#178F4F
Closest named color: Sea Green (#2E8B57). oklch(57.3% 0.139 153.3), rgb(23, 143, 79).
Aa
Black text reads best on this color (5.07:1).
About this color
#178F4F is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.139 and its hue 153°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.022 away. Black text reads best on it, at 5.07:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #178F4F |
| RGB | rgb(23, 143, 79) |
| HSL | hsl(148, 72%, 33%) |
| OKLCH | oklch(57.3% 0.139 153.3) |
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 #178F4F | 4.13:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #178F4F | 5.07:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #178F4F text on white | 4.13:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #178F4F text on black | 5.07:1 | AA | Lc -33.7 | 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
#E1EEE4
oklch(93.7% 0.019 152.8)
-
Step 200
200
#C9E0CF
oklch(88.5% 0.034 153.6)
-
Step 300
300
#A2CDAE
oklch(80.9% 0.063 153.5)
-
Step 400
400
#6DB383
oklch(70.7% 0.1 153.2)
-
Step 500
500
#3F9F64
oklch(63% 0.127 153.5)
-
Step 600
600 (this color)
#178F4F
oklch(57.3% 0.139 153.3)
-
Step 700
700
#00743D
oklch(49% 0.125 153.5)
-
Step 800
800
#045F31
oklch(42.6% 0.107 153.2)
-
Step 900
900
#134E2C
oklch(37.7% 0.083 153.7)
-
Step 950
950
#0E2E1A
oklch(27.1% 0.053 153.4)
#178F4F 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) | #8F824A | 0.121 |
| Deuteranopia (no green cones) | #827953 | 0.119 |
| Tritanopia (no blue cones) | #008D7F | 0.071 |
| Achromatopsia (no color) | #7D7D7D | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F4F
#178F4F
oklch(57.3% 0.139 153.3)
- #A7559B
#A7559B
oklch(57.3% 0.139 333)
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 #178F4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.022
- Viridian #1E9167 ΔE 0.033
- Kelley Green #009337 ΔE 0.034
- Light Forest Green #4F9153 ΔE 0.039
- Fern Green #548D44 ΔE 0.039
- Jungle Green #048243 ΔE 0.041
- Forest Green #228B22 ΔE 0.043
- Irish Green #019529 ΔE 0.049
Use #178F4F 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.