#178F53
Closest named color: Sea Green (#2E8B57). oklch(57.4% 0.136 154.8), rgb(23, 143, 83).
Aa
Black text reads best on this color (5.09:1).
About this color
#178F53 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.136 and its hue 155°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.018 away. Black text reads best on it, at 5.09:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.136) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.09:1 |
| White text | 4.12:1 |
Values
| HEX | #178F53 |
| RGB | rgb(23, 143, 83) |
| HSL | hsl(150, 72%, 33%) |
| OKLCH | oklch(57.4% 0.136 154.8) |
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 #178F53 | 4.12:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #178F53 | 5.09:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #178F53 text on white | 4.12:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #178F53 text on black | 5.09:1 | AA | Lc -33.8 | 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
#E1EEE5
oklch(93.7% 0.018 155.8)
-
Step 200
200
#C9E0CF
oklch(88.5% 0.034 153.6)
-
Step 300
300
#A2CDAF
oklch(80.9% 0.062 154.4)
-
Step 400
400
#6DB386
oklch(70.8% 0.097 154.9)
-
Step 500
500
#3E9F67
oklch(63% 0.125 154.9)
-
Step 600
600 (this color)
#178F53
oklch(57.4% 0.136 154.8)
-
Step 700
700
#007440
oklch(49.1% 0.122 154.8)
-
Step 800
800
#045F34
oklch(42.7% 0.104 154.7)
-
Step 900
900
#134E2E
oklch(37.7% 0.081 155.1)
-
Step 950
950
#0E2E1B
oklch(27.1% 0.052 154.7)
#178F53 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) | #8F834F | 0.120 |
| Deuteranopia (no green cones) | #817957 | 0.117 |
| Tritanopia (no blue cones) | #008D80 | 0.067 |
| Achromatopsia (no color) | #7D7D7D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F53
#178F53
oklch(57.4% 0.136 154.8)
- #A85698
#A85698
oklch(57.4% 0.136 335)
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 #178F53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.018
- Viridian #1E9167 ΔE 0.027
- Light Forest Green #4F9153 ΔE 0.037
- Kelley Green #009337 ΔE 0.039
- Fern Green #548D44 ΔE 0.040
- Jungle Green #048243 ΔE 0.042
- Forest Green #228B22 ΔE 0.048
- Irish Green #019529 ΔE 0.054
Use #178F53 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.