#183B53
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.9% 0.058 241.4), rgb(24, 59, 83).
Aa
White text reads best on this color (11.73:1).
About this color
#183B53 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.058 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.012 away. White text reads best on it, at 11.73:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.73:1 |
Values
| HEX | #183B53 |
| RGB | rgb(24, 59, 83) |
| HSL | hsl(204, 55%, 21%) |
| OKLCH | oklch(33.9% 0.058 241.4) |
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 #183B53 | 11.73:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #183B53 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #183B53 text on white | 11.73:1 | AAA | Lc 96.8 | Preferred for body text |
| #183B53 text on black | 1.78:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDCE8
oklch(88.6% 0.024 240.1)
-
Step 300
300
#A8C5DB
oklch(80.9% 0.044 240.9)
-
Step 400
400
#79A7C9
oklch(70.8% 0.07 241)
-
Step 500
500
#5590BB
oklch(63.1% 0.09 241.7)
-
Step 600
600
#377AA7
oklch(55.6% 0.097 241)
-
Step 700
700
#29668F
oklch(49% 0.091 241.5)
-
Step 800
800
#245474
oklch(42.8% 0.074 240.8)
-
Step 900
900 (this color)
#183B53
oklch(33.9% 0.058 241.4)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#183B53 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) | #303B54 | 0.029 |
| Deuteranopia (no green cones) | #283553 | 0.025 |
| Tritanopia (no blue cones) | #004143 | 0.043 |
| Achromatopsia (no color) | #383838 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B53
#183B53
oklch(33.9% 0.058 241.4)
- #4D3015
#4D3015
oklch(33.8% 0.058 61.6)
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 #183B53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.012
- Midnight Green #073B4C ΔE 0.018
- Prussian Blue #1D3557 ΔE 0.023
- Gunmetal #293241 ΔE 0.039
- Charcoal #264653 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Marine Blue #01386A ΔE 0.046
- Onyx #343A40 ΔE 0.046
Use #183B53 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.