#0A3687
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.143 261.5), rgb(10, 54, 135).
Aa
White text reads best on this color (11.10:1).
About this color
#0A3687 is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.143 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #0A3687 |
| RGB | rgb(10, 54, 135) |
| HSL | hsl(219, 86%, 28%) |
| OKLCH | oklch(36.1% 0.143 261.5) |
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 #0A3687 | 11.10:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #0A3687 | 1.89:1 | Fails | Lc 8.9 | Not readable |
| #0A3687 text on white | 11.10:1 | AAA | Lc 95.0 | Preferred for body text |
| #0A3687 text on black | 1.89:1 | Fails | Lc -7.6 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFF
oklch(93.7% 0.03 260.7)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699EFF
oklch(70.6% 0.153 261.6)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#0B63FC
oklch(55.6% 0.24 261.5)
-
Step 700
700
#0051DA
oklch(49.1% 0.22 261.5)
-
Step 800
800
#0543B1
oklch(42.6% 0.184 261.5)
-
Step 900
900 (this color)
#0A3687
oklch(36.1% 0.143 261.5)
-
Step 950
950
#0A2352
oklch(26.9% 0.092 261.5)
#0A3687 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) | #00418A | 0.029 |
| Deuteranopia (no green cones) | #003685 | 0.006 |
| Tritanopia (no blue cones) | #004B59 | 0.110 |
| Achromatopsia (no color) | #3C3C3C | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3687
#0A3687
oklch(36.1% 0.143 261.5)
- #513900
#513900
oklch(36.2% 0.075 82.1)
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 #0A3687, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.051
- Cobalt #1E488F ΔE 0.055
- Sapphire #2138AB ΔE 0.064
- Royal #0C1793 ΔE 0.064
- Marine #042E60 ΔE 0.071
- Light Navy #155084 ΔE 0.077
- Midnight Blue #191970 ΔE 0.079
Use #0A3687 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.