#004183
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.125 255), rgb(0, 65, 131).
Aa
White text reads best on this color (10.07:1).
About this color
#004183 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.125 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 10.07:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #004183 |
| RGB | rgb(0, 65, 131) |
| HSL | hsl(210, 100%, 26%) |
| OKLCH | oklch(38.1% 0.125 255) |
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 #004183 | 10.07:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #004183 | 2.08:1 | Fails | Lc 11.2 | Not readable |
| #004183 text on white | 10.07:1 | AAA | Lc 92.7 | Preferred for body text |
| #004183 text on black | 2.08:1 | Fails | Lc -9.7 | Not readable |
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 900.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DCFC
oklch(88.6% 0.052 254.7)
-
Step 300
300
#97C4FD
oklch(80.9% 0.094 254.6)
-
Step 400
400
#5BA2FC
oklch(70.6% 0.151 255.3)
-
Step 500
500
#1F88FA
oklch(63.2% 0.193 254.9)
-
Step 600
600
#0071DB
oklch(55.7% 0.183 255)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900 (this color)
#004183
oklch(38.1% 0.125 255)
-
Step 950
950
#05264C
oklch(27% 0.08 254.9)
#004183 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) | #184885 | 0.026 |
| Deuteranopia (no green cones) | #003D82 | 0.011 |
| Tritanopia (no blue cones) | #00515B | 0.094 |
| Achromatopsia (no color) | #424242 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004183
#004183
oklch(38.1% 0.125 255)
- #5B3B00
#5B3B00
oklch(38% 0.08 74.8)
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 #004183, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Cobalt #1E488F ΔE 0.035
- Light Navy #155084 ΔE 0.048
- Marine Blue #01386A ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.058
- Dusk Blue #26538D ΔE 0.063
- Sapphire #2138AB ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.075
Use #004183 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.