#378A63
Closest named color: Sea Green (#2E8B57). oklch(57.2% 0.101 160.1), rgb(55, 138, 99).
Aa
Black text reads best on this color (4.97:1).
About this color
#378A63 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.101 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 0.020 away. Black text reads best on it, at 4.97:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.101) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #378A63 |
| RGB | rgb(55, 138, 99) |
| HSL | hsl(152, 43%, 38%) |
| OKLCH | oklch(57.2% 0.101 160.1) |
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 #378A63 | 4.21:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #378A63 | 4.97:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #378A63 text on white | 4.21:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #378A63 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E3EDE7
oklch(93.7% 0.013 159.9)
-
Step 200
200
#CCDFD3
oklch(88.6% 0.026 158.1)
-
Step 300
300
#A8CAB7
oklch(80.9% 0.045 160.7)
-
Step 400
400
#78AF91
oklch(70.7% 0.073 159.9)
-
Step 500
500
#529B76
oklch(63.1% 0.093 160)
-
Step 600
600 (this color)
#378A63
oklch(57.2% 0.101 160.1)
-
Step 700
700
#23714E
oklch(49.2% 0.095 160.1)
-
Step 800
800
#205C40
oklch(42.7% 0.078 160)
-
Step 900
900
#204B36
oklch(37.5% 0.061 160.2)
-
Step 950
950
#142C20
oklch(26.9% 0.038 160.6)
#378A63 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) | #888061 | 0.096 |
| Deuteranopia (no green cones) | #7D7865 | 0.093 |
| Tritanopia (no blue cones) | #12897F | 0.044 |
| Achromatopsia (no color) | #7B7B7B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378A63
#378A63
oklch(57.2% 0.101 160.1)
- #9F5F8A
#9F5F8A
oklch(57.1% 0.101 340.3)
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 #378A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.020
- Viridian #1E9167 ΔE 0.022
- Dark Sage #598556 ΔE 0.032
- Light Forest Green #4F9153 ΔE 0.040
- Ocean Green #3D9973 ΔE 0.046
- Fern Green #548D44 ΔE 0.047
- Slate Green #658D6D ΔE 0.051
- Jungle Green #048243 ΔE 0.055
Use #378A63 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.