its maintainers; self-hosting is the only supported deployment, though third-party hosts like Railway and Northflank offer one-click deployments.
Teams without server-ops resources need a supported managed option instead of managing infrastructure themselves.
Sending Scale
Keila: Keila's Cloud plans list tiers up to Keila XXL, 250,000 emails/month at €256/month, with no stated subscriber ceiling for self-hosting.
Listmonk: Listmonk documents multi-threaded SMTP queues with rate limiting "designed to handle mailing lists with millions of subscribers."
Sending scale and throughput architecture matter for very large lists.
Pricing Structure
Keila: Keila's self-hosted version is free, but Keila Cloud is tiered by monthly email volume (€8 to €256/month across six plans, XS through XXL).
Listmonk: Listmonk has no pricing plans at all — it is completely free with no paid tier.
Predictable free-forever software vs. a paid managed-service ladder changes total cost of ownership as sending volume grows.
Form Builder & Personalization
Keila: Keila documents a form builder with bot protection (captcha, double opt-in) and Liquid templating for dynamic personalized content.
Listmonk: Listmonk's documented features focus on a drag-and-drop and Go-template-based email builder without a named signup-form builder.
Signup form quality affects list growth and spam/bot protection at the point of capture.
Analytics Privacy Controls
Keila: Keila documents "privacy-first analytics" with the explicit option to disable tracking entirely.
Listmonk: Listmonk documents built-in campaign analytics for opens, clicks, bounces, and link performance without mentioning a tracking opt-out.
The ability to fully disable tracking matters for GDPR-strict or privacy-focused senders.
Feature-by-Feature
Deployment & Hosting
Feature
Keila
Listmonk
Self-hosting
Available
Available
Managed cloud option
Available
Unavailable
Database requirement
Not documented
Available
Sending & Campaigns
Feature
Keila
Listmonk
High-throughput sending (millions of subscribers)
Not documented
Available
Transactional email API
Available
Available
Segmentation
Available
Not documented
Form builder with bot protection
Available
Not documented
Licensing & Analytics
Feature
Keila
Listmonk
License
Available
Available
Privacy-first / disable tracking
Available
Not documented
REST API for integrations
Available
Not documented
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Keila
Self-Hosted — Free Free forever (Docker)
Keila Cloud XS — EUR 8/month Monthly
Keila Cloud S — EUR 16/month Monthly
Keila Cloud M — EUR 32/month Monthly
Keila Cloud L — EUR 64/month Monthly
Keila Cloud XL — EUR 128/month Monthly
Keila Cloud XXL — EUR 256/month Monthly
Listmonk
Open Source — Free N/A
Pros & Cons
Keila
Pros
100 percent open source with no proprietary premium features
Self-hosted version is free and functionally identical to paid Keila Cloud
EU-hosted managed option in Germany and France supports strict GDPR compliance
Privacy-first analytics that can be fully disabled
Bring-your-own email provider flexibility
Cons
No permanent free tier for the managed Keila Cloud service
Smaller community and fewer integrations than Mailchimp or Mautic
Fewer built-in automation workflows than competitors like Mailcoach
Newer and less production-hardened than more established open-source tools like Listmonk
Self-hosting requires familiarity with Elixir and Docker
Listmonk
Pros
Completely free and open source with no per-subscriber or send-volume pricing
Extremely lightweight single-binary deployment that runs on minimal server resources
Proven at large scale in production at Zerodha, sending millions of emails monthly
Full data ownership of subscriber information, useful for privacy and compliance needs
Powerful SQL-based segmentation not commonly available in hosted SaaS competitors
Cons
Requires self-hosting and basic server administration, unlike fully managed SaaS tools
No built-in SMTP delivery service; users must configure and pay for a separate email relay
Smaller ecosystem of templates, integrations, and marketplace apps than Mailchimp or Klaviyo
No official managed cloud version, so support relies on community channels and documentation
SQL-based segmentation has a steeper learning curve than simple SaaS filter dropdowns
Use Cases
Choose Keila: Privacy- and GDPR-focused senders who want either free self-hosting or a managed EU-hosted option (Keila Cloud, from €8/month for 2,000 emails), plus form-builder features like signup forms with captcha and double opt-in.
Choose Listmonk: Technical teams sending to very large lists who want a single-binary, self-hosted deployment with multi-threaded SMTP queues built to scale to millions of subscribers, and who don't need a managed cloud option.
Need both: There isn't a realistic scenario for running both in parallel — both solve the same self-hosted newsletter problem, so a team would typically standardize on one rather than operate both concurrently; at most, a team might trial Keila Cloud's managed hosting before migrating to a self-hosted Listmonk instance once volume justifies running their own infrastructure.
Keila
GDPR-conscious European newsletters — EU businesses and nonprofits send newsletters through EU-hosted infrastructure to meet strict privacy requirements.
Self-hosted developer newsletter — Developers and open-source projects self-host Keila for full control with no per-contact fees.
Nonprofit and advocacy campaigns — Nonprofits and community groups run email campaigns while respecting subscriber privacy.
Listmonk
High-volume newsletter publishing — Publishers and companies with very large subscriber lists avoid escalating per-subscriber SaaS fees by self-hosting Listmonk instead.
Transactional and marketing email consolidation — Engineering teams route both triggered transactional emails and marketing campaigns through one self-hosted platform via the API.
Privacy-focused subscriber data ownership — Organizations with compliance or privacy requirements self-host to keep full control of subscriber PII rather than storing it with a third-party SaaS.
Frequently Asked Questions
Is Keila or Listmonk free?
Both offer free, open-source (AGPLv3) self-hosted versions. Keila additionally sells a paid managed option, Keila Cloud, starting at €8/month; Listmonk has no paid tier at all.
Which tool handles larger subscriber lists?
Listmonk documents multi-threaded SMTP sending queues designed to scale to millions of subscribers. Keila's documented Cloud plans top out at 250,000 emails/month (Keila XXL, €256/month) for the managed option.
Does either tool offer managed hosting?
Keila does, via Keila Cloud on EU (Germany/France) infrastructure. Listmonk does not offer an official managed version, though third-party platforms like Railway and Northflank provide one-click deployments.
Can I disable tracking for privacy compliance?
Keila explicitly documents privacy-first analytics with the option to disable tracking entirely. Listmonk's documented analytics feature does not mention a tracking opt-out.
What database does each require for self-hosting?
Listmonk requires PostgreSQL, per its documentation. Keila's specific database requirement isn't documented in the available facts.
Which is better for building signup forms?
Keila documents a dedicated form builder with bot protection (captcha, double opt-in). Listmonk's documented feature set does not include a named form-builder tool.