#0A517D
Closest named color: Deep Sea Blue (#015482). oklch(41.8% 0.097 243.5), rgb(10, 81, 125).
Aa
White text reads best on this color (8.44:1).
About this color
#0A517D is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.097 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.011 away. White text reads best on it, at 8.44:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.48:1 |
| White text | 8.44:1 |
Values
| HEX | #0A517D |
| RGB | rgb(10, 81, 125) |
| HSL | hsl(203, 85%, 26%) |
| OKLCH | oklch(41.8% 0.097 243.5) |
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 #0A517D | 8.44:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #0A517D | 2.48:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #0A517D text on white | 8.44:1 | AAA | Lc 88.6 | Fine for body text |
| #0A517D text on black | 2.48:1 | Fails | Lc -13.5 | 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 800.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C6E3
oklch(81% 0.056 242.7)
-
Step 400
400
#6DA7D5
oklch(70.6% 0.091 243.5)
-
Step 500
500
#4290CA
oklch(63% 0.116 243.7)
-
Step 600
600
#1A7AB7
oklch(55.7% 0.126 243.2)
-
Step 700
700
#07669D
oklch(49.1% 0.117 243.3)
-
Step 800
800 (this color)
#0A517D
oklch(41.8% 0.097 243.5)
-
Step 900
900
#164566
oklch(37.6% 0.076 243.3)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#0A517D 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) | #3C527F | 0.043 |
| Deuteranopia (no green cones) | #2C497C | 0.031 |
| Tritanopia (no blue cones) | #005C61 | 0.067 |
| Achromatopsia (no color) | #4D4D4D | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A517D
#0A517D
oklch(41.8% 0.097 243.5)
- #703F00
#703F00
oklch(41.8% 0.095 63.3)
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 #0A517D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.011
- Light Navy #155084 ΔE 0.014
- Dusk Blue #26538D ΔE 0.034
- Twilight Blue #0A437A ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.043
- Cobalt #1E488F ΔE 0.044
- YInMn Blue #415A77 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.060
Use #0A517D 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.