#173540
Closest named color: Gunmetal (#293241). oklch(31.1% 0.041 224.5), rgb(23, 53, 64).
Aa
White text reads best on this color (12.96:1).
About this color
#173540 is a dark, muted teal or cyan. In OKLCH its lightness is 31%, its chroma 0.041 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.025 away. White text reads best on it, at 12.96:1.
| Hue family | Teals and cyans |
| Lightness | dark (31%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.61:1 |
| White text | 12.96:1 |
Values
| HEX | #173540 |
| RGB | rgb(23, 53, 64) |
| HSL | hsl(196, 47%, 17%) |
| OKLCH | oklch(31.1% 0.041 224.5) |
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 #173540 | 12.96:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #173540 | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #173540 text on white | 12.96:1 | AAA | Lc 99.1 | Preferred for body text |
| #173540 text on black | 1.61:1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C7DDE6
oklch(88.4% 0.027 224.3)
-
Step 300
300
#A0C8D8
oklch(80.9% 0.048 224.2)
-
Step 400
400
#69ABC5
oklch(70.7% 0.077 225.2)
-
Step 500
500
#3896B6
oklch(63.1% 0.099 224.4)
-
Step 600
600
#007FA1
oklch(55.5% 0.105 225)
-
Step 700
700
#006B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#0F495B
oklch(37.8% 0.064 223.7)
-
Step 950
950 (this color)
#173540
oklch(31.1% 0.041 224.5)
#173540 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) | #2F3441 | 0.032 |
| Deuteranopia (no green cones) | #292F40 | 0.029 |
| Tritanopia (no blue cones) | #003839 | 0.025 |
| Achromatopsia (no color) | #313131 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173540
#173540
oklch(31.1% 0.041 224.5)
- #422A1F
#422A1F
oklch(31.1% 0.041 45.4)
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 #173540, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.025
- Midnight Green #073B4C ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.043
- Onyx #343A40 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.050
- Dark #1B2431 ΔE 0.058
Use #173540 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.