#378F4E
Closest named color: Sea Green (#2E8B57). oklch(58% 0.129 149.2), rgb(55, 143, 78).
Aa
Black text reads best on this color (5.20:1).
About this color
#378F4E is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.129 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.020 away. Black text reads best on it, at 5.20:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #378F4E |
| RGB | rgb(55, 143, 78) |
| HSL | hsl(136, 44%, 39%) |
| OKLCH | oklch(58% 0.129 149.2) |
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 #378F4E | 4.03:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #378F4E | 5.20:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #378F4E text on white | 4.03:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #378F4E text on black | 5.20:1 | AA | Lc -34.3 | 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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E3EDE4
oklch(93.6% 0.016 148.4)
-
Step 200
200
#CBDFCE
oklch(88.4% 0.031 149.8)
-
Step 300
300
#A7CCAD
oklch(81% 0.058 149.6)
-
Step 400
400
#76B181
oklch(70.7% 0.093 149.4)
-
Step 500
500
#4F9D61
oklch(63% 0.119 149.4)
-
Step 600
600 (this color)
#378F4E
oklch(58% 0.129 149.2)
-
Step 700
700
#207338
oklch(49.2% 0.121 149)
-
Step 800
800
#1D5E2F
oklch(42.8% 0.1 149.2)
-
Step 900
900
#1F4D2A
oklch(37.8% 0.078 149.2)
-
Step 950
950
#132D19
oklch(27% 0.049 149.6)
#378F4E 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) | #908349 | 0.106 |
| Deuteranopia (no green cones) | #857B52 | 0.105 |
| Tritanopia (no blue cones) | #1E8C7F | 0.073 |
| Achromatopsia (no color) | #7E7E7E | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378F4E
#378F4E
oklch(58% 0.129 149.2)
- #A45C9F
#A45C9F
oklch(58.1% 0.129 329.6)
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 #378F4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.020
- Light Forest Green #4F9153 ΔE 0.023
- Fern Green #548D44 ΔE 0.024
- Viridian #1E9167 ΔE 0.032
- Kelley Green #009337 ΔE 0.040
- Moss Green #658B38 ΔE 0.044
- Dark Sage #598556 ΔE 0.046
- Mossy Green #638B27 ΔE 0.047
Use #378F4E 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.