OnUml
AI-nativeAI Diagram Generator for Mermaid, PlantUML, Draw.io, and Mind Maps
onuml.com Productivity & Collaboration / Whiteboards & Diagrams
- Monthly visits
- 11.6K
- Up31.1%MoMOct 2026
- Public revenue
- Undisclosed
- No public revenue evidence yet
- Entry price
- $4/mo
- Lower than 89% of peersNiche median $9/mo
- Launched
- 20mo ago
- 2025-03-25 · Est.
Traffic
Marketing moves
Launches, search & content, referrals, promotionsLaunched on Fazier (22 upvotes · 3 comments)Launch
OnUml — AI-Powered Mermaid UML Generator
Sep 17, 2025 · 14mo agoLaunch page
Launched on LaunchIgniter (1 upvotes)Launch
onuml — Simple UML AI Diagram Assistant
Jun 19, 2025 · 17mo agoLaunch page
Launched on V2EX (1 thanks · 7 comments)Launch
基于 mermaid 实现了一个 uml 的画图工具,基本原理就是基于大模型,通过聊天的方式生成 mermaid 代码,然后使用解析器去渲染图片。 功能虽小但是也调试了一个多月了。前期使用的 trae ,后面老是排队,且使用的确实不太顺手,后面充值了 cursor 开发的。一…
Apr 6, 2025 · 20mo agoLaunch page
Launched on Product HuntLaunch
AI-powered UML diagram generator for free
Mar 25, 2025 · 20mo agoLaunch page
Third-party reviews & case dossiers
Acquisition breakdowns, engineer reviews & open-source metrics- What engineers like:
- Here’s its features: Enterprise-Grade UML Solution – A professional AI-powered platform for UML modeling. AI Smart Chat – Generate UML diagrams instantly by describing requirements in natural language. Smart Suggestions – Receive intelligent design recommendations for improved diagram creation. Multi-diagram Support – Create different types of UML diagrams with automatic type recommendations. Real-time Rendering – WYSIWYG editing with instant visual updates. Diagram Export – Export diagrams in PNG, SVG, and other formats for easy sharing. Code Editor – Lightweight editor with smart code hints for efficient editing.
- Best suited for:
- Quickly drafting class diagrams, flowcharts, sequence diagrams, and more Iterate and visualize changes without switching tools Edit Mermaid.js syntax online Ensures your diagrams render correctly Manage your diagrams for reuse and sharing
Traffic sources
Traffic breakdown
Channels
- Direct40%
- Organic Search34%
- Referrals10%
- Social6%
- Other10%
Countries
- Russia21%
- Vietnam18%
- United States18%
- Indonesia16%
- India9%
Search
Domain authority —Domain registered 2025-02-28
| Keyword | Monthly volume |
|---|---|
| onuml | 190 |
| rfr crfxfnm gyu d planty uml | 180 |
| how to add c4/c4_container into plantuml intelijit | 160 |
| how to download image from plantuml | 50 |
| plantuml mermaid | — |
Traffic data: Vaneform
Pricing
Trial: None · Free tier included · 2 paid tiers ($4–$8) · Observed 2026-10-30 · Source page
Entry price $4/mo, Lower than 89% of peers; “Whiteboards & Diagrams” median is $9/mo.View pricing benchmark
Pages & changes
Key pages
Weekly snapshotsChanges
No pricing, plan, or positioning changes detected since tracking started.
Design
Minimal Monochrome (Light canvas, airy density) featuring centered headline + cta layout and pure typography & geometry visuals.
First-screen preview · click to zoom
First-screen pitch & conversion flow
“AI Diagram Generator for Mermaid, Plant UML, Draw.io, and Mind Maps”
Centered Headline + CTA hero structure paired with start free / sign up CTA and no explicit trust bar.
Conversion path: Centered Headline + CTA + Pure Typography & Geometry → Start Free / Sign Up
- Category Positioning Anchor
Palette · click to copy
- Typography
- 7.0
- Color & Contrast
- 7.0
- Layout & Spacing
- 7.0
- Craft & Polish
- 6.0
- Distinctiveness
- 5.0
Structure
- Fonts
- Inter
- Hero layout
- Centered Headline + CTA
- Primary visual
- Pure Typography & Geometry
- Conversion CTA
- Start Free / Sign Up
- Social proof
- No Explicit Trust Bar
- Navigation
- Full-Width Top Bar
- Theme & density
- Light · Airy
- Corners & depth
- Pill · With shadow
Preview full AI design brief (includes :root CSS variables & layout rules)Style tokens only; never copy brand names, logos, copy, or images
# Design Brief: Minimal Monochrome
Monochrome palette with a single accent color, hairline dividers, and generous whitespace.
## Design Tokens
```css
:root {
--background: #fafbfc;
--surface: #fffaeb;
--foreground: #18212b;
--muted-foreground: #717982;
--accent: #101526;
--radius: 9999px;
--font-heading: "Inter", ui-sans-serif, system-ui, sans-serif;
--font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
}
```
Color area ratio: Background #FAFBFC (~84%) · Surface #FFFAEB (~5%) · Text #18212B (~8%) · Muted Text #717982 (~2%) · Accent #101526 (~1%). Background and surface dominate the canvas; reserve the accent color for primary buttons and active states.
## Layout & Conversion Structure
- Hero layout: Centered Headline + CTA
- Navigation: Full-Width Top Bar
- Theme & density: Light · Airy
- Border radius & elevation: Pill; use elevation shadows to separate layers
- Primary visual medium: Pure Typography & Geometry
- Conversion CTA: Start Free / Sign Up
- Headline hook: Category Positioning Anchor
- Spatial layout notes: Centered Headline + CTA hero structure paired with start free / sign up CTA and no explicit trust bar.
- Visual summary: Minimal Monochrome (Light canvas, airy density) featuring centered headline + cta layout and pure typography & geometry visuals.
## Avoid
- Multi-stop neon gradients
- Heavy drop shadows
- More than one competing accent color
Implement the UI following the design tokens and layout specifications above: use only these color variables, and reserve the accent color strictly for primary actions and active states. Adopt only this visual style—never copy any reference product’s brand name, logo, copy, or imagery.
Questions & evidence
- How much does OnUml cost?
- Free: Free; Pro: $4/mo; Pro with credits: $8/mo. Observed 2026-10-30. Check the source for current billing terms, usage limits and taxes.Source
- How much website traffic does OnUml get?
- Vaneform estimates 11.6K website visits in 2026-10. Visits can include repeat visits; this estimate measures web traffic separately from paying customers or revenue.Source
- What is OnUml and what platforms does it support?
- OnUml is catalogued under Whiteboards & Diagrams: AI Diagram Generator for Mermaid, PlantUML, Draw.io, and Mind Maps. Supported platforms: Web.
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These products share a catalog category. Compare customer tasks, features and deployment requirements before treating them as alternatives.
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