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Should I use MJML?

The only framework that makes responsive email easy - mjml.io

Worth it. Free, open-source framework that turns simple markup into responsive HTML email — a clear win if your team codes. Skip it if you need drag-and-drop editing, vendor support SLAs, or fast security patches.

Confidence

Medium. Based on 40+ public sources; many review snippets were truncated, so pricing and some quotes are partial.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in sources
  • Security posture

Pricing

$0

Open-source framework

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
MJML APINot public in reviewed sources

Best for

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

Not for

  • 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

Gotchas - check before you buy

high

Open source means no SLA; fixes depend on maintainers — one CVE reportedly unfixed since 2020

high

Patch mjml-core: mj-include directory traversal can expose files to untrusted input (CVE-2025-67898)

low

MJML API pricing isn't listed in reviewed sources; verify cost before committing

Pros and cons

Pros

  • Free, open-source core framework
  • Compiles to email-client-compatible responsive HTML
  • Users report it beats Zurb Foundation in speed
  • Paid API renders responsive emails programmatically
  • 326 companies tracked using it

Cons

  • Requires coding; no drag-and-drop editing
  • Directory traversal flaw in mjml-core (CVE-2025-67898)
  • 2020 CVE reportedly still unfixed as of Nov 2025
  • Marketers can't self-serve; developers become the bottleneck

Sources & method

Analyzed 9/26/2026 - 12 sources - Active CVE history; latest is a directory traversal in mjml-core (CVE-2025-67898, Dec 2025), and a 2020 CVE is reported unfixed.

official x3review x3security x3news x3
  • CVE-2025-67898 — directory traversal in mjml-core, mj-include allows directory traversal; affected mjml-core versions disclosed Dec 2025.
  • CVE-2020-12827 reportedly unfixed, GitHub issue from Nov 2025 states this older CVE remains unfixed in the npm package.
  • CVE-2024-26151 — mjml-python, Vulnerability in the Python wrapper package, tracked by NIST Feb 2024.

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 12

    Sources

  • Analyzed

  • Value for money: 5/5. Core framework costs nothing; open source
  • Ease of use: 4/5. Makes responsive email coding far simpler
  • Feature depth: 4/5. Components, custom components, rendering API
  • Support quality. No support evidence in sources
  • Security posture: 2/5. Directory traversal CVE; older CVE reportedly unfixed
  • Free Core price Open-source framework
  • Mailjet Created by Open-sourced at launch
  • 326 Companies using Tracked by TheirStack
  • 3 Known CVEs cited npm core ×2, Python wrapper ×1

Pricing

Open-source framework

$0

  • Full component library
  • CLI build tools
  • Community support via GitHub

MJML API

Not public in reviewed sources

  • REST email rendering
  • Responsive email as a service

Security

Active CVE history; latest is a directory traversal in mjml-core (CVE-2025-67898, Dec 2025), and a 2020 CVE is reported unfixed.

  • CVE-2025-67898 — directory traversal in mjml-coremj-include allows directory traversal; affected mjml-core versions disclosed Dec 2025.⁷
  • CVE-2020-12827 reportedly unfixedGitHub issue from Nov 2025 states this older CVE remains unfixed in the npm package.⁸
  • CVE-2024-26151 — mjml-pythonVulnerability in the Python wrapper package, tracked by NIST Feb 2024.⁹

Companies that use it

  • Cowrywise12
Full analysis

Based on 40+ public sources; many review snippets were truncated, so pricing and some quotes are partial.

Free open-source framework for responsive emails. Great if your devs code; skip if you want no-code or SLAs.

Methodology

Based on 40+ public sources; many review snippets were truncated, so pricing and some quotes are partial.

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

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