kitio.aiDiagram Generator vs OnUML
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Diagram Generator starts at $9/mo and OnUML starts at See pricing page. Check both pricing pages for current plans.
Creates flowcharts, ER diagrams and infographics from a text prompt
Freemium · $9/moAt a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Text to diagram
- Editable Mermaid output
- Web-grounded content
- 10+ visual styles
- Up to 4K export
- Text or image to diagram
- Mermaid and PlantUML editors
- Draw.io canvas mode
- Editable mind maps
- AI code repair
- MCP server
| Feature | Diagram Generator | OnUML |
|---|---|---|
| Best for | Creates flowcharts, ER diagrams and infographics from a text prompt | AI diagram maker for Mermaid, PlantUML, Draw.io and mind maps |
| Category | Design | Design |
| Pricing model | Freemium | Freemium |
| Starting price | $9/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Diagram Generator | OnUML |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Diagram Generator starts at $9/mo and OnUML starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Developer
Free
- 5 one-time Pro credits
- All diagram types
- Up to 2K, watermarked
Starter
$9/mo
- 100 Pro credits a month
- No watermark
- Commercial license
Professional
$35/mo
- 400 Pro credits a month
- 4K generation
- Priority support
Prices in USD, checked Nov 5, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Diagram Generator
- Choice of code or image output
- Pulls in current data
- Many diagram types
- Free credits are one-time only
- 4K output needs the top plan
- Still in public beta
OnUML
- Four diagram formats in one place
- Fixes broken diagram code
- Free daily credits
- Pricing hidden behind sign-in
- Daily free credits are small
- Formal UML still needs some know-how
Which one should you choose?
Choose Diagram Generator if you want:
- Choice of code or image output
- Pulls in current data
- Many diagram types
Watch out: free credits are one-time only.
Choose OnUML if you want:
- Four diagram formats in one place
- Fixes broken diagram code
- Free daily credits
Watch out: pricing hidden behind sign-in.
Diagram Generator vs OnUML FAQ
What is the difference between Diagram Generator and OnUML?
Diagram Generator: Creates flowcharts, ER diagrams and infographics from a text prompt. OnUML: AI diagram maker for Mermaid, PlantUML, Draw.io and mind maps. Both are design tools.
Is Diagram Generator or OnUML cheaper?
Diagram Generator starts at $9/mo and OnUML starts at See pricing page. Check both pricing pages for current plans.
Do Diagram Generator and OnUML have free plans?
Diagram Generator: Yes. OnUML: Yes.
Who makes Diagram Generator?
Diagram Generator is made by Diagram Generator.
Who makes OnUML?
OnUML is made by OnUML.
Which should I choose, Diagram Generator or OnUML?
Choose Diagram Generator if you value choice of code or image output and pulls in current data. Choose OnUML if you value four diagram formats in one place and fixes broken diagram code.