Responsive HTML email is still a different discipline from ordinary web design. Gmail, Outlook, Apple Mail, and mobile clients do not support the same CSS in the same way, so the safest starting point is usually a framework or template library built specifically for email.
This 2026 list focuses on resources that are useful now rather than preserving legacy tools simply because they appeared in older roundups. The right choice depends on whether you want raw HTML, a developer framework, or a visual builder.
Quick Picks by Use Case
- Best developer-friendly framework: MJML
- Best modern Tailwind/Vue workflow: Maizzle
- Best minimal battle-tested patterns: Cerberus
- Best no-code builder for teams: Stripo
- Best visual editor for fast campaign design: Beefree
- Best collaborative design-to-HTML workflow: Tabular
1. MJML
MJML is an open-source markup language designed specifically for responsive email. Instead of hand-coding the table-heavy HTML required for wide client compatibility, you write higher-level MJML components and compile them into email-ready HTML.
Best for: developers and teams that want repeatable components without maintaining raw table markup.
2. Maizzle
Maizzle is a developer framework for building HTML email. Maizzle 6 is a major rewrite powered by Vite, uses Vue for templating, and uses Tailwind CSS 4 for email styling. Older articles describing Maizzle as only a PostHTML/Tailwind workflow are now outdated.
Best for: frontend teams already comfortable with component-based development and modern build tooling.
3. Cerberus
Cerberus provides a small set of responsive email patterns rather than a giant theme marketplace. That is useful when you want to understand and control the HTML instead of depending on a complex editor.
Best for: developers who want a clean baseline for common one-column, multi-column, and hybrid layouts.
4. Stripo
Stripo is a visual email builder with a large template library and export/integration options for many email platforms. It is a practical choice when marketers need to design without working directly in HTML but the team still wants portable output.
Best for: marketing teams creating many campaign variations.
5. Beefree
Beefree is a visual email and landing-page builder aimed at collaborative campaign production. It works well when the priority is editing speed, reusable content blocks, and handing designs between marketers rather than writing code.
Best for: no-code and mixed marketing/design teams.
6. Tabular
Tabular combines visual email design with reusable components and HTML export. It is useful when a team wants a design-system approach without building its own email framework from scratch.
Best for: teams that need repeatable branded templates and collaboration.
7. Email on Acid Resources
Email on Acid is primarily an email testing platform, but its resources and examples are useful when template choice is closely tied to rendering tests. The main value is not the number of designs; it is the ability to validate what the email looks like across clients.
8. Litmus Resources
Litmus is another email-testing platform with educational template and coding resources. It is especially helpful when building an internal email-design process around previews, QA, accessibility, and client compatibility.
9. ESP-Native Template Libraries
Mailchimp, Brevo, MailerLite, HubSpot, Klaviyo, and other email platforms include their own template libraries. These are often the fastest option when the campaign will never leave that platform because the editor and output are tested inside the same system.
For a broader platform comparison, see email marketing platforms for small businesses.
10. Open-Source Starter Templates
GitHub repositories around MJML, Maizzle, Cerberus, and other email projects can be useful sources of reusable starters, but check recent commits and issue activity before adopting a template. A repository that rendered well five years ago may not reflect current email-client behavior or current project tooling.
How to Choose a Template Source
If you send occasionally
Use your ESP's built-in templates or a visual builder such as Stripo or Beefree. The time saved is usually more valuable than owning the raw build system.
If you ship many campaigns
Use MJML, Maizzle, or a controlled component system. Reusable components reduce QA work and keep brand changes consistent across campaigns.
If Outlook compatibility is critical
Favor conservative layouts and test real output. Complex CSS that works on the web can still degrade in desktop Outlook environments.
Template QA Checklist
- Send a real test, not only an editor preview.
- Check desktop and mobile layouts.
- Test image-blocked states and write useful alt text.
- Check dark-mode behavior where relevant.
- Use readable font fallbacks. See best fonts for business email.
- Keep important text in HTML rather than only inside images.
- Verify that every CTA and tracking link resolves correctly.
- Check unsubscribe and required footer content before sending.
Design Is Not a Substitute for Deliverability
A beautifully coded template cannot compensate for poor authentication, high complaint rates, or a low-quality database. If campaign performance changed after importing an old list, separate template problems from contact-data problems before drawing conclusions. See email deliverability best practices.
Frequently Asked Questions
What is the easiest free way to build a responsive HTML email?
For a non-developer, start with the visual builder already inside the email platform or use a dedicated visual tool. For developers, MJML is one of the simplest ways to generate responsive email HTML from a component-oriented syntax.
Is MJML still maintained?
Yes. MJML remains an active open-source framework for responsive email and continues to be widely used in email-development workflows.
What changed in Maizzle 6?
Maizzle 6 is a major rewrite built around Vite, Vue templates, and Tailwind CSS 4. Teams using older Maizzle versions should review the current upgrade guidance rather than assuming old project structure still applies.
Do I need a separate template builder if my ESP has one?
Not necessarily. A separate builder matters when you need portability, reusable design systems across platforms, collaboration outside the ESP, or more control over generated HTML.
Should I paste raw HTML into every email platform?
Only if the platform supports it and the template has been tested there. Some editors modify imported HTML, so always send a real test after importing.
Bottom Line
Choose the least complicated workflow that reliably produces email-client-safe output. Occasional senders usually benefit from a visual builder or ESP-native templates. High-volume teams benefit more from reusable frameworks such as MJML or Maizzle. Whatever you choose, treat rendering QA as part of the build process rather than an afterthought.
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