#173B3A
Closest named color: Midnight Green (#073B4C). oklch(32.6% 0.041 192.9), rgb(23, 59, 58).
Aa
White text reads best on this color (12.18:1).
About this color
#173B3A is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.041 and its hue 193°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.033 away. White text reads best on it, at 12.18:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.72:1 |
| White text | 12.18:1 |
Values
| HEX | #173B3A |
| RGB | rgb(23, 59, 58) |
| HSL | hsl(178, 44%, 16%) |
| OKLCH | oklch(32.6% 0.041 192.9) |
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 #173B3A | 12.18:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #173B3A | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #173B3A text on white | 12.18:1 | AAA | Lc 97.7 | Preferred for body text |
| #173B3A text on black | 1.72:1 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CDDDDC
oklch(88.5% 0.017 192.3)
-
Step 300
300
#ABC7C6
oklch(80.9% 0.03 193.9)
-
Step 400
400
#7DABA9
oklch(70.8% 0.049 192.7)
-
Step 500
500
#599694
oklch(63.1% 0.064 193)
-
Step 600
600
#3C807E
oklch(55.5% 0.069 192.8)
-
Step 700
700
#2E6C6B
oklch(49.1% 0.064 193.8)
-
Step 800
800
#275857
oklch(42.6% 0.053 193.6)
-
Step 900
900 (this color)
#173B3A
oklch(32.6% 0.041 192.9)
-
Step 950
950
#162B2A
oklch(27.1% 0.027 191.8)
#173B3A 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) | #37383A | 0.043 |
| Deuteranopia (no green cones) | #31343A | 0.039 |
| Tritanopia (no blue cones) | #003D3B | 0.015 |
| Achromatopsia (no color) | #353535 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173B3A
#173B3A
oklch(32.6% 0.041 192.9)
- #472B2E
#472B2E
oklch(32.5% 0.042 12.7)
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 #173B3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.037
- Onyx #343A40 ΔE 0.040
- Gunmetal #293241 ΔE 0.042
- Pakistan Green #283618 ΔE 0.052
- Charcoal #264653 ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.057
- Evergreen #05472A ΔE 0.058
Use #173B3A 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.