kitio.aiDiagramming AI vs Mermaid Viewer
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Diagramming AI starts at See pricing page and Mermaid Viewer starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Prompt to diagram
- Five diagram engines
- Live preview
- Chat editing
- Excalidraw themes
- Read-only share links
- Live Mermaid preview
- Text-to-diagram AI
- Syntax error fixes
- SVG, PNG and PDF export
- Shared editing links
- Docker self-hosting
| Feature | Diagramming AI | Mermaid Viewer |
|---|---|---|
| Best for | Generate and edit Mermaid, PlantUML and Excalidraw diagrams by chat | Browser editor for Mermaid diagrams with AI code generation |
| Category | Design | Design |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | Yes |
| Made by | Diagramming AI | Mermaid Viewer |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Diagramming AI starts at See pricing page and Mermaid Viewer starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- 3 diagrams
- 5 AI conversations per day
- Watermarked low-res PNG
Starter
$69.99/yr billed yearly
- 30 diagrams
- 500 AI conversations per month
- High-res PNG without watermark
- 30 saved versions
Pro
$119.99/yr billed yearly
- Unlimited diagrams
- Unlimited AI conversations
- PNG, JPG, PDF and SVG export
- 100 saved versions
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Diagramming AI
- Supports five diagram formats
- Output stays editable as code
- Theme changes don't need regeneration
- Pricing is not shown on the homepage
- Share links are read-only
Mermaid Viewer
- No install, runs in the browser
- AI drafts diagram code from text
- Many export formats on paid plans
- Free plan allows only 3 diagrams
- Free exports are low-res and watermarked
- Monthly prices not shown, only yearly
Which one should you choose?
Choose Diagramming AI if you want:
- Supports five diagram formats
- Output stays editable as code
- Theme changes don't need regeneration
Watch out: pricing is not shown on the homepage.
Choose Mermaid Viewer if you want:
- No install, runs in the browser
- AI drafts diagram code from text
- Many export formats on paid plans
Watch out: free plan allows only 3 diagrams.
Diagramming AI vs Mermaid Viewer FAQ
What is the difference between Diagramming AI and Mermaid Viewer?
Diagramming AI: Generate and edit Mermaid, PlantUML and Excalidraw diagrams by chat. Mermaid Viewer: Browser editor for Mermaid diagrams with AI code generation. Both are design tools.
Is Diagramming AI or Mermaid Viewer cheaper?
Diagramming AI starts at See pricing page and Mermaid Viewer starts at See pricing page. Check both pricing pages for current plans.
Do Diagramming AI and Mermaid Viewer have free plans?
Diagramming AI: Yes. Mermaid Viewer: Yes.
Who makes Diagramming AI?
Diagramming AI is made by Diagramming AI.
Who makes Mermaid Viewer?
Mermaid Viewer is made by Mermaid Viewer.
Which should I choose, Diagramming AI or Mermaid Viewer?
Choose Diagramming AI if you value supports five diagram formats and output stays editable as code. Choose Mermaid Viewer if you value no install, runs in the browser and ai drafts diagram code from text.