Products

OnUml

AI-native

AI Diagram Generator for Mermaid, PlantUML, Draw.io, and Mind Maps

onuml.com Productivity & Collaboration / Whiteboards & Diagrams

AI Benchmark
Desktop
Mobile
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
Creators
rexue123
No social account linkedCo-created with sen yu
Launched
20mo ago
2025-03-25 · Est.

Traffic

Monthly visitsData through Oct 2026
Events1 marketing move

Marketing moves

Launches, search & content, referrals, promotions
X accounts@onuml
  • Launched on DevHuntLaunch

    OnUml — AI-Powered Mermaid UML Generator

    Jan 6 · 10mo agoLaunch page

  • Launched 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
Fazier
2025-09-17Source
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

Oct 2026

Traffic breakdown

Channels

  • Direct40%
  • Organic Search34%
  • Referrals10%
  • Social6%
  • Other10%

Countries

  • Russia21%
  • Vietnam18%
  • United States18%
  • Indonesia16%
  • India9%

Search

Domain authority —Domain registered 2025-02-28

KeywordMonthly volume
onuml190
rfr crfxfnm gyu d planty uml180
how to add c4/c4_container into plantuml intelijit160
how to download image from plantuml50
plantuml mermaid—

Traffic data: Vaneform

Pricing

Free
Free
2 workspaces · Monthly included credits: None
Pro
$4/mo
Monthly included credits: None
Pro with credits
$8/mo
Monthly included credits: 500 credits

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

Tracked since 2025-03-25

Key pages

Weekly snapshots
onuml.com/ Snapshot 2026-11-02

Changes

No pricing, plan, or positioning changes detected since tracking started.

Design

First-screen visual analysis & :root CSS

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

5-D design score6.5 / 10
Typography
7.0
Color & Contrast
7.0
Layout & Spacing
7.0
Craft & Polish
6.0
Distinctiveness
5.0

Structure

Fonts
Inter
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.

Related products in this category

Productivity & Collaboration / Whiteboards & Diagrams

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