#1A307B
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.131 266.7), rgb(26, 48, 123).
Aa
White text reads best on this color (11.98:1).
About this color
#1A307B is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.131 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.041 away. White text reads best on it, at 11.98:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.98:1 |
Values
| HEX | #1A307B |
| RGB | rgb(26, 48, 123) |
| HSL | hsl(226, 65%, 29%) |
| OKLCH | oklch(34.3% 0.131 266.7) |
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 #1A307B | 11.98:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #1A307B | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #1A307B text on white | 11.98:1 | AAA | Lc 96.9 | Preferred for body text |
| #1A307B text on black | 1.75:1 | Fails | Lc 0.0 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#537EFF
oklch(63.1% 0.197 266.8)
-
Step 600
600
#3A62F0
oklch(55.5% 0.218 266.9)
-
Step 700
700
#2D50D1
oklch(49.1% 0.202 266.7)
-
Step 800
800
#2643A9
oklch(42.8% 0.167 266.8)
-
Step 900
900 (this color)
#1A307B
oklch(34.3% 0.131 266.7)
-
Step 950
950
#14234E
oklch(27.1% 0.082 266.5)
#1A307B 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) | #003B7E | 0.031 |
| Deuteranopia (no green cones) | #00327A | 0.018 |
| Tritanopia (no blue cones) | #004350 | 0.103 |
| Achromatopsia (no color) | #373737 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A307B
#1A307B
oklch(34.3% 0.131 266.7)
- #483600
#483600
oklch(34.3% 0.07 87.9)
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 #1A307B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.041
- Marine #042E60 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.053
- Midnight Blue #191970 ΔE 0.058
- Royal #0C1793 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
- Cobalt #1E488F ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.084
Use #1A307B 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.