#178C54
Closest named color: Sea Green (#2E8B57). oklch(56.6% 0.131 155.9), rgb(23, 140, 84).
Aa
Black text reads best on this color (4.91:1).
About this color
#178C54 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.131 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.012 away. Black text reads best on it, at 4.91:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #178C54 |
| RGB | rgb(23, 140, 84) |
| HSL | hsl(151, 72%, 32%) |
| OKLCH | oklch(56.6% 0.131 155.9) |
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 #178C54 | 4.27:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #178C54 | 4.91:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #178C54 text on white | 4.27:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #178C54 text on black | 4.91:1 | AA | Lc -32.6 | 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
#E1EDE5
oklch(93.5% 0.017 156.9)
-
Step 200
200
#C9E0D0
oklch(88.5% 0.033 155.3)
-
Step 300
300
#A3CCB1
oklch(80.8% 0.058 156)
-
Step 400
400
#6EB288
oklch(70.6% 0.093 156)
-
Step 500
500
#409F6A
oklch(63.2% 0.121 155.9)
-
Step 600
600 (this color)
#178C54
oklch(56.6% 0.131 155.9)
-
Step 700
700
#007442
oklch(49.1% 0.12 155.6)
-
Step 800
800
#085F36
oklch(42.8% 0.101 155.5)
-
Step 900
900
#154E2F
oklch(37.8% 0.079 155.4)
-
Step 950
950
#0F2E1C
oklch(27.2% 0.05 155.4)
#178C54 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) | #8B8050 | 0.117 |
| Deuteranopia (no green cones) | #7E7758 | 0.114 |
| Tritanopia (no blue cones) | #008B7E | 0.062 |
| Achromatopsia (no color) | #7A7A7A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178C54
#178C54
oklch(56.6% 0.131 155.9)
- #A45593
#A45593
oklch(56.5% 0.13 335.8)
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 #178C54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.012
- Viridian #1E9167 ΔE 0.028
- Jungle Green #048243 ΔE 0.035
- Light Forest Green #4F9153 ΔE 0.042
- Fern Green #548D44 ΔE 0.043
- Kelley Green #009337 ΔE 0.046
- Dark Sage #598556 ΔE 0.051
- Forest Green #228B22 ΔE 0.051
Use #178C54 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.