| What it does | See why colors work
| Free online tools for flowcharts, charts, diagrams and timelines with no sign-up
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: Original view, Temperature map, Value structure, Saturation map, Palette and Harmony for every image, 20 analyses at a time. Lifetime Premium: one-time purchase includes Composition guides, Contrast map, tinted value bands, unlimited history, full-res export. No subscription.
| 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 | - Palette with proportions showing dominant colors sized by image weight
- Color harmony identification (Complementary, Analogous, Triadic, Split-complementary, Tetradic, Square, Monochromatic)
- Temperature map showing warm and cool distribution across image
- Value structure divided into clear zones (light, mid-tone, dark)
- Saturation map showing vivid and muted areas
- Composition guides identifying classic guides like golden ratio and rule of thirds
- Contrast map showing where the eye lands first (Premium)
- Painter-friendly color names (Yellow Ochre, Payne's Gray, etc.)
- Local device processing with no image uploads
- Works offline with no account required
| - 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
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| What makes it different | - Shows color proportions, not just colors, recognizing that a 60/5 split is fundamentally different from 50/50
- Four layers of analysis together show relationships single layers cannot reveal
- Built by people who actually mix paint with painter-friendly vocabulary
- Lifetime Premium with single payment, no subscription model
- All data stays on device, no account signup required
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 8 ▲ +1 (up) since last check | 3 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 4 | 0 |
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| Citation Flow (Majestic) | 32 | 19 |
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| Referring domains (Majestic) | 31 | 4 |
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Undertone
Diagram Smith