#0A4170
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.097 250.1), rgb(10, 65, 112).
Aa
White text reads best on this color (10.48:1).
About this color
#0A4170 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.097 and its hue 250°. 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 (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #0A4170 |
| RGB | rgb(10, 65, 112) |
| HSL | hsl(208, 84%, 24%) |
| OKLCH | oklch(36.9% 0.097 250.1) |
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 #0A4170 | 10.48:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #0A4170 | 2.00:1 | Fails | Lc 10.0 | Not readable |
| #0A4170 text on white | 10.48:1 | AAA | Lc 93.9 | Preferred for body text |
| #0A4170 text on black | 2.00:1 | Fails | Lc -8.6 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9DC5EE
oklch(80.9% 0.072 249.4)
-
Step 400
400
#65A5E6
oklch(70.6% 0.116 250.1)
-
Step 500
500
#358DDF
oklch(63.1% 0.149 250.2)
-
Step 600
600
#0076CB
oklch(55.7% 0.158 250)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900 (this color)
#0A4170
oklch(36.9% 0.097 250.1)
-
Step 950
950
#0B2843
oklch(27.1% 0.061 249.8)
#0A4170 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) | #2A4472 | 0.030 |
| Deuteranopia (no green cones) | #193B6F | 0.019 |
| Tritanopia (no blue cones) | #004C53 | 0.069 |
| Achromatopsia (no color) | #3F3F3F | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4170
#0A4170
oklch(36.9% 0.097 250.1)
- #5A3700
#5A3700
oklch(37% 0.08 70.4)
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 #0A4170, 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 0.030
- Dark Grey Blue #29465B ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.051
- Light Navy #155084 ΔE 0.054
- Cobalt #1E488F ΔE 0.058
- Charcoal #264653 ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.060
Use #0A4170 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.