#183D49
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.9% 0.047 222.1), rgb(24, 61, 73).
Aa
White text reads best on this color (11.65:1).
About this color
#183D49 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.047 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.013 away. White text reads best on it, at 11.65:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.80:1 |
| White text | 11.65:1 |
Values
| HEX | #183D49 |
| RGB | rgb(24, 61, 73) |
| HSL | hsl(195, 51%, 19%) |
| OKLCH | oklch(33.9% 0.047 222.1) |
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 #183D49 | 11.65:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #183D49 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #183D49 text on white | 11.65:1 | AAA | Lc 96.6 | Preferred for body text |
| #183D49 text on black | 1.80:1 | 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
#CCDCE2
oklch(88.4% 0.019 222.2)
-
Step 300
300
#A9C6D1
oklch(80.9% 0.035 222.7)
-
Step 400
400
#7AA9BA
oklch(70.7% 0.056 222.3)
-
Step 500
500
#5593A9
oklch(63% 0.072 223)
-
Step 600
600
#377D94
oklch(55.5% 0.078 222.6)
-
Step 700
700
#296A7E
oklch(49.2% 0.072 221.6)
-
Step 800
800
#245667
oklch(42.7% 0.06 223.3)
-
Step 900
900 (this color)
#183D49
oklch(33.9% 0.047 222.1)
-
Step 950
950
#152A31
oklch(27.1% 0.03 221.5)
#183D49 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) | #363B4A | 0.038 |
| Deuteranopia (no green cones) | #2F3649 | 0.034 |
| Tritanopia (no blue cones) | #004141 | 0.027 |
| Achromatopsia (no color) | #383838 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D49
#183D49
oklch(33.9% 0.047 222.1)
- #4C2F24
#4C2F24
oklch(33.8% 0.047 41.5)
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 #183D49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.013
- Midnight Green #073B4C ΔE 0.016
- Onyx #343A40 ΔE 0.036
- Charcoal #264653 ΔE 0.037
- Gunmetal #293241 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.051
Use #183D49 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.