#378A5D
Closest named color: Sea Green (#2E8B57). oklch(57% 0.107 156.7), rgb(55, 138, 93).
Aa
Black text reads best on this color (4.95:1).
About this color
#378A5D is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.107 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 4.95:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.107) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #378A5D |
| RGB | rgb(55, 138, 93) |
| HSL | hsl(147, 43%, 38%) |
| OKLCH | oklch(57% 0.107 156.7) |
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 #378A5D | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #378A5D | 4.95:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #378A5D text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #378A5D text on black | 4.95:1 | AA | Lc -32.7 | 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
#CCDFD2
oklch(88.6% 0.027 155.9)
-
Step 300
300
#A8CAB4
oklch(80.8% 0.048 156.8)
-
Step 400
400
#78AF8D
oklch(70.6% 0.076 156.7)
-
Step 500
500
#529B71
oklch(63% 0.098 156.8)
-
Step 600
600 (this color)
#378A5D
oklch(57% 0.107 156.7)
-
Step 700
700
#247149
oklch(49.1% 0.099 156.7)
-
Step 800
800
#205C3C
oklch(42.6% 0.082 156.7)
-
Step 900
900
#214C33
oklch(37.8% 0.065 155.9)
-
Step 950
950
#142C1E
oklch(26.9% 0.04 156.7)
#378A5D 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) | #89805A | 0.097 |
| Deuteranopia (no green cones) | #7E7860 | 0.095 |
| Tritanopia (no blue cones) | #18897E | 0.050 |
| Achromatopsia (no color) | #7B7B7B | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378A5D
#378A5D
oklch(57% 0.107 156.7)
- #9F5D8F
#9F5D8F
oklch(57% 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 #378A5D, 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 0.022
- Dark Sage #598556 ΔE 0.031
- Light Forest Green #4F9153 ΔE 0.035
- Fern Green #548D44 ΔE 0.041
- Ocean Green #3D9973 ΔE 0.049
- Jungle Green #048243 ΔE 0.049
- Slate Green #658D6D ΔE 0.055
Use #378A5D 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.