#0A2A51
Closest named color: Marine (#042E60). oklch(28.6% 0.08 255.6), rgb(10, 42, 81).
Aa
White text reads best on this color (14.35:1).
About this color
#0A2A51 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.080 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.028 away. White text reads best on it, at 14.35:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.46:1 |
| White text | 14.35:1 |
Values
| HEX | #0A2A51 |
| RGB | rgb(10, 42, 81) |
| HSL | hsl(213, 78%, 18%) |
| OKLCH | oklch(28.6% 0.08 255.6) |
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 #0A2A51 | 14.35:1 | AAA | Lc -103.8 | Preferred for body text |
| Black text on #0A2A51 | 1.46:1 | Fails | Lc 0.0 | Not readable |
| #0A2A51 text on white | 14.35:1 | AAA | Lc 100.8 | Preferred for body text |
| #0A2A51 text on black | 1.46:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#98C4FE
oklch(81% 0.095 255.5)
-
Step 400
400
#5BA2FD
oklch(70.7% 0.152 255.5)
-
Step 500
500
#2287FB
oklch(63.1% 0.194 255.6)
-
Step 600
600
#0070DD
oklch(55.6% 0.187 255.6)
-
Step 700
700
#005EBB
oklch(49.1% 0.165 255.5)
-
Step 800
800
#004C9B
oklch(42.6% 0.144 255.8)
-
Step 900
900
#003F83
oklch(37.6% 0.128 255.9)
-
Step 950
950 (this color)
#0A2A51
oklch(28.6% 0.08 255.6)
#0A2A51 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) | #162D53 | 0.016 |
| Deuteranopia (no green cones) | #082750 | 0.010 |
| Tritanopia (no blue cones) | #003339 | 0.060 |
| Achromatopsia (no color) | #2A2A2A | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A2A51
#0A2A51
oklch(28.6% 0.08 255.6)
- #3B2500
#3B2500
oklch(28.5% 0.06 75.3)
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 #0A2A51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.028
- Oxford Blue #1B263B ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.052
- Marine Blue #01386A ΔE 0.058
- Gunmetal #293241 ΔE 0.058
- Midnight Green #073B4C ΔE 0.060
- Dark #1B2431 ΔE 0.060
Use #0A2A51 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.