#378E4B
Closest named color: Sea Green (#2E8B57). oklch(57.7% 0.131 148.4), rgb(55, 142, 75).
Aa
Black text reads best on this color (5.13:1).
About this color
#378E4B is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.131 and its hue 148°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.021 away. Black text reads best on it, at 5.13:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.13:1 |
| White text | 4.09:1 |
Values
| HEX | #378E4B |
| RGB | rgb(55, 142, 75) |
| HSL | hsl(134, 44%, 39%) |
| OKLCH | oklch(57.7% 0.131 148.4) |
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 #378E4B | 4.09:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #378E4B | 5.13:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #378E4B text on white | 4.09:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #378E4B text on black | 5.13:1 | AA | Lc -33.9 | 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
#F2F7F2
oklch(97.1% 0.008 145.5)
-
Step 100
100
#E3EDE4
oklch(93.6% 0.016 148.4)
-
Step 200
200
#CBDFCD
oklch(88.4% 0.032 148.2)
-
Step 300
300
#A7CCAC
oklch(81% 0.06 148.8)
-
Step 400
400
#77B180
oklch(70.7% 0.093 148.5)
-
Step 500
500
#509D5F
oklch(63% 0.12 148.4)
-
Step 600
600 (this color)
#378E4B
oklch(57.7% 0.131 148.4)
-
Step 700
700
#217336
oklch(49.2% 0.122 148.2)
-
Step 800
800
#1E5E2D
oklch(42.8% 0.102 148.1)
-
Step 900
900
#1F4D29
oklch(37.8% 0.079 148.6)
-
Step 950
950
#132D18
oklch(27% 0.05 148.5)
#378E4B 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) | #8F8246 | 0.105 |
| Deuteranopia (no green cones) | #847A50 | 0.105 |
| Tritanopia (no blue cones) | #208B7E | 0.075 |
| Achromatopsia (no color) | #7D7D7D | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378E4B
#378E4B
oklch(57.7% 0.131 148.4)
- #A25BA0
#A25BA0
oklch(57.8% 0.13 328.1)
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 #378E4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.021
- Fern Green #548D44 ΔE 0.024
- Light Forest Green #4F9153 ΔE 0.026
- Viridian #1E9167 ΔE 0.035
- Kelley Green #009337 ΔE 0.038
- Moss Green #658B38 ΔE 0.043
- Forest Green #228B22 ΔE 0.045
- Mossy Green #638B27 ΔE 0.046
Use #378E4B 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.