#173F37
Closest named color: Evergreen (#05472A). oklch(33.6% 0.047 178.1), rgb(23, 63, 55).
Aa
White text reads best on this color (11.64:1).
About this color
#173F37 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.047 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Evergreen (#05472A), ΔE 0.042 away. White text reads best on it, at 11.64:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Evergreen (#05472A) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #173F37 |
| RGB | rgb(23, 63, 55) |
| HSL | hsl(168, 47%, 17%) |
| OKLCH | oklch(33.6% 0.047 178.1) |
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 #173F37 | 11.64:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #173F37 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #173F37 text on white | 11.64:1 | AAA | Lc 96.6 | Preferred for body text |
| #173F37 text on black | 1.80:1 | 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
#CCDED9
oklch(88.6% 0.02 177.4)
-
Step 300
300
#A9C9C0
oklch(81% 0.037 176.5)
-
Step 400
400
#7AADA1
oklch(70.8% 0.057 178.3)
-
Step 500
500
#559889
oklch(63.1% 0.073 177.7)
-
Step 600
600
#378273
oklch(55.5% 0.078 178.1)
-
Step 700
700
#286E61
oklch(49% 0.073 178.7)
-
Step 800
800
#235A4F
oklch(42.7% 0.061 178)
-
Step 900
900 (this color)
#173F37
oklch(33.6% 0.047 178.1)
-
Step 950
950
#152B26
oklch(26.9% 0.03 177.6)
#173F37 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) | #3C3B37 | 0.049 |
| Deuteranopia (no green cones) | #363738 | 0.047 |
| Tritanopia (no blue cones) | #00403D | 0.015 |
| Achromatopsia (no color) | #383838 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173F37
#173F37
oklch(33.6% 0.047 178.1)
- #4B2C37
#4B2C37
oklch(33.6% 0.048 357.2)
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 #173F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Evergreen #05472A ΔE 0.042
- Midnight Green #073B4C ΔE 0.045
- Onyx #343A40 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Pakistan Green #283618 ΔE 0.048
- Dark Teal #014D4E ΔE 0.051
- Charcoal #264653 ΔE 0.054
- Charcoal Grey #3C4142 ΔE 0.054
Use #173F37 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.