#378C5E
Closest named color: Sea Green (#2E8B57). oklch(57.6% 0.109 156.6), rgb(55, 140, 94).
Aa
Black text reads best on this color (5.07:1).
About this color
#378C5E is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.109 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.012 away. Black text reads best on it, at 5.07:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #378C5E |
| RGB | rgb(55, 140, 94) |
| HSL | hsl(148, 44%, 38%) |
| OKLCH | oklch(57.6% 0.109 156.6) |
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 #378C5E | 4.13:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #378C5E | 5.07:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #378C5E text on white | 4.13:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #378C5E text on black | 5.07:1 | AA | Lc -33.5 | 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)
#378C5E
oklch(57.6% 0.109 156.6)
-
Step 700
700
#217148
oklch(49% 0.101 156.6)
-
Step 800
800
#1E5C3C
oklch(42.6% 0.083 157.2)
-
Step 900
900
#204C33
oklch(37.8% 0.065 156.4)
-
Step 950
950
#142C1E
oklch(26.9% 0.04 156.7)
#378C5E 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) | #8B825B | 0.099 |
| Deuteranopia (no green cones) | #807961 | 0.098 |
| Tritanopia (no blue cones) | #168B80 | 0.052 |
| Achromatopsia (no color) | #7D7D7D | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378C5E
#378C5E
oklch(57.6% 0.109 156.6)
- #A15F91
#A15F91
oklch(57.6% 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 #378C5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.012
- Viridian #1E9167 ΔE 0.018
- Light Forest Green #4F9153 ΔE 0.031
- Dark Sage #598556 ΔE 0.033
- Fern Green #548D44 ΔE 0.038
- Ocean Green #3D9973 ΔE 0.043
- Jungle Green #048243 ΔE 0.052
- Slate Green #658D6D ΔE 0.053
Use #378C5E 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.