Mermaid Viewer vs Raygun (2026): Pricing, Features & Which to Choose

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: Raygun does not list a price
Free plan
Mermaid Viewer
Only Mermaid Viewer has one
Higher rating
Mermaid Viewer
4.0 against 3.8
Same job?
Yes
Both are Coding tools

Side by side

Compared on	Mermaid Viewer	Raygun
Our rating	4.0Better	3.8
Starts at	$5.83/mo	Not listed
Free plan	YesBetter	No
Category	Coding	Coding
Plans	From $5.83/mo	See pricing
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	Crash reporting with error detection and diagnosis AI Error Resolution suggesting fixes Real User Monitoring for front-end performance Application performance monitoring for server-side visibility Support across web and mobile applications
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	Front-end and back-end monitoring in one platform, so causes link to symptoms AI Error Resolution targets the fix, not just the diagnosis Real user data rather than synthetic lab measurements
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	Overlaps heavily with observability tools many teams already run Crash payloads can carry user data - review before deploying Costs scale with error and session volume
Company	MermaidViewer	Raygun

Prices come from each vendor's pricing page, last checked 20260831. Check the vendor before you buy.

FAQ

Questions people ask

Is Mermaid Viewer better than Raygun?

In our reviews Mermaid Viewer scores 4.0 and Raygun scores 3.8. The better pick depends on the job. Mermaid Viewer: Live Mermaid editing with GPT-4 generation, over a renderer that is free elsewhere. Raygun: Crash reporting, real user monitoring and APM in one platform, with AI Error Resolution suggesting fixes for the errors it catches.

Which is cheaper, Mermaid Viewer or Raygun?

Mermaid Viewer: from $5.83/mo. Raygun: see pricing.

Do Mermaid Viewer and Raygun have free plans?

Only Mermaid Viewer has a free plan.

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