#1B3C72
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.101 259.8), rgb(27, 60, 114).
Aa
White text reads best on this color (10.84:1).
About this color
#1B3C72 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.101 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.84:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #1B3C72 |
| RGB | rgb(27, 60, 114) |
| HSL | hsl(217, 62%, 28%) |
| OKLCH | oklch(36.3% 0.101 259.8) |
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 #1B3C72 | 10.84:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #1B3C72 | 1.93:1 | Fails | Lc 9.1 | Not readable |
| #1B3C72 text on white | 10.84:1 | AAA | Lc 94.8 | Preferred for body text |
| #1B3C72 text on black | 1.93:1 | Fails | Lc -7.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EAF9
oklch(93.5% 0.023 260.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#73A1EC
oklch(70.7% 0.121 259.8)
-
Step 500
500
#4E87E6
oklch(63.1% 0.156 260)
-
Step 600
600
#316FD4
oklch(55.6% 0.168 259.8)
-
Step 700
700
#245CB7
oklch(49.1% 0.156 259.8)
-
Step 800
800
#1F4C94
oklch(42.7% 0.129 259.5)
-
Step 900
900 (this color)
#1B3C72
oklch(36.3% 0.101 259.8)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#1B3C72 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) | #204174 | 0.017 |
| Deuteranopia (no green cones) | #0E3971 | 0.015 |
| Tritanopia (no blue cones) | #004951 | 0.080 |
| Achromatopsia (no color) | #3D3D3D | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3C72
#1B3C72
oklch(36.3% 0.101 259.8)
- #523800
#523800
oklch(36.1% 0.075 79.6)
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 #1B3C72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.049
- Marine #042E60 ΔE 0.056
- Cobalt #1E488F ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.065
Use #1B3C72 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.