#173C4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.9% 0.054 233.9), rgb(23, 60, 79).
Aa
White text reads best on this color (11.69:1).
About this color
#173C4F is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.054 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.008 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #173C4F |
| RGB | rgb(23, 60, 79) |
| HSL | hsl(200, 55%, 20%) |
| OKLCH | oklch(33.9% 0.054 233.9) |
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 #173C4F | 11.69:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #173C4F | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #173C4F text on white | 11.69:1 | AAA | Lc 96.7 | Preferred for body text |
| #173C4F text on black | 1.79:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A8C6D7
oklch(81% 0.04 232.8)
-
Step 400
400
#78A8C3
oklch(70.7% 0.065 233.5)
-
Step 500
500
#5492B4
oklch(63.2% 0.082 234.1)
-
Step 600
600
#357CA0
oklch(55.7% 0.09 233.8)
-
Step 700
700
#276888
oklch(49.1% 0.083 233.5)
-
Step 800
800
#22556F
oklch(42.7% 0.069 233.9)
-
Step 900
900 (this color)
#173C4F
oklch(33.9% 0.054 233.9)
-
Step 950
950
#152935
oklch(27% 0.034 236.3)
#173C4F 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) | #333B50 | 0.035 |
| Deuteranopia (no green cones) | #2B364F | 0.029 |
| Tritanopia (no blue cones) | #004142 | 0.036 |
| Achromatopsia (no color) | #383838 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173C4F
#173C4F
oklch(33.9% 0.054 233.9)
- #4D301C
#4D301C
oklch(33.9% 0.053 54.5)
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 #173C4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.008
- Midnight Green #073B4C ΔE 0.013
- Prussian Blue #1D3557 ΔE 0.030
- Gunmetal #293241 ΔE 0.038
- Charcoal #264653 ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.051
Use #173C4F 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.