#183961
Closest named color: Prussian Blue (#1D3557). oklch(34.2% 0.08 254.7), rgb(24, 57, 97).
Aa
White text reads best on this color (11.68:1).
About this color
#183961 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.080 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 11.68:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #183961 |
| RGB | rgb(24, 57, 97) |
| HSL | hsl(213, 60%, 24%) |
| OKLCH | oklch(34.2% 0.08 254.7) |
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 #183961 | 11.68:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #183961 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #183961 text on white | 11.68:1 | AAA | Lc 96.6 | Preferred for body text |
| #183961 text on black | 1.79:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#77A3DC
oklch(70.6% 0.097 255.2)
-
Step 500
500
#528BD2
oklch(63% 0.123 254.8)
-
Step 600
600
#3674C0
oklch(55.6% 0.135 255)
-
Step 700
700
#2861A5
oklch(49.1% 0.124 254.8)
-
Step 800
800
#225086
oklch(42.8% 0.103 254.3)
-
Step 900
900 (this color)
#183961
oklch(34.2% 0.08 254.7)
-
Step 950
950
#14273F
oklch(27% 0.052 255)
#183961 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) | #273C63 | 0.021 |
| Deuteranopia (no green cones) | #1C3560 | 0.012 |
| Tritanopia (no blue cones) | #004248 | 0.062 |
| Achromatopsia (no color) | #383838 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183961
#183961
oklch(34.2% 0.08 254.7)
- #4E3200
#4E3200
oklch(34.2% 0.072 74.9)
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 #183961, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine Blue #01386A ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.038
- Marine #042E60 ΔE 0.040
- Midnight Green #073B4C ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.051
- Charcoal #264653 ΔE 0.057
Use #183961 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.