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MJML vs Foundation

MJML lands on Worth it, and Foundation lands on Depends.

MJML

mjml.io

Worth it
Confidence: Medium

Free, open-source framework that turns simple markup into responsive HTML email . a clear win if your team codes.

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MJML versus Foundation
CompareMJMLFoundation
VerdictWorth itDepends
Best forDev teams hand-coding responsive emailsFront-end devs building custom responsive sites
Who it's not forNon-technical marketers wanting drag-and-dropNon-developers . there's no visual builder here
PrivacyActive CVE history; latest is a directory traversal in mjml-core (CVE-2025-67898, Dec 2025), and a 2020 CVE is reported unfixed.⁷Official security page published; one CVE (2020-26304) appears in NVD against Foundation.14
Support qualityNo support evidence in sourcesNo usable review evidence
Public sentimentDevelopers praise MJML for fast, responsive email coding, while acknowledging it still requires code.⁴No usable reviews for this Foundation were found; G2 and Reddit results cover construction software, a TV series, and makeup.16
Biggest gotchaOpen source means no SLA; fixes depend on maintainers . one CVE reportedly unfixed since 2020⁸Name collision: searching docs, plugins, or reviews returns construction software, TV shows, and makeup16

Pick MJML when

  • Dev teams hand-coding responsive emails
  • SaaS products rendering emails via API
  • Agencies producing many custom templates
  • Cost-conscious teams avoiding builder SaaS fees

When MJML is not a fit

  • Non-technical marketers wanting drag-and-drop
  • Teams needing vendor SLAs or paid support
  • Regulated orgs needing rapid security patches
  • One-off senders . use your ESP's built-in editor

Pick Foundation when

  • Front-end devs building custom responsive sites
  • Agencies needing a brandable grid and components
  • Teams wanting markup control over utility-class CSS

When Foundation is not a fit

  • Non-developers . there's no visual builder here
  • Quick landing pages; a site builder is faster
  • Teams who prefer utility-first CSS (use Tailwind instead)
  • Anyone wanting actively developed tooling (Guess: project is in maintenance mode)

Sources

  1. MJML . The Responsive Email Frameworkmjml.io
    official
  2. mjmlio/mjml on GitHubgithub.com
    official
  3. MJML API . Responsive Email as a Servicemjml.io
    official
  4. MJML Reviews . G2g2.com
    review
  5. The pros and cons of MJML (2026 version) . Scaleroscalero.io
    review
  6. Email Designers . Zurb Foundations or MJML? . Redditreddit.com
    review
  7. Directory Traversal in mjml-core . Snyksecurity.snyk.io
    security
  8. CVE-2025-67898 / CVE-2020-12827 unfixed . GitHub issuegithub.com
    security
  9. CVE-2024-26151 Detail . NVDnvd.nist.gov
    security
  10. Mailjet's MJML Launches . VentureBeatventurebeat.com
    news
  11. Companies that use MJML (326) . TheirStacktheirstack.com
    news
  12. How we Simplified Our Email Design Workflow With MJML . Cowrywiseinside.cowrywise.com
    news
  13. Foundation product security pagefoundation.zurb.com
    security
  14. NVD-CVE-2020-26304 - NISTnvd.nist.gov
    security
  15. Foundation case studies showcaseget.foundation
    official
  16. FOUNDATION Reviews 2026: Details, Pricing, & Featuresg2.com
    review