#183A77
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.112 261), rgb(24, 58, 119).
Aa
White text reads best on this color (10.99:1).
About this color
#183A77 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.112 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 10.99:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.99:1 |
Values
| HEX | #183A77 |
| RGB | rgb(24, 58, 119) |
| HSL | hsl(219, 66%, 28%) |
| OKLCH | oklch(36.1% 0.112 261) |
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 #183A77 | 10.99:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #183A77 | 1.91:1 | Fails | Lc 8.9 | Not readable |
| #183A77 text on white | 10.99:1 | AAA | Lc 95.1 | Preferred for body text |
| #183A77 text on black | 1.91:1 | Fails | Lc -7.6 | 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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F7
oklch(80.9% 0.083 260.4)
-
Step 400
400
#70A0F4
oklch(70.8% 0.134 261)
-
Step 500
500
#4A85F0
oklch(63.1% 0.172 261.2)
-
Step 600
600
#2C6CDE
oklch(55.6% 0.186 260.9)
-
Step 700
700
#1F59C1
oklch(49% 0.174 261.1)
-
Step 800
800
#1C4A9C
oklch(42.8% 0.143 260.9)
-
Step 900
900 (this color)
#183A77
oklch(36.1% 0.112 261)
-
Step 950
950
#112549
oklch(27% 0.072 261.1)
#183A77 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) | #164179 | 0.020 |
| Deuteranopia (no green cones) | #003876 | 0.017 |
| Tritanopia (no blue cones) | #004952 | 0.089 |
| Achromatopsia (no color) | #3C3C3C | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A77
#183A77
oklch(36.1% 0.112 261)
- #513800
#513800
oklch(36% 0.074 80.6)
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 #183A77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Marine Blue #01386A ΔE 0.029
- Cobalt #1E488F ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.056
- Marine #042E60 ΔE 0.056
- Light Navy #155084 ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.070
- Dark Blue Grey #1F3B4D ΔE 0.075
Use #183A77 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.