#37B577
Closest named color: Medium Sea Green (#3CB371). oklch(68.9% 0.143 157.3), rgb(55, 181, 119).
Aa
Black text reads best on this color (8.03:1).
About this color
#37B577 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.143 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Sea Green (#3CB371), ΔE 0.008 away. Black text reads best on it, at 8.03:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Medium Sea Green (#3CB371) |
| Black text | 8.03:1 |
| White text | 2.61:1 |
Values
| HEX | #37B577 |
| RGB | rgb(55, 181, 119) |
| HSL | hsl(150, 53%, 46%) |
| OKLCH | oklch(68.9% 0.143 157.3) |
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 #37B577 | 2.61:1 | Fails | Lc -55.7 | Large or bold text, headings |
| Black text on #37B577 | 8.03:1 | AAA | Lc 53.4 | Large or bold text, headings |
| #37B577 text on white | 2.61:1 | Fails | Lc 50.6 | Large or bold text, headings |
| #37B577 text on black | 8.03:1 | AAA | Lc -51.3 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF8F2
oklch(97.1% 0.012 157)
-
Step 100
100
#DDEFE3
oklch(93.5% 0.025 156.7)
-
Step 200
200
#BFE4CC
oklch(88.6% 0.051 156.8)
-
Step 300
300
#8FD2AA
oklch(80.8% 0.089 157.5)
-
Step 400
400 (this color)
#37B577
oklch(68.9% 0.143 157.3)
-
Step 500
500
#00A364
oklch(63% 0.149 157.4)
-
Step 600
600
#008953
oklch(55.5% 0.131 157.3)
-
Step 700
700
#007445
oklch(49.2% 0.117 157)
-
Step 800
800
#005F38
oklch(42.7% 0.101 157.3)
-
Step 900
900
#004F2E
oklch(37.6% 0.089 157.5)
-
Step 950
950
#002F19
oklch(26.9% 0.064 157.1)
#37B577 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) | #B4A773 | 0.131 |
| Deuteranopia (no green cones) | #A49C7B | 0.127 |
| Tritanopia (no blue cones) | #00B4A5 | 0.065 |
| Achromatopsia (no color) | #A0A0A0 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37B577
#37B577
oklch(68.9% 0.143 157.3)
- #D276BB
#D276BB
oklch(68.9% 0.143 337.1)
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 #37B577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Sea Green #3CB371 ΔE 0.008
- Dark Seafoam #1FB57A ΔE 0.009
- Green Teal #0CB577 ΔE 0.013
- Bluey Green #2BB179 ΔE 0.015
- Dark Seafoam Green #3EAF76 ΔE 0.017
- Jade Green #2BAF6A ΔE 0.023
- Seaweed Green #35AD6B ΔE 0.025
- Algae #54AC68 ΔE 0.028
Use #37B577 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.