#00519D
Closest named color: Cobalt (#1E488F). oklch(43.9% 0.141 254.2), rgb(0, 81, 157).
Aa
White text reads best on this color (7.88:1).
About this color
#00519D is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.141 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 7.88:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.66:1 |
| White text | 7.88:1 |
Values
| HEX | #00519D |
| RGB | rgb(0, 81, 157) |
| HSL | hsl(209, 100%, 31%) |
| OKLCH | oklch(43.9% 0.141 254.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #00519D | 7.88:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #00519D | 2.66:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #00519D text on white | 7.88:1 | AAA | Lc 86.6 | Fine for body text |
| #00519D text on black | 2.66:1 | Fails | Lc -15.4 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F5
oklch(80.9% 0.082 253.8)
-
Step 400
400
#64A3F1
oklch(70.7% 0.132 254.6)
-
Step 500
500
#338AEC
oklch(63.1% 0.169 254.2)
-
Step 600
600
#0072D8
oklch(55.7% 0.178 254.2)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800 (this color)
#00519D
oklch(43.9% 0.141 254.2)
-
Step 900
900
#0C417A
oklch(37.6% 0.111 254.4)
-
Step 950
950
#0A2747
oklch(27.1% 0.069 253.6)
#00519D with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2458A0 | 0.029 |
| Deuteranopia (no green cones) | #004C9C | 0.014 |
| Tritanopia (no blue cones) | #00646F | 0.106 |
| Achromatopsia (no color) | #515151 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00519D
#00519D
oklch(43.9% 0.141 254.2)
- #704900
#704900
oklch(43.9% 0.093 74.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #00519D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Dusk Blue #26538D ΔE 0.033
- Light Navy #155084 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.055
- Denim Blue #3B5B92 ΔE 0.057
- Sapphire #2138AB ΔE 0.066
- Blueberry #464196 ΔE 0.067
Use #00519D in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.