#00427D
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.116 252.7), rgb(0, 66, 125).
Aa
White text reads best on this color (10.11:1).
About this color
#00427D is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.116 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.008 away. White text reads best on it, at 10.11:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #00427D |
| RGB | rgb(0, 66, 125) |
| HSL | hsl(208, 100%, 25%) |
| OKLCH | oklch(37.9% 0.116 252.7) |
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 #00427D | 10.11:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #00427D | 2.07:1 | Fails | Lc 11.1 | Not readable |
| #00427D text on white | 10.11:1 | AAA | Lc 92.9 | Preferred for body text |
| #00427D text on black | 2.07:1 | Fails | Lc -9.6 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#98C4F8
oklch(80.8% 0.088 253)
-
Step 400
400
#5CA4F4
oklch(70.7% 0.139 252.5)
-
Step 500
500
#228AF0
oklch(63% 0.177 252.8)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900 (this color)
#00427D
oklch(37.9% 0.116 252.7)
-
Step 950
950
#062749
oklch(27.1% 0.073 252.8)
#00427D 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) | #21477F | 0.027 |
| Deuteranopia (no green cones) | #003D7C | 0.015 |
| Tritanopia (no blue cones) | #005059 | 0.085 |
| Achromatopsia (no color) | #424242 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00427D
#00427D
oklch(37.9% 0.116 252.7)
- #5C3A00
#5C3A00
oklch(37.9% 0.081 72.6)
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 #00427D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.008
- Cobalt #1E488F ΔE 0.040
- Marine Blue #01386A ΔE 0.042
- Light Navy #155084 ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.054
- Dusk Blue #26538D ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.071
Use #00427D 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.