#10437E
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.113 255.3), rgb(16, 67, 126).
Aa
White text reads best on this color (9.87:1).
About this color
#10437E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 255°. 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 9.87:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.87:1 |
Values
| HEX | #10437E |
| RGB | rgb(16, 67, 126) |
| HSL | hsl(212, 77%, 28%) |
| OKLCH | oklch(38.5% 0.113 255.3) |
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 #10437E | 9.87:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #10437E | 2.12:1 | Fails | Lc 11.5 | Not readable |
| #10437E text on white | 9.87:1 | AAA | Lc 92.5 | Preferred for body text |
| #10437E text on black | 2.12:1 | Fails | Lc -10.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F7
oklch(81% 0.084 254.7)
-
Step 400
400
#64A3F3
oklch(70.8% 0.135 255.1)
-
Step 500
500
#3489EF
oklch(63.1% 0.173 255.3)
-
Step 600
600
#0070DC
oklch(55.6% 0.186 255.4)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900 (this color)
#10437E
oklch(38.5% 0.113 255.3)
-
Step 950
950
#0A2648
oklch(26.9% 0.072 255.3)
#10437E 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) | #234880 | 0.023 |
| Deuteranopia (no green cones) | #093F7D | 0.013 |
| Tritanopia (no blue cones) | #00515A | 0.085 |
| Achromatopsia (no color) | #434343 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10437E
#10437E
oklch(38.5% 0.113 255.3)
- #5C3C00
#5C3C00
oklch(38.4% 0.081 75.2)
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 #10437E, 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 0.034
- Light Navy #155084 ΔE 0.040
- Marine Blue #01386A ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.070
Use #10437E 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.