#183333
Closest named color: Gunmetal (#293241). oklch(30% 0.033 195.5), rgb(24, 51, 51).
Aa
White text reads best on this color (13.46:1).
About this color
#183333 is a dark, muted teal or cyan. In OKLCH its lightness is 30%, its chroma 0.033 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.037 away. White text reads best on it, at 13.46:1.
| Hue family | Teals and cyans |
| Lightness | dark (30%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.56:1 |
| White text | 13.46:1 |
Values
| HEX | #183333 |
| RGB | rgb(24, 51, 51) |
| HSL | hsl(180, 36%, 15%) |
| OKLCH | oklch(30% 0.033 195.5) |
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 #183333 | 13.46:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #183333 | 1.56:1 | Fails | Lc 0.0 | Not readable |
| #183333 text on white | 13.46:1 | AAA | Lc 99.8 | Preferred for body text |
| #183333 text on black | 1.56:1 | 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 950.
-
Step 50
50
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CADEDE
oklch(88.6% 0.021 196.8)
-
Step 300
300
#A4C9C9
oklch(80.9% 0.039 196.4)
-
Step 400
400
#71ADAD
oklch(70.7% 0.062 195.8)
-
Step 500
500
#469999
oklch(63.2% 0.08 195.3)
-
Step 600
600
#1F8383
oklch(55.6% 0.087 194.9)
-
Step 700
700
#0C6F6F
oklch(49.2% 0.081 194.8)
-
Step 800
800
#125A5B
oklch(42.7% 0.067 196.4)
-
Step 900
900
#194A4A
oklch(37.6% 0.052 195.2)
-
Step 950
950 (this color)
#183333
oklch(30% 0.033 195.5)
#183333 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) | #303133 | 0.034 |
| Deuteranopia (no green cones) | #2B2D33 | 0.032 |
| Tritanopia (no blue cones) | #0A3533 | 0.013 |
| Achromatopsia (no color) | #2F2F2F | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183333
#183333
oklch(30% 0.033 195.5)
- #3D2728
#3D2728
oklch(30% 0.033 16.2)
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 #183333, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.037
- Midnight Green #073B4C ΔE 0.045
- Jet #212529 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Pakistan Green #283618 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.052
- Dark #1B2431 ΔE 0.053
Use #183333 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.