Overview

MailWizz and Keila are both self-hosted email tools. MailWizz is a self-hosted PHP email marketing application with one-time license. Keila is a open-source email newsletter tool built with Elixir.

Approach

MailWizz is a commercial product with a one-time $86 license. It has been developed since 2013 with consistent feature additions including automation, A/B testing, and landing pages. Keila is completely free and focuses on open source.

Feature Comparison

MailWizz offers more out of the box: automation workflows, A/B testing, multiple delivery servers, white-label, and bounce management. Keila focuses on open source and eu hosting option.

Both require you to manage your own servers and configure email delivery. If you'd rather skip infrastructure management entirely, a managed platform like Sequenzy handles it all with SaaS-specific features like Stripe integration.

Making the Choice

Choose MailWizz for a feature-rich self-hosted email platform. Choose Keila for open source. For managed SaaS email, consider Sequenzy.

Technology Stack Comparison

Keila is built on Elixir and the BEAM virtual machine, which provides excellent concurrency and fault tolerance. The BEAM was designed for telecom systems where downtime is unacceptable, making Keila inherently reliable under load. MailWizz runs on PHP with MySQL, a proven but less concurrent stack that requires more resources for equivalent throughput.

For technically minded teams, the technology choice matters. Elixir applications handle concurrent connections efficiently, while PHP processes are more resource-intensive. If you are running on modest hardware, Keila may perform better per dollar of infrastructure.

Open Source vs Commercial License

Keila's open-source model means you can inspect the code, contribute fixes, and customize functionality without restriction. MailWizz's commercial license gives you the code but with usage restrictions. For organizations that require code auditing or need custom modifications, Keila's open-source approach provides more freedom.

However, MailWizz's commercial model funds dedicated development, resulting in a more feature-complete product. The tradeoff between open-source freedom and commercial feature depth is a classic one. Evaluate whether you need features like automation and A/B testing (MailWizz) or prioritize code transparency and customization (Keila).

EU Data Compliance

Keila offers EU hosting options, which is valuable for businesses subject to strict GDPR requirements. Hosting your email platform within the EU ensures data residency compliance without complex legal arrangements. MailWizz can be hosted anywhere you choose, including EU servers, but requires you to set up the infrastructure yourself.

For EU-based businesses or those serving EU customers, both platforms support compliant hosting. Keila's managed cloud option with EU hosting simplifies compliance. MailWizz gives you the freedom to choose any EU hosting provider but requires more setup effort.