#1B3967
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.088 258.8), rgb(27, 57, 103).
Aa
White text reads best on this color (11.48:1).
About this color
#1B3967 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.088 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.019 away. White text reads best on it, at 11.48:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.48:1 |
Values
| HEX | #1B3967 |
| RGB | rgb(27, 57, 103) |
| HSL | hsl(216, 58%, 25%) |
| OKLCH | oklch(34.8% 0.088 258.8) |
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 #1B3967 | 11.48:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #1B3967 | 1.82:1 | Fails | Lc 7.7 | Not readable |
| #1B3967 text on white | 11.48:1 | AAA | Lc 96.2 | Preferred for body text |
| #1B3967 text on black | 1.82:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EC
oklch(80.8% 0.067 259.1)
-
Step 400
400
#78A2E2
oklch(70.7% 0.105 258.6)
-
Step 500
500
#5489DA
oklch(63.1% 0.135 258.6)
-
Step 600
600
#3971C8
oklch(55.6% 0.148 259)
-
Step 700
700
#2B5EAD
oklch(49% 0.138 259)
-
Step 800
800
#254D8C
oklch(42.6% 0.114 259.2)
-
Step 900
900 (this color)
#1B3967
oklch(34.8% 0.088 258.8)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#1B3967 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) | #233D69 | 0.016 |
| Deuteranopia (no green cones) | #173666 | 0.011 |
| Tritanopia (no blue cones) | #00444B | 0.070 |
| Achromatopsia (no color) | #393939 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3967
#1B3967
oklch(34.8% 0.088 258.8)
- #4E3400
#4E3400
oklch(34.7% 0.072 77.9)
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 #1B3967, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.019
- Prussian Blue #1D3557 ΔE 0.029
- Twilight Blue #0A437A ΔE 0.040
- Marine #042E60 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.048
- Midnight Green #073B4C ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.054
- Charcoal #264653 ΔE 0.063
Use #1B3967 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.