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Head to head · 2026

Mermaid Viewer vs Sherloq

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

Mermaid Viewer

Live Mermaid editing with GPT-4 generation, over a renderer that is free elsewhere

4.0$5.83/mo

Visit Mermaid Viewer (opens Mermaid Viewer in a new tab)

Sherloq

SQL help inside the editor you already use, with no data connection at all

4.0Free

Visit Sherloq (opens Sherloq in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: Sherloq does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    Tie

    4.0 against 4.0

  • Same job?

    Yes

    Both are Coding tools

Side by side

Compared onMermaid ViewerSherloq
Our rating4.04.0
Starts at$5.83/moFree
Free planYesYes
CategoryCodingCoding
PlansFrom $5.83/moFree
Key features
  • Live preview while typing Mermaid code
  • GPT-4 generation from a plain text description
  • Syntax error detection with suggested fixes
  • SVG, PNG and PDF export with resolution and theme control
  • Docker self-hosting with access controls
  • AI SQL chat inside the code editor
  • Query management with version control
  • Team sharing and permissions
  • Chrome extension and IntelliJ plugin
  • Free SQL validator, formatter and visual ERD tool
Pros
  • Self-hosted Docker option for diagrams that cannot leave the network
  • AI generation covers the syntax people never remember
  • Text-defined diagrams version and review like code
  • No data integration, so no security review before trying it
  • Version control fixes SQL scattered across Slack and notebooks
  • Y Combinator-backed and SOC 2 certified
Cons
  • Mermaid renders free in GitHub, VS Code, Notion and the official editor
  • Free tier caps at 3 diagrams and watermarks every export
  • Paid plans are annual only, with no monthly option
  • Enterprise pricing not published
  • No data connection means it cannot see your schema unless you show it
  • The certificate covers the apex domain only; www fails validation
CompanyMermaidViewerSherloq

Prices come from each vendor's pricing page, last checked 20260819. Check the vendor before you buy.

FAQ

Questions people ask

Is Mermaid Viewer better than Sherloq?

In our reviews Mermaid Viewer scores 4.0 and Sherloq scores 4.0. The better pick depends on the job. Mermaid Viewer: Live Mermaid editing with GPT-4 generation, over a renderer that is free elsewhere. Sherloq: SQL help inside the editor you already use, with no data connection at all.

Which is cheaper, Mermaid Viewer or Sherloq?

Mermaid Viewer: from $5.83/mo. Sherloq: free.

Do Mermaid Viewer and Sherloq have free plans?

Yes, both have a free plan.

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