kitio.aiChatFlowchart vs OnUML
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. ChatFlowchart starts at $9.90 one-time and OnUML 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
- Text to diagram
- Image and PDF to editable diagram
- Edit by chat
- Draw.io, Mermaid and Excalidraw export
- Flowchart animation video
- Text or image to diagram
- Mermaid and PlantUML editors
- Draw.io canvas mode
- Editable mind maps
- AI code repair
- MCP server
| Feature | ChatFlowchart | OnUML |
|---|---|---|
| Best for | Makes editable flowcharts from text, images and PDFs | AI diagram maker for Mermaid, PlantUML, Draw.io and mind maps |
| Category | Design | Design |
| Pricing model | Freemium | Freemium |
| Starting price | $9.90 one-time | See pricing page |
| Free plan | Yes | Yes |
| Made by | ChatFlowchart | OnUML |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
ChatFlowchart starts at $9.90 one-time and OnUML starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- Core AI diagram features
- No login required
- Watermarked PNG export
10-Credit Pack
$9.90 one-time
- 10 extra AI generations
- Credits never expire
Pro
$15.90/mo
- Unlimited AI diagrams
- Unlimited image-to-flowchart
- No-watermark HD exports
30-Day Pass
$19.90 one-time
- Pro access for 30 days
- Does not renew
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
ChatFlowchart
- Converts old diagram images to editable ones
- Exports to Draw.io and Mermaid
- Free use without signup
- Free exports are watermarked PNGs
- Tax or VAT added at checkout
- Complex diagrams may need manual cleanup
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 ChatFlowchart if you want:
- Converts old diagram images to editable ones
- Exports to Draw.io and Mermaid
- Free use without signup
Watch out: free exports are watermarked pngs.
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.
ChatFlowchart vs OnUML FAQ
What is the difference between ChatFlowchart and OnUML?
ChatFlowchart: Makes editable flowcharts from text, images and PDFs. OnUML: AI diagram maker for Mermaid, PlantUML, Draw.io and mind maps. Both are design tools.
Is ChatFlowchart or OnUML cheaper?
ChatFlowchart starts at $9.90 one-time and OnUML starts at See pricing page. Check both pricing pages for current plans.
Do ChatFlowchart and OnUML have free plans?
ChatFlowchart: Yes. OnUML: Yes.
Who makes ChatFlowchart?
ChatFlowchart is made by ChatFlowchart.
Who makes OnUML?
OnUML is made by OnUML.
Which should I choose, ChatFlowchart or OnUML?
Choose ChatFlowchart if you value converts old diagram images to editable ones and exports to draw.io and mermaid. Choose OnUML if you value four diagram formats in one place and fixes broken diagram code.