Free online tools for flowcharts, charts, diagrams and timelines with no sign-up
Design system extraction from live websites for AI agents
Stage
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Founded
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Based in
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Pricing model
Freemium
Free
Pricing
Free: no account required, all diagram and chart makers, PNG/SVG/PDF export, no watermark. Pro: Monthly $9.99 a month, Yearly $99.99 a year with 7-day free trial, Lifetime $239.99 once. Euro area: €10.99 a month, €109.99 a year, €259.99 once (VAT included).
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Key features
Flowchart and process diagram maker with canvas and text-to-diagram modes
Text-to-diagram tools for UML, ER and sequence diagrams
Chart tools: pie chart, line graph, gauge and Sankey diagram
Automatic diagram layout from typed text
Export to PNG, SVG and PDF without watermark
Share diagrams with share links
Pro: editable .drawio export and vector PDF
Pro: multi-page documents and layers
Diagram checks for unlabelled branches and dead ends
Works on phone and computer
Extracts computed styles from rendered websites
Analyzes sites at desktop and mobile sizes in light and dark mode
Matches fonts to @font-face rules
Traces colors back to CSS variables
Generates DESIGN.md files in YAML format
Measures type, spacing, radii and shadows as exact computed values
Publishes raw data as JSON
What makes it different
Completely free with no account required and no watermark on exports
Nothing uploaded: all work stays on your device in your browser
Results computed by the same tested code, not manually typed
Multiple export formats: PNG at 4 sizes, SVG and PDF
Converts between formats: Mermaid to draw.io, SQL to ER, Visio to flowchart
DOM-true values from actually rendered pages, not estimates or screenshots
Designed specifically for AI agents to read and use in coding
Free and requires no account or login
Open to search engines and AI crawlers with no restrictions
Diagram Smith
Emblematic