#178E5F
Closest named color: Sea Green (#2E8B57). oklch(57.4% 0.123 160.3), rgb(23, 142, 95).
Aa
Black text reads best on this color (5.07:1).
About this color
#178E5F is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.123 and its hue 160°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.013 away. Black text reads best on it, at 5.07:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.07:1 |
| White text | 4.14:1 |
Values
| HEX | #178E5F |
| RGB | rgb(23, 142, 95) |
| HSL | hsl(156, 72%, 32%) |
| OKLCH | oklch(57.4% 0.123 160.3) |
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 #178E5F | 4.14:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #178E5F | 5.07:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #178E5F text on white | 4.14:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #178E5F text on black | 5.07:1 | AA | Lc -33.6 | 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
#F1F7F4
oklch(97.1% 0.007 164.9)
-
Step 100
100
#E1EDE6
oklch(93.5% 0.016 160.6)
-
Step 200
200
#C9E0D2
oklch(88.6% 0.031 159)
-
Step 300
300
#A2CCB5
oklch(80.9% 0.055 160.9)
-
Step 400
400
#6DB28E
oklch(70.7% 0.088 160.2)
-
Step 500
500
#3F9E72
oklch(63.1% 0.112 160.4)
-
Step 600
600 (this color)
#178E5F
oklch(57.4% 0.123 160.3)
-
Step 700
700
#00734B
oklch(49% 0.11 160.6)
-
Step 800
800
#045E3D
oklch(42.6% 0.094 160.6)
-
Step 900
900
#134D34
oklch(37.6% 0.073 160.6)
-
Step 950
950
#0E2D1F
oklch(26.9% 0.046 161.4)
#178E5F 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) | #8C825C | 0.116 |
| Deuteranopia (no green cones) | #7E7962 | 0.112 |
| Tritanopia (no blue cones) | #008D82 | 0.053 |
| Achromatopsia (no color) | #7D7D7D | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178E5F
#178E5F
oklch(57.4% 0.123 160.3)
- #A7598F
#A7598F
oklch(57.3% 0.123 340)
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 #178E5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.013
- Viridian #1E9167 ΔE 0.014
- Light Forest Green #4F9153 ΔE 0.040
- Fern Green #548D44 ΔE 0.047
- Jungle Green #048243 ΔE 0.047
- Ocean Green #3D9973 ΔE 0.047
- Dark Sage #598556 ΔE 0.049
- Kelley Green #009337 ΔE 0.056
Use #178E5F 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.