#173D39
Closest named color: Midnight Green (#073B4C). oklch(33.1% 0.044 186), rgb(23, 61, 57).
Aa
White text reads best on this color (11.91:1).
About this color
#173D39 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.044 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.038 away. White text reads best on it, at 11.91:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #173D39 |
| RGB | rgb(23, 61, 57) |
| HSL | hsl(174, 45%, 16%) |
| OKLCH | oklch(33.1% 0.044 186) |
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 #173D39 | 11.91:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #173D39 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #173D39 text on white | 11.91:1 | AAA | Lc 97.1 | Preferred for body text |
| #173D39 text on black | 1.76:1 | 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
#CDDDDB
oklch(88.5% 0.017 187.8)
-
Step 300
300
#AAC8C4
oklch(80.9% 0.033 186.7)
-
Step 400
400
#7BACA5
oklch(70.8% 0.053 185.1)
-
Step 500
500
#57978F
oklch(63.1% 0.067 185.4)
-
Step 600
600
#39817A
oklch(55.5% 0.073 186.8)
-
Step 700
700
#2B6D66
oklch(49% 0.068 185.7)
-
Step 800
800
#255954
oklch(42.7% 0.056 186.8)
-
Step 900
900 (this color)
#173D39
oklch(33.1% 0.044 186)
-
Step 950
950
#162B28
oklch(27% 0.028 184.2)
#173D39 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) | #3A3A39 | 0.047 |
| Deuteranopia (no green cones) | #343539 | 0.044 |
| Tritanopia (no blue cones) | #003E3C | 0.014 |
| Achromatopsia (no color) | #373737 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173D39
#173D39
oklch(33.1% 0.044 186)
- #492C32
#492C32
oklch(33.1% 0.044 6.2)
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 #173D39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.041
- Onyx #343A40 ΔE 0.042
- Gunmetal #293241 ΔE 0.049
- Pakistan Green #283618 ΔE 0.050
- Evergreen #05472A ΔE 0.051
- Charcoal #264653 ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.055
Use #173D39 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.