#0A4978
Closest named color: Twilight Blue (#0A437A). oklch(39.5% 0.099 247.5), rgb(10, 73, 120).
Aa
White text reads best on this color (9.38:1).
About this color
#0A4978 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.099 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.019 away. White text reads best on it, at 9.38:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.23:1 |
| White text | 9.38:1 |
Values
| HEX | #0A4978 |
| RGB | rgb(10, 73, 120) |
| HSL | hsl(206, 85%, 25%) |
| OKLCH | oklch(39.5% 0.099 247.5) |
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 #0A4978 | 9.38:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #0A4978 | 2.23:1 | Fails | Lc 12.7 | Not readable |
| #0A4978 text on white | 9.38:1 | AAA | Lc 91.2 | Preferred for body text |
| #0A4978 text on black | 2.23:1 | Fails | Lc -11.1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9BC6EF
oklch(81% 0.074 247.5)
-
Step 400
400
#60A7E7
oklch(70.8% 0.118 247.5)
-
Step 500
500
#278FDF
oklch(63.2% 0.151 247.2)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900 (this color)
#0A4978
oklch(39.5% 0.099 247.5)
-
Step 950
950
#072843
oklch(26.9% 0.063 247.7)
#0A4978 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) | #324C7A | 0.036 |
| Deuteranopia (no green cones) | #224277 | 0.024 |
| Tritanopia (no blue cones) | #00545A | 0.070 |
| Achromatopsia (no color) | #464646 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4978
#0A4978
oklch(39.5% 0.099 247.5)
- #643C00
#643C00
oklch(39.5% 0.086 68.4)
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 #0A4978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.019
- Light Navy #155084 ΔE 0.029
- Deep Sea Blue #015482 ΔE 0.035
- Cobalt #1E488F ΔE 0.042
- Dusk Blue #26538D ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
- Marine Blue #01386A ΔE 0.056
- Charcoal #264653 ΔE 0.063
Use #0A4978 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.