#0A3E7E
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.12 256.8), rgb(10, 62, 126).
Aa
White text reads best on this color (10.48:1).
About this color
#0A3E7E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 10.48:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #0A3E7E |
| RGB | rgb(10, 62, 126) |
| HSL | hsl(213, 85%, 27%) |
| OKLCH | oklch(37.2% 0.12 256.8) |
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 #0A3E7E | 10.48:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #0A3E7E | 2.00:1 | Fails | Lc 10.1 | Not readable |
| #0A3E7E text on white | 10.48:1 | AAA | Lc 93.8 | Preferred for body text |
| #0A3E7E text on black | 2.00:1 | Fails | Lc -8.7 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFB
oklch(88.5% 0.051 256.7)
-
Step 300
300
#9BC3FB
oklch(80.9% 0.091 256.9)
-
Step 400
400
#62A2F9
oklch(70.8% 0.144 256.5)
-
Step 500
500
#3287F6
oklch(63.1% 0.185 256.8)
-
Step 600
600
#006EE2
oklch(55.6% 0.196 256.8)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900 (this color)
#0A3E7E
oklch(37.2% 0.12 256.8)
-
Step 950
950
#0A264B
oklch(27.1% 0.076 256.8)
#0A3E7E 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) | #174580 | 0.023 |
| Deuteranopia (no green cones) | #003B7D | 0.011 |
| Tritanopia (no blue cones) | #004E58 | 0.091 |
| Achromatopsia (no color) | #3F3F3F | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3E7E
#0A3E7E
oklch(37.2% 0.12 256.8)
- #573A00
#573A00
oklch(37.3% 0.078 77.3)
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 #0A3E7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Marine Blue #01386A ΔE 0.038
- Cobalt #1E488F ΔE 0.043
- Light Navy #155084 ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.065
- Marine #042E60 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.069
- Dusk Blue #26538D ΔE 0.071
Use #0A3E7E 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.