| What it does | Free on-screen measuring tools that run in your browser
| Full-screen white light in your browser
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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 | Free
| Free
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| Pricing | Not given
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| Key features | - Actual-size ruler in cm, mm and inches
- Bank-card and screen-diagonal calibration
- Top, left and right rulers with drag-to-measure readout
- Full-screen mode and browser-zoom warning
- Image measurement tool
- Length unit converter
- Touch dragging support for phones and tablets
- Local storage of calibration without server uploads
| - Full-screen white light display
- Adjustable color temperature from 2,000 K to 9,000 K
- Brightness control
- Timer functionality
- Keep screen on to prevent dimming
- Dead pixel test with five colors
- Refresh rate testing
- Keyboard shortcuts for quick access
- Multiple color options
- Download images in multiple resolutions
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| What makes it different | - Calibration step compensates for browsers' inability to detect physical display size
- ISO/IEC 7810 ID-1 standard bank card calibration ensures reproducible accuracy
- All calculations run locally in your browser with no data sent to servers
- Works on any device with a browser and JavaScript enabled
- Content follows standards-based principles with no invented precision or fake reviews
| - Runs entirely in browser with no app or sign-up required
- Works on iPhone and Android when added to home screen
- Completely free with no paid plans or subscriptions
- Customizable warmth and brightness for different uses
- Multiple screen test and diagnostic tools included
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 0 |
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| Citation Flow (Majestic) | 18 | 0 |
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| Referring domains (Majestic) | 10 | 0 |
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Online Ruler
White Screens