#183B49
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.3% 0.047 227), rgb(24, 59, 73).
Aa
White text reads best on this color (11.92:1).
About this color
#183B49 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.047 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.92:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.76:1 |
| White text | 11.92:1 |
Values
| HEX | #183B49 |
| RGB | rgb(24, 59, 73) |
| HSL | hsl(197, 51%, 19%) |
| OKLCH | oklch(33.3% 0.047 227) |
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 #183B49 | 11.92:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #183B49 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #183B49 text on white | 11.92:1 | AAA | Lc 97.2 | Preferred for body text |
| #183B49 text on black | 1.76:1 | 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
#CCDCE3
oklch(88.5% 0.02 225.7)
-
Step 300
300
#AAC6D3
oklch(81% 0.035 227.5)
-
Step 400
400
#7BA8BC
oklch(70.6% 0.056 227.2)
-
Step 500
500
#5793AC
oklch(63.2% 0.073 226.7)
-
Step 600
600
#3A7C97
oklch(55.5% 0.079 227.6)
-
Step 700
700
#2C6981
oklch(49.1% 0.073 227.1)
-
Step 800
800
#265669
oklch(42.8% 0.061 226.8)
-
Step 900
900 (this color)
#183B49
oklch(33.3% 0.047 227)
-
Step 950
950
#162932
oklch(26.9% 0.03 229.7)
#183B49 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) | #343A4A | 0.036 |
| Deuteranopia (no green cones) | #2D3549 | 0.031 |
| Tritanopia (no blue cones) | #003F40 | 0.029 |
| Achromatopsia (no color) | #373737 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B49
#183B49
oklch(33.3% 0.047 227)
- #4A2E21
#4A2E21
oklch(33.2% 0.047 45.6)
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 #183B49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Midnight Green #073B4C ΔE 0.012
- Gunmetal #293241 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.036
- Onyx #343A40 ΔE 0.037
- Charcoal #264653 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.049
Use #183B49 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.