#183F4D
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.6% 0.05 224.7), rgb(24, 63, 77).
Aa
White text reads best on this color (11.30:1).
About this color
#183F4D is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.050 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.014 away. White text reads best on it, at 11.30:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #183F4D |
| RGB | rgb(24, 63, 77) |
| HSL | hsl(196, 52%, 20%) |
| OKLCH | oklch(34.6% 0.05 224.7) |
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 #183F4D | 11.30:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #183F4D | 1.85:1 | Fails | Lc 8.0 | Not readable |
| #183F4D text on white | 11.30:1 | AAA | Lc 95.9 | Preferred for body text |
| #183F4D text on black | 1.85:1 | 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
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDCE4
oklch(88.4% 0.021 227.6)
-
Step 300
300
#A8C6D3
oklch(80.9% 0.037 225.9)
-
Step 400
400
#78A9BD
oklch(70.7% 0.06 225.3)
-
Step 500
500
#5293AC
oklch(63% 0.076 225.1)
-
Step 600
600
#337D98
oklch(55.5% 0.083 225.5)
-
Step 700
700
#256A82
oklch(49.2% 0.077 225)
-
Step 800
800
#205669
oklch(42.6% 0.064 224.7)
-
Step 900
900 (this color)
#183F4D
oklch(34.6% 0.05 224.7)
-
Step 950
950
#142A32
oklch(27.1% 0.032 223.6)
#183F4D 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) | #373E4E | 0.038 |
| Deuteranopia (no green cones) | #30384D | 0.035 |
| Tritanopia (no blue cones) | #004343 | 0.030 |
| Achromatopsia (no color) | #3A3A3A | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183F4D
#183F4D
oklch(34.6% 0.05 224.7)
- #4F3123
#4F3123
oklch(34.6% 0.05 45.7)
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 #183F4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.014
- Midnight Green #073B4C ΔE 0.019
- Charcoal #264653 ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.037
- Onyx #343A40 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.042
- Gunmetal #293241 ΔE 0.044
- Dark Teal #014D4E ΔE 0.047
Use #183F4D 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.