#00436D
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.093 244.9), rgb(0, 67, 109).
Aa
White text reads best on this color (10.37:1).
About this color
#00436D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.093 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.37:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.37:1 |
Values
| HEX | #00436D |
| RGB | rgb(0, 67, 109) |
| HSL | hsl(203, 100%, 21%) |
| OKLCH | oklch(37% 0.093 244.9) |
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 #00436D | 10.37:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #00436D | 2.02:1 | Fails | Lc 10.4 | Not readable |
| #00436D text on white | 10.37:1 | AAA | Lc 93.5 | Preferred for body text |
| #00436D text on black | 2.02:1 | Fails | Lc -9.0 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DDF2
oklch(88.6% 0.039 244.6)
-
Step 300
300
#9BC6EB
oklch(80.9% 0.07 244.8)
-
Step 400
400
#60A7E1
oklch(70.6% 0.112 245)
-
Step 500
500
#2890D9
oklch(63.1% 0.143 244.9)
-
Step 600
600
#0079BF
oklch(55.7% 0.14 245)
-
Step 700
700
#0065A1
oklch(49% 0.124 245.1)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900 (this color)
#00436D
oklch(37% 0.093 244.9)
-
Step 950
950
#072941
oklch(27.1% 0.059 244.2)
#00436D 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) | #2E456F | 0.037 |
| Deuteranopia (no green cones) | #1F3C6C | 0.026 |
| Tritanopia (no blue cones) | #004D52 | 0.064 |
| Achromatopsia (no color) | #404040 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00436D
#00436D
oklch(37% 0.093 244.9)
- #5D3500
#5D3500
oklch(37% 0.083 65.3)
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 #00436D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.052
- Charcoal #264653 ΔE 0.054
- Light Navy #155084 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.056
- Midnight Green #073B4C ΔE 0.059
Use #00436D 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.