#00519F
Closest named color: Cobalt (#1E488F). oklch(44.1% 0.144 254.7), rgb(0, 81, 159).
Aa
White text reads best on this color (7.84:1).
About this color
#00519F is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.144 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 7.84:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.67:1 |
| White text | 7.84:1 |
Values
| HEX | #00519F |
| RGB | rgb(0, 81, 159) |
| HSL | hsl(209, 100%, 31%) |
| OKLCH | oklch(44.1% 0.144 254.7) |
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 #00519F | 7.84:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #00519F | 2.67:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #00519F text on white | 7.84:1 | AAA | Lc 86.5 | Fine for body text |
| #00519F text on black | 2.67:1 | Fails | Lc -15.6 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F6
oklch(80.9% 0.083 254.3)
-
Step 400
400
#63A3F2
oklch(70.7% 0.134 254.6)
-
Step 500
500
#3389EE
oklch(63% 0.172 255)
-
Step 600
600
#0071D9
oklch(55.6% 0.181 254.6)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800 (this color)
#00519F
oklch(44.1% 0.144 254.7)
-
Step 900
900
#0C417B
oklch(37.7% 0.112 254.7)
-
Step 950
950
#0A2748
oklch(27.1% 0.07 254.2)
#00519F 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) | #2159A2 | 0.030 |
| Deuteranopia (no green cones) | #004C9D | 0.014 |
| Tritanopia (no blue cones) | #006470 | 0.107 |
| Achromatopsia (no color) | #525252 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00519F
#00519F
oklch(44.1% 0.144 254.7)
- #704A00
#704A00
oklch(44.1% 0.093 75.3)
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 #00519F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.036
- Light Navy #155084 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.058
- Sapphire #2138AB ΔE 0.064
- Blueberry #464196 ΔE 0.067
Use #00519F 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.