#378B5D
Closest named color: Sea Green (#2E8B57). oklch(57.3% 0.109 156.4), rgb(55, 139, 93).
Aa
Black text reads best on this color (5.01:1).
About this color
#378B5D is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.109 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.011 away. Black text reads best on it, at 5.01:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #378B5D |
| RGB | rgb(55, 139, 93) |
| HSL | hsl(147, 43%, 38%) |
| OKLCH | oklch(57.3% 0.109 156.4) |
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 #378B5D | 4.18:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #378B5D | 5.01:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #378B5D text on white | 4.18:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #378B5D text on black | 5.01:1 | AA | Lc -33.0 | 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
#E3EDE6
oklch(93.7% 0.014 155.6)
-
Step 200
200
#CBDFD2
oklch(88.5% 0.028 157.3)
-
Step 300
300
#A8CBB4
oklch(81% 0.049 156.3)
-
Step 400
400
#77B08D
oklch(70.8% 0.079 156.8)
-
Step 500
500
#519C70
oklch(63.2% 0.101 156.2)
-
Step 600
600 (this color)
#378B5D
oklch(57.3% 0.109 156.4)
-
Step 700
700
#237148
oklch(49% 0.1 156.3)
-
Step 800
800
#1F5C3B
oklch(42.6% 0.084 156.3)
-
Step 900
900
#204C33
oklch(37.8% 0.065 156.4)
-
Step 950
950
#142C1E
oklch(26.9% 0.04 156.7)
#378B5D 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) | #8A815A | 0.098 |
| Deuteranopia (no green cones) | #7F7960 | 0.096 |
| Tritanopia (no blue cones) | #178A7F | 0.052 |
| Achromatopsia (no color) | #7C7C7C | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378B5D
#378B5D
oklch(57.3% 0.109 156.4)
- #A05E90
#A05E90
oklch(57.3% 0.108 336.5)
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 #378B5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.011
- Viridian #1E9167 ΔE 0.020
- Dark Sage #598556 ΔE 0.032
- Light Forest Green #4F9153 ΔE 0.033
- Fern Green #548D44 ΔE 0.039
- Ocean Green #3D9973 ΔE 0.046
- Jungle Green #048243 ΔE 0.050
- Slate Green #658D6D ΔE 0.054
Use #378B5D 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.