How do their growth rates compare?

ChatUML has a month-over-month growth rate of +7.2%; Orca has +1%.

How does pricing compare?

ChatUML: Freemium. Freemium: a free tier provides basic use of the AI diagram generator, with paid options available for heavier usage. Check the site's pricing page for current tier limits and rates. Orca: Free, Open Source, Enterprise on request. Orca is free and open source; the download and core product require no payment. A separate Enterprise offering is available, priced by contacting the team. The site does not publish a public price list for enterprise plans.

What are alternatives to ChatUML and Orca?

Other tools in related categories include Miro, Cursor, Google Antigravity, Devin, Whimsical.

ChatUML vs Orca — Traffic (14.83K vs 1.03M), Pricing & Verdict

Open AI Tools

ChatUML vs Orca — Traffic (14.83K vs 1.03M), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	ChatUML	Orca
Official Domain	chatuml.com	onorca.dev
Pricing Model	Freemium	Free, Open Source, Enterprise on request
Monthly Visits	14.83K (14,829)	1.03M (1,025,891)
MoM Traffic Delta	+991 (+7.2%)	+9.97K (+1%)
Primary Market & Share	🇺🇸 United States (18.3%)	🇺🇸 United States (15.9%)
Direct Visits / mo	5.93K	344.59K
User Rating	4.2	4.6
Supported Platforms	Website	Website

ChatUML

Describe your system in words, get a diagram you can edit

Natural language to diagram

Describe actors, steps and relationships in a sentence and receive a structured, editable diagram instead of drawing boxes by hand.

Broad diagram coverage

Supports the notations software teams actually use — UML class and use-case diagrams, sequence diagrams, flowcharts, BPMN process maps, C4 architecture views and mindmaps.

Text-based diagram source

Diagrams are stored as readable text notation, which makes them easy to diff, review and keep in version control alongside the code.

Iterative refinement

Keep chatting with the assistant to add participants, split flows or restyle the render without starting the diagram over.

Strengths & Pros

+Removes the manual shape-dragging step entirely — you type, it draws
+Covers the diagram types engineering teams need, including sequence, BPMN and C4
+Text-based source makes diagrams diffable and suitable for version control
+Editor loads quickly in a browser with no local installation