#178D5A
Closest named color: Sea Green (#2E8B57). oklch(57% 0.126 158.2), rgb(23, 141, 90).
Aa
Black text reads best on this color (4.99:1).
About this color
#178D5A is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.126 and its hue 158°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.010 away. Black text reads best on it, at 4.99:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.126) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #178D5A |
| RGB | rgb(23, 141, 90) |
| HSL | hsl(154, 72%, 32%) |
| OKLCH | oklch(57% 0.126 158.2) |
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 #178D5A | 4.20:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #178D5A | 4.99:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #178D5A text on white | 4.20:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #178D5A text on black | 4.99:1 | AA | Lc -33.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F7F3
oklch(97.1% 0.008 157.1)
-
Step 100
100
#E1EDE6
oklch(93.5% 0.016 160.6)
-
Step 200
200
#C9E0D1
oklch(88.5% 0.032 157.1)
-
Step 300
300
#A2CCB3
oklch(80.8% 0.057 158.7)
-
Step 400
400
#6DB28B
oklch(70.7% 0.091 158.2)
-
Step 500
500
#3F9E6E
oklch(63% 0.116 158.3)
-
Step 600
600 (this color)
#178D5A
oklch(57% 0.126 158.2)
-
Step 700
700
#007447
oklch(49.2% 0.115 158)
-
Step 800
800
#065E3A
oklch(42.6% 0.096 158.4)
-
Step 900
900
#144D32
oklch(37.6% 0.075 158.6)
-
Step 950
950
#0E2D1D
oklch(26.8% 0.048 158.2)
#178D5A 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) | #8C8157 | 0.117 |
| Deuteranopia (no green cones) | #7E785D | 0.113 |
| Tritanopia (no blue cones) | #008C80 | 0.057 |
| Achromatopsia (no color) | #7B7B7B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178D5A
#178D5A
oklch(57% 0.126 158.2)
- #A65791
#A65791
oklch(57% 0.127 338.1)
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 #178D5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.010
- Viridian #1E9167 ΔE 0.020
- Light Forest Green #4F9153 ΔE 0.040
- Jungle Green #048243 ΔE 0.041
- Fern Green #548D44 ΔE 0.044
- Dark Sage #598556 ΔE 0.049
- Kelley Green #009337 ΔE 0.052
- Ocean Green #3D9973 ΔE 0.053
Use #178D5A 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.