Cobalt Color — #0047AB HEX Code
Cobalt uses #0047AB, or RGB(0, 71, 171), in this color catalog. Explore complementary colors, palettes and text contrast below.
Color Wheel
Colors adjacent on the wheel create a serene, comfortable palette. Ideal for nature-inspired designs and cohesive UI themes. Explore analogous harmonies for Cobalt.
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Colors adjacent on the wheel create a serene, comfortable palette. Ideal for nature-inspired designs and cohesive UI themes.
Cobalt
#0047AB
Cobalt color reference
Updated
Cobalt is our deep saturated blue reference. Cobalt pigments and branded color systems may differ; identify this HEX when comparing it with royal blue.
This descriptive name identifies our chosen sRGB swatch, not a CSS keyword or a universal material standard.
- HEX — exact
- #0047AB
- RGB — exact 8-bit channels
- 0, 71, 171
- HSL — rounded
- 215°, 100%, 34%
What is the complementary color?
An HSL hue rotation of 180° gives #AD6500, keeping the rounded saturation and lightness values. This reference calculation rounds HSL before converting back to RGB. It is a digital harmony starting point, not a pigment-mixing rule or a guarantee of readable text.
Black or white text on Cobalt?
AA requires at least 4.5:1 for normal text. Results use opaque colors and unrounded contrast values; a passing pair does not establish complete accessibility.
Use #0047AB in a real interface
Exact match in the Color Match reference list: Cobalt. Reference names are browsing labels; not every name is a CSS keyword.
This value meets normal-text AA against white. Try it as a text or action-surface candidate and test the states around it.
A passing foreground/background check covers that pair only. Inspect focus, hover and meaningful boundaries against their actual neighbors.
Assign roles and check the pair
The lightest and darkest supplied values are the starting reading pair. The accent label adds black or white, whichever has greater contrast. You can change the accent below.
A palette in context
Use this preview to inspect reading text and an accent label.
Example actionReading text #0047AB on #FFFFFF: 8.436:1 - Pass normal text AA.
Accent label #FFFFFF on #0047AB: 8.436:1.
Checks use unrounded ratios and opaque sRGB. The example action is a visual sample. Test boundaries, focus and hover in your actual component.
All color pairs: normal text AA
| Text / background | #0047AB | #FFFFFF |
|---|---|---|
| #0047AB | 1.00:1 Fail | 8.44:1 Pass |
| #FFFFFF | 8.44:1 Pass | 1.00:1 Fail |
:root {
--surface: #FFFFFF;
--text: #0047AB;
--accent: #0047AB;
--on-accent: #FFFFFF;
}Shades & Tints
Tints (Adding White)
Shades (Adding Black)
Theme Palettes
Pastel
Vintage
Neon
Dark Mode
Nature
Live Website Preview
Preview your landing page
See your selected colors on headings, surfaces and example actions.
Accessibility
Text contrast on Cobalt
Each sample uses this color as the background. Results describe opaque text contrast, not the accessibility of a whole design.
White text
A normal-size text example.
#FFFFFF on #0047AB
WCAG: 8.436:1
Normal text: AAA. Large text: AAA.
APCA: -92.81 Lc (supplementary).
Inspect this pair and find a fixBlack text
A normal-size text example.
#000000 on #0047AB
WCAG: 2.489:1
Normal text: Fail. Large text: Fail.
APCA: 15.83 Lc (supplementary).
Inspect this pair and find a fixAA needs 4.5:1 for normal text and 3:1 for large text. Large text is at least 24 CSS px, or about 18.67 CSS px and bold. Methods and limitations
Vision Simulator
Normal Vision
Vision: Viénot 1999 + Machado 2009. Environment: approximate perceptual simulation.
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