Mermaid | Diagramming and charting tool
Worth it
Confidence: Medium
Buy if you're a developer or docs team that wants diagrams as versioned text . it's free, open source, and embedded everywhere.
New check
Comparison
Mermaid | Diagramming and charting tool vs draw.io
Mermaid | Diagramming and charting tool and draw.io both land on Worth it.
draw.io
Worth it
Confidence: Medium
Buy if you need capable, free diagramming. especially inside Confluence/Jira or where data privacy matters.
| Compare | Mermaid | Diagramming and charting tool | draw.io |
|---|---|---|
| Verdict | Worth it | Worth it |
| Best for | Developer docs and READMEs | Atlassian Confluence/Jira teams |
| Who it's not for | Non-technical teams wanting pure drag-and-drop | Teams wanting Miro-style real-time brainstorm whiteboards |
| Privacy | 13 public CVEs; recent 2025 XSS issues are medium severity . patch promptly if you embed Mermaid. | Strong local-data privacy model; several patched CVEs exist . keep versions current.⁸ |
| Support quality | No support evidence in reviewed sources. | No support evidence in sources |
| Public sentiment | Users value Mermaid as a lightweight, text-driven way to keep diagrams current, especially in docs and design reviews.13 | Users consistently praise ease of use, shape libraries, and diagram range; G2 sentiment is positive but the small Trustpilot sample is lukewarm. |
| Biggest gotcha | 13 CVEs on record; 2025 XSS flaws need prompt patching, especially with untrusted input⁶ | Versions under 18.0.0 vulnerable to stored XSS . do not run old builds² |
Pick Mermaid | Diagramming and charting tool when
- Developer docs and READMEs
- Markdown-native teams
- Architecture and sequence diagrams
- Git-versioned diagram workflows
When Mermaid | Diagramming and charting tool is not a fit
- Non-technical teams wanting pure drag-and-drop
- Polished sales or marketing visuals
- Apps rendering untrusted diagram input unpatched
- Teams needing vendor support SLAs
Pick draw.io when
- Atlassian Confluence/Jira teams
- Engineers diagramming architecture, UML, networks
- Privacy-sensitive orgs wanting local storage
- Any team needing free diagramming
When draw.io is not a fit
- Teams wanting Miro-style real-time brainstorm whiteboards
- Buyers needing vendor SLAs or dedicated enterprise support
- Guess: non-technical execs wanting polished presentation-grade visuals
- Self-hosters unwilling to keep versions patched
Sources
- Mermaid official sitemermaid.js.orgofficial
- mermaid-js/mermaid on GitHubgithub.comofficial
- Google Workspace Marketplace listing (4.4/5, 111 reviews)workspace.google.comreview
- TechCrunch on Mermaid Charttechcrunch.comnews
- Pulse2 . Mermaid Chart profile, 8M userspulse2.comnews
- SentinelOne . CVE-2025-54881sentinelone.comsecurity
- VulDB . CVE-2025-54880vuldb.comsecurity
- NVD search . Mermaid CVEsnvd.nist.govsecurity
- OpenCVE . 13 Mermaid CVEsopencve.alliance.unm.edusecurity
- Mermaid security pagemermaid.js.orgsecurity
- JetBrains WebStorm Mermaid.js supportblog.jetbrains.comnews
- Grafana Mermaid plugin docsgrafana.comofficial
- Stanley Lim . Why I choose Mermaidblog.stanleylim.mereview
- Reddit r/ProductManagement threadreddit.comreview
- Mermaid cheatsheet . 19 diagram typesmermandraw.comreview
- Microsoft engineering playbookmicrosoft.github.ioofficial