#0A3889
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.144 261.1), rgb(10, 56, 137).
Aa
White text reads best on this color (10.82:1).
About this color
#0A3889 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.144 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.82:1 |
Values
| HEX | #0A3889 |
| RGB | rgb(10, 56, 137) |
| HSL | hsl(218, 86%, 29%) |
| OKLCH | oklch(36.8% 0.144 261.1) |
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 #0A3889 | 10.82:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #0A3889 | 1.93:1 | Fails | Lc 9.5 | Not readable |
| #0A3889 text on white | 10.82:1 | AAA | Lc 94.4 | Preferred for body text |
| #0A3889 text on black | 1.93:1 | Fails | Lc -8.2 | 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
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3E82FF
oklch(63% 0.199 261.3)
-
Step 600
600
#0363FC
oklch(55.5% 0.24 261.2)
-
Step 700
700
#0053D7
oklch(49.2% 0.214 261.1)
-
Step 800
800
#0143B1
oklch(42.6% 0.185 261.2)
-
Step 900
900 (this color)
#0A3889
oklch(36.8% 0.144 261.1)
-
Step 950
950
#0A2352
oklch(26.9% 0.092 261.5)
#0A3889 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) | #00438C | 0.029 |
| Deuteranopia (no green cones) | #003887 | 0.006 |
| Tritanopia (no blue cones) | #004D5A | 0.111 |
| Achromatopsia (no color) | #3D3D3D | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3889
#0A3889
oklch(36.8% 0.144 261.1)
- #533A00
#533A00
oklch(36.7% 0.076 81.4)
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 #0A3889, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.049
- Marine Blue #01386A ΔE 0.054
- Sapphire #2138AB ΔE 0.060
- Royal #0C1793 ΔE 0.068
- Light Navy #155084 ΔE 0.072
- Marine #042E60 ΔE 0.076
- Dark Slate Blue #483D8B ΔE 0.077
Use #0A3889 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.