#0A3880
Closest named color: Twilight Blue (#0A437A). oklch(36% 0.131 259.9), rgb(10, 56, 128).
Aa
White text reads best on this color (11.10:1).
About this color
#0A3880 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.131 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.034 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #0A3880 |
| RGB | rgb(10, 56, 128) |
| HSL | hsl(217, 86%, 27%) |
| OKLCH | oklch(36% 0.131 259.9) |
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 #0A3880 | 11.10:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #0A3880 | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #0A3880 text on white | 11.10:1 | AAA | Lc 95.1 | Preferred for body text |
| #0A3880 text on black | 1.89:1 | Fails | Lc -7.6 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DAFE
oklch(88.4% 0.055 260.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3883FF
oklch(63% 0.199 260)
-
Step 600
600
#0B68F0
oklch(55.6% 0.219 260)
-
Step 700
700
#0056CE
oklch(49% 0.199 259.9)
-
Step 800
800
#0447A9
oklch(42.7% 0.169 259.9)
-
Step 900
900 (this color)
#0A3880
oklch(36% 0.131 259.9)
-
Step 950
950
#0B244E
oklch(26.9% 0.084 260.2)
#0A3880 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) | #004183 | 0.025 |
| Deuteranopia (no green cones) | #00377F | 0.007 |
| Tritanopia (no blue cones) | #004A56 | 0.100 |
| Achromatopsia (no color) | #3C3C3C | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3880
#0A3880
oklch(36% 0.131 259.9)
- #513800
#513800
oklch(36% 0.074 80.6)
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 #0A3880, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.034
- Marine Blue #01386A ΔE 0.039
- Cobalt #1E488F ΔE 0.055
- Marine #042E60 ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.071
- Light Navy #155084 ΔE 0.071
- Royal #0C1793 ΔE 0.074
- Sapphire #2138AB ΔE 0.075
Use #0A3880 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.