#173F50
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.7% 0.053 229.1), rgb(23, 63, 80).
Aa
White text reads best on this color (11.27:1).
About this color
#173F50 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.053 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.014 away. White text reads best on it, at 11.27:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #173F50 |
| RGB | rgb(23, 63, 80) |
| HSL | hsl(198, 55%, 20%) |
| OKLCH | oklch(34.7% 0.053 229.1) |
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 #173F50 | 11.27:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #173F50 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #173F50 text on white | 11.27:1 | AAA | Lc 95.8 | Preferred for body text |
| #173F50 text on black | 1.86:1 | 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
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D6
oklch(80.9% 0.04 230.3)
-
Step 400
400
#76A9C1
oklch(70.8% 0.064 228.9)
-
Step 500
500
#5093B1
oklch(63.1% 0.082 229.1)
-
Step 600
600
#307D9D
oklch(55.6% 0.089 229.1)
-
Step 700
700
#226986
oklch(49.1% 0.083 229.4)
-
Step 800
800
#1F566D
oklch(42.8% 0.068 229.2)
-
Step 900
900 (this color)
#173F50
oklch(34.7% 0.053 229.1)
-
Step 950
950
#132A34
oklch(27.1% 0.034 228.3)
#173F50 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) | #363E51 | 0.038 |
| Deuteranopia (no green cones) | #2E3850 | 0.033 |
| Tritanopia (no blue cones) | #004445 | 0.033 |
| Achromatopsia (no color) | #3B3B3B | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173F50
#173F50
oklch(34.7% 0.053 229.1)
- #503120
#503120
oklch(34.7% 0.053 49.1)
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 #173F50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.014
- Midnight Green #073B4C ΔE 0.019
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.035
- Prussian Blue #1D3557 ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Gunmetal #293241 ΔE 0.045
- Dark Teal #014D4E ΔE 0.049
Use #173F50 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.