#183C49
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.6% 0.047 224.6), rgb(24, 60, 73).
Aa
White text reads best on this color (11.78:1).
About this color
#183C49 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.047 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.012 away. White text reads best on it, at 11.78:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #183C49 |
| RGB | rgb(24, 60, 73) |
| HSL | hsl(196, 51%, 19%) |
| OKLCH | oklch(33.6% 0.047 224.6) |
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 #183C49 | 11.78:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #183C49 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #183C49 text on white | 11.78:1 | AAA | Lc 96.9 | Preferred for body text |
| #183C49 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
#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
#A9C6D2
oklch(80.9% 0.036 224.7)
-
Step 400
400
#7AA9BB
oklch(70.8% 0.057 223.7)
-
Step 500
500
#5693AA
oklch(63.1% 0.072 224.4)
-
Step 600
600
#397D96
oklch(55.6% 0.078 225.1)
-
Step 700
700
#2A6980
oklch(49% 0.073 225.4)
-
Step 800
800
#255668
oklch(42.7% 0.06 225)
-
Step 900
900 (this color)
#183C49
oklch(33.6% 0.047 224.6)
-
Step 950
950
#152A31
oklch(27.1% 0.03 221.5)
#183C49 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) | #353B4A | 0.037 |
| Deuteranopia (no green cones) | #2E3549 | 0.034 |
| Tritanopia (no blue cones) | #004040 | 0.029 |
| Achromatopsia (no color) | #383838 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183C49
#183C49
oklch(33.6% 0.047 224.6)
- #4B2F22
#4B2F22
oklch(33.6% 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 #183C49, 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 0.014
- Gunmetal #293241 ΔE 0.035
- Onyx #343A40 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.039
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.051
Use #183C49 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.