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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. official
  2. official
  3. official
  4. review
  5. review
  6. review
  7. security
  8. security
  9. security
  10. news
  11. news
  12. news

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