#00436A
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.089 243.1), rgb(0, 67, 106).
Aa
White text reads best on this color (10.44:1).
About this color
#00436A is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.089 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.44:1 |
Values
| HEX | #00436A |
| RGB | rgb(0, 67, 106) |
| HSL | hsl(202, 100%, 21%) |
| OKLCH | oklch(36.8% 0.089 243.1) |
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 #00436A | 10.44:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #00436A | 2.01:1 | Fails | Lc 10.2 | Not readable |
| #00436A text on white | 10.44:1 | AAA | Lc 93.7 | Preferred for body text |
| #00436A text on black | 2.01:1 | Fails | Lc -8.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9CC6E9
oklch(80.9% 0.067 243.9)
-
Step 400
400
#61A8DE
oklch(70.7% 0.107 243.1)
-
Step 500
500
#2A91D5
oklch(63.1% 0.137 243.1)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900 (this color)
#00436A
oklch(36.8% 0.089 243.1)
-
Step 950
950
#082940
oklch(27% 0.057 243.6)
#00436A 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) | #30446C | 0.039 |
| Deuteranopia (no green cones) | #213C69 | 0.027 |
| Tritanopia (no blue cones) | #004D51 | 0.062 |
| Achromatopsia (no color) | #404040 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00436A
#00436A
oklch(36.8% 0.089 243.1)
- #5D3300
#5D3300
oklch(36.6% 0.084 62.8)
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 #00436A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.049
- Charcoal #264653 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.052
- Midnight Green #073B4C ΔE 0.054
- Light Navy #155084 ΔE 0.058
Use #00436A 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.