#10437B
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.109 254.3), rgb(16, 67, 123).
Aa
White text reads best on this color (9.94:1).
About this color
#10437B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.109 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.004 away. White text reads best on it, at 9.94:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.94:1 |
Values
| HEX | #10437B |
| RGB | rgb(16, 67, 123) |
| HSL | hsl(211, 77%, 27%) |
| OKLCH | oklch(38.3% 0.109 254.3) |
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 #10437B | 9.94:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #10437B | 2.11:1 | Fails | Lc 11.3 | Not readable |
| #10437B text on white | 9.94:1 | AAA | Lc 92.7 | Preferred for body text |
| #10437B text on black | 2.11:1 | Fails | Lc -9.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF7
oklch(88.4% 0.045 254.5)
-
Step 300
300
#9DC4F5
oklch(81% 0.081 254.4)
-
Step 400
400
#65A3F0
oklch(70.7% 0.131 254.6)
-
Step 500
500
#358AEB
oklch(63.1% 0.167 254.3)
-
Step 600
600
#0072D8
oklch(55.7% 0.178 254.2)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900 (this color)
#10437B
oklch(38.3% 0.109 254.3)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#10437B 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) | #26487D | 0.025 |
| Deuteranopia (no green cones) | #103E7A | 0.015 |
| Tritanopia (no blue cones) | #005059 | 0.080 |
| Achromatopsia (no color) | #434343 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10437B
#10437B
oklch(38.3% 0.109 254.3)
- #5C3B00
#5C3B00
oklch(38.2% 0.081 73.9)
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 #10437B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.004
- Cobalt #1E488F ΔE 0.038
- Light Navy #155084 ΔE 0.041
- Marine Blue #01386A ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.069
Use #10437B 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.