#183F49
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.4% 0.047 217.3), rgb(24, 63, 73).
Aa
White text reads best on this color (11.37:1).
About this color
#183F49 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.047 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.018 away. White text reads best on it, at 11.37:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #183F49 |
| RGB | rgb(24, 63, 73) |
| HSL | hsl(192, 51%, 19%) |
| OKLCH | oklch(34.4% 0.047 217.3) |
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 #183F49 | 11.37:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #183F49 | 1.84:1 | Fails | Lc 7.8 | Not readable |
| #183F49 text on white | 11.37:1 | AAA | Lc 96.1 | Preferred for body text |
| #183F49 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
#CCDDE2
oklch(88.6% 0.02 217.2)
-
Step 300
300
#A8C7D0
oklch(81% 0.036 217.2)
-
Step 400
400
#78AAB8
oklch(70.8% 0.057 217.1)
-
Step 500
500
#5394A6
oklch(63% 0.072 217.8)
-
Step 600
600
#347E91
oklch(55.5% 0.078 217.5)
-
Step 700
700
#266B7C
oklch(49.2% 0.073 217.2)
-
Step 800
800
#215765
oklch(42.7% 0.061 217.8)
-
Step 900
900 (this color)
#183F49
oklch(34.4% 0.047 217.3)
-
Step 950
950
#142A30
oklch(27% 0.03 217.4)
#183F49 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) | #383D4A | 0.040 |
| Deuteranopia (no green cones) | #313849 | 0.036 |
| Tritanopia (no blue cones) | #004342 | 0.025 |
| Achromatopsia (no color) | #3A3A3A | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183F49
#183F49
oklch(34.4% 0.047 217.3)
- #4E3027
#4E3027
oklch(34.3% 0.047 37.4)
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 #183F49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.018
- Midnight Green #073B4C ΔE 0.021
- Charcoal #264653 ΔE 0.032
- Onyx #343A40 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.042
- Gunmetal #293241 ΔE 0.044
- Dark Teal #014D4E ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.047
Use #183F49 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.