#0A4398
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.15 259.6), rgb(10, 67, 152).
Aa
White text reads best on this color (9.25:1).
About this color
#0A4398 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.150 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 9.25:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #0A4398 |
| RGB | rgb(10, 67, 152) |
| HSL | hsl(216, 88%, 32%) |
| OKLCH | oklch(40.5% 0.15 259.6) |
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 #0A4398 | 9.25:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #0A4398 | 2.26:1 | Fails | Lc 13.3 | Not readable |
| #0A4398 text on white | 9.25:1 | AAA | Lc 90.7 | Preferred for body text |
| #0A4398 text on black | 2.26:1 | Fails | Lc -11.6 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#6AA0F7
oklch(70.6% 0.14 259.6)
-
Step 500
500
#4186F4
oklch(63.2% 0.179 259.4)
-
Step 600
600
#1F6CE3
oklch(55.6% 0.196 259.6)
-
Step 700
700
#1159C5
oklch(49.1% 0.182 259.6)
-
Step 800
800 (this color)
#0A4398
oklch(40.5% 0.15 259.6)
-
Step 900
900
#173F7E
oklch(37.8% 0.116 259.4)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#0A4398 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) | #004E9B | 0.029 |
| Deuteranopia (no green cones) | #004196 | 0.008 |
| Tritanopia (no blue cones) | #005866 | 0.114 |
| Achromatopsia (no color) | #474747 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4398
#0A4398
oklch(40.5% 0.15 259.6)
- #614300
#614300
oklch(40.6% 0.084 79.7)
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 #0A4398, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Sapphire #2138AB ΔE 0.042
- Twilight Blue #0A437A ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.068
Use #0A4398 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.