#173240
Closest named color: Gunmetal (#293241). oklch(30.3% 0.042 233), rgb(23, 50, 64).
Aa
White text reads best on this color (13.40:1).
About this color
#173240 is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.042 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.024 away. White text reads best on it, at 13.40:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.56:1 |
| White text | 13.40:1 |
Values
| HEX | #173240 |
| RGB | rgb(23, 50, 64) |
| HSL | hsl(200, 47%, 17%) |
| OKLCH | oklch(30.3% 0.042 233) |
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 #173240 | 13.40:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #173240 | 1.56:1 | Fails | Lc 0.0 | Not readable |
| #173240 text on white | 13.40:1 | AAA | Lc 99.7 | Preferred for body text |
| #173240 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DC
oklch(81% 0.049 233.1)
-
Step 400
400
#6DA9CA
oklch(70.6% 0.079 233.5)
-
Step 500
500
#4193BC
oklch(63% 0.1 233.3)
-
Step 600
600
#157DA9
oklch(55.6% 0.11 233.4)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#0A5675
oklch(42.7% 0.084 232.7)
-
Step 900
900
#15475F
oklch(37.7% 0.066 233.5)
-
Step 950
950 (this color)
#173240
oklch(30.3% 0.042 233)
#173240 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) | #2B3141 | 0.027 |
| Deuteranopia (no green cones) | #252D40 | 0.023 |
| Tritanopia (no blue cones) | #003637 | 0.030 |
| Achromatopsia (no color) | #2F2F2F | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173240
#173240
oklch(30.3% 0.042 233)
- #3F281A
#3F281A
oklch(30.1% 0.042 51.9)
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 #173240, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.032
- Midnight Green #073B4C ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.037
- Oxford Blue #1B263B ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.043
- Dark #1B2431 ΔE 0.049
- Onyx #343A40 ΔE 0.051
Use #173240 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.