#183F47
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.3% 0.046 213.2), rgb(24, 63, 71).
Aa
White text reads best on this color (11.40:1).
About this color
#183F47 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.046 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.021 away. White text reads best on it, at 11.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #183F47 |
| RGB | rgb(24, 63, 71) |
| HSL | hsl(190, 49%, 19%) |
| OKLCH | oklch(34.3% 0.046 213.2) |
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 #183F47 | 11.40:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #183F47 | 1.84:1 | Fails | Lc 7.8 | Not readable |
| #183F47 text on white | 11.40:1 | AAA | Lc 96.1 | Preferred for body text |
| #183F47 text on black | 1.84:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDDE1
oklch(88.6% 0.019 213.4)
-
Step 300
300
#A8C7CE
oklch(80.9% 0.035 212.9)
-
Step 400
400
#79AAB5
oklch(70.7% 0.054 213.1)
-
Step 500
500
#5395A3
oklch(63.1% 0.07 212.9)
-
Step 600
600
#357F8E
oklch(55.6% 0.076 213.1)
-
Step 700
700
#266B79
oklch(49.1% 0.071 213.6)
-
Step 800
800
#225762
oklch(42.6% 0.058 213.5)
-
Step 900
900 (this color)
#183F47
oklch(34.3% 0.046 213.2)
-
Step 950
950
#152A2F
oklch(27% 0.028 214.7)
#183F47 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) | #393D47 | 0.042 |
| Deuteranopia (no green cones) | #323847 | 0.037 |
| Tritanopia (no blue cones) | #004241 | 0.022 |
| Achromatopsia (no color) | #3A3A3A | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183F47
#183F47
oklch(34.3% 0.046 213.2)
- #4E3029
#4E3029
oklch(34.4% 0.046 33.8)
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 #183F47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.021
- Midnight Green #073B4C ΔE 0.022
- Charcoal #264653 ΔE 0.033
- Onyx #343A40 ΔE 0.036
- Gunmetal #293241 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.044
- Dark Teal #014D4E ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.048
Use #183F47 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.