#173D37
Closest named color: Midnight Green (#073B4C). oklch(33% 0.045 181.6), rgb(23, 61, 55).
Aa
White text reads best on this color (11.93:1).
About this color
#173D37 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.045 and its hue 182°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.041 away. White text reads best on it, at 11.93:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.75:1 |
| White text | 11.93:1 |
Values
| HEX | #173D37 |
| RGB | rgb(23, 61, 55) |
| HSL | hsl(171, 45%, 16%) |
| OKLCH | oklch(33% 0.045 181.6) |
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 #173D37 | 11.93:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #173D37 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #173D37 text on white | 11.93:1 | AAA | Lc 97.2 | Preferred for body text |
| #173D37 text on black | 1.75:1 | 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
#F2F6F5
oklch(97% 0.004 179.7)
-
Step 100
100
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CDDDDA
oklch(88.5% 0.018 183.5)
-
Step 300
300
#AAC8C2
oklch(80.9% 0.033 182)
-
Step 400
400
#7BACA3
oklch(70.7% 0.054 182.1)
-
Step 500
500
#57978C
oklch(63% 0.068 181.8)
-
Step 600
600
#3A8276
oklch(55.7% 0.075 181)
-
Step 700
700
#2B6E63
oklch(49.2% 0.07 180.8)
-
Step 800
800
#255951
oklch(42.6% 0.057 182)
-
Step 900
900 (this color)
#173D37
oklch(33% 0.045 181.6)
-
Step 950
950
#162B27
oklch(27% 0.028 180.5)
#173D37 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) | #3A3937 | 0.047 |
| Deuteranopia (no green cones) | #343538 | 0.045 |
| Tritanopia (no blue cones) | #013E3B | 0.014 |
| Achromatopsia (no color) | #373737 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173D37
#173D37
oklch(33% 0.045 181.6)
- #492C34
#492C34
oklch(33.2% 0.044 1.9)
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 #173D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.041
- Onyx #343A40 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.044
- Pakistan Green #283618 ΔE 0.047
- Evergreen #05472A ΔE 0.048
- Gunmetal #293241 ΔE 0.051
- Charcoal #264653 ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.056
Use #173D37 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.