#183D4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.049 227.5), rgb(24, 61, 76).
Aa
White text reads best on this color (11.59:1).
About this color
#183D4C is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.049 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.010 away. White text reads best on it, at 11.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #183D4C |
| RGB | rgb(24, 61, 76) |
| HSL | hsl(197, 52%, 20%) |
| OKLCH | oklch(34% 0.049 227.5) |
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 #183D4C | 11.59:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #183D4C | 1.81:1 | Fails | Lc 7.4 | Not readable |
| #183D4C text on white | 11.59:1 | AAA | Lc 96.5 | Preferred for body text |
| #183D4C text on black | 1.81:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CCDCE4
oklch(88.5% 0.02 229.1)
-
Step 300
300
#A9C6D4
oklch(81% 0.037 228.5)
-
Step 400
400
#79A8BE
oklch(70.6% 0.06 228.6)
-
Step 500
500
#5493AD
oklch(63.1% 0.076 226.7)
-
Step 600
600
#367D99
oklch(55.7% 0.083 227.1)
-
Step 700
700
#286983
oklch(49.1% 0.077 228)
-
Step 800
800
#23566A
oklch(42.8% 0.063 226.9)
-
Step 900
900 (this color)
#183D4C
oklch(34% 0.049 227.5)
-
Step 950
950
#152A32
oklch(27.1% 0.031 224.6)
#183D4C 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) | #353C4D | 0.036 |
| Deuteranopia (no green cones) | #2E364C | 0.033 |
| Tritanopia (no blue cones) | #004142 | 0.030 |
| Achromatopsia (no color) | #393939 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D4C
#183D4C
oklch(34% 0.049 227.5)
- #4D3021
#4D3021
oklch(34% 0.049 47.9)
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 #183D4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.010
- Midnight Green #073B4C ΔE 0.015
- Charcoal #264653 ΔE 0.035
- Prussian Blue #1D3557 ΔE 0.037
- Onyx #343A40 ΔE 0.038
- Gunmetal #293241 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.053
Use #183D4C 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.