#378B50
Closest named color: Sea Green (#2E8B57). oklch(57% 0.122 150.5), rgb(55, 139, 80).
Aa
Black text reads best on this color (4.97:1).
About this color
#378B50 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.122 and its hue 150°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.010 away. Black text reads best on it, at 4.97:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.122) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.97:1 |
| White text | 4.22:1 |
Values
| HEX | #378B50 |
| RGB | rgb(55, 139, 80) |
| HSL | hsl(138, 43%, 38%) |
| OKLCH | oklch(57% 0.122 150.5) |
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 #378B50 | 4.22:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #378B50 | 4.97:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #378B50 text on white | 4.22:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #378B50 text on black | 4.97:1 | AA | Lc -32.8 | 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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E3EDE4
oklch(93.6% 0.016 148.4)
-
Step 200
200
#CCDFCF
oklch(88.5% 0.03 150.1)
-
Step 300
300
#A8CBAF
oklch(80.9% 0.054 151)
-
Step 400
400
#78B084
oklch(70.6% 0.087 150.4)
-
Step 500
500
#529C65
oklch(63% 0.111 150.5)
-
Step 600
600 (this color)
#378B50
oklch(57% 0.122 150.5)
-
Step 700
700
#24723D
oklch(49.1% 0.113 150.5)
-
Step 800
800
#205D33
oklch(42.7% 0.093 150.7)
-
Step 900
900
#214C2D
oklch(37.6% 0.072 150.7)
-
Step 950
950
#142D1A
oklch(27.1% 0.047 150)
#378B50 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) | #8C804C | 0.102 |
| Deuteranopia (no green cones) | #817854 | 0.101 |
| Tritanopia (no blue cones) | #1F897C | 0.065 |
| Achromatopsia (no color) | #7B7B7B | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378B50
#378B50
oklch(57% 0.122 150.5)
- #9F5B99
#9F5B99
oklch(57.1% 0.121 330.3)
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 #378B50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.010
- Fern Green #548D44 ΔE 0.029
- Light Forest Green #4F9153 ΔE 0.030
- Viridian #1E9167 ΔE 0.030
- Dark Sage #598556 ΔE 0.038
- Jungle Green #048243 ΔE 0.041
- Moss Green #658B38 ΔE 0.047
- Kelley Green #009337 ΔE 0.049
Use #378B50 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.