#173539
Closest named color: Gunmetal (#293241). oklch(30.8% 0.036 206.8), rgb(23, 53, 57).
Aa
White text reads best on this color (13.08:1).
About this color
#173539 is a dark, muted teal or cyan. In OKLCH its lightness is 31%, its chroma 0.036 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.031 away. White text reads best on it, at 13.08:1.
| Hue family | Teals and cyans |
| Lightness | dark (31%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.60:1 |
| White text | 13.08:1 |
Values
| HEX | #173539 |
| RGB | rgb(23, 53, 57) |
| HSL | hsl(187, 43%, 16%) |
| OKLCH | oklch(30.8% 0.036 206.8) |
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 #173539 | 13.08:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #173539 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #173539 text on white | 13.08:1 | AAA | Lc 99.3 | Preferred for body text |
| #173539 text on black | 1.60:1 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C8DEE1
oklch(88.5% 0.024 206.6)
-
Step 300
300
#A1C9CF
oklch(80.9% 0.043 207.6)
-
Step 400
400
#6BADB6
oklch(70.7% 0.068 206.8)
-
Step 500
500
#3B98A4
oklch(63% 0.088 207)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#114A51
oklch(37.7% 0.057 207.1)
-
Step 950
950 (this color)
#173539
oklch(30.8% 0.036 206.8)
#173539 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) | #313339 | 0.036 |
| Deuteranopia (no green cones) | #2B2F39 | 0.032 |
| Tritanopia (no blue cones) | #023736 | 0.018 |
| Achromatopsia (no color) | #313131 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173539
#173539
oklch(30.8% 0.036 206.8)
- #402926
#402926
oklch(30.8% 0.035 27.5)
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 #173539, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.031
- Midnight Green #073B4C ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.044
- Onyx #343A40 ΔE 0.047
- Oxford Blue #1B263B ΔE 0.054
- Jet #212529 ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.056
Use #173539 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.