#42A137
Closest named color: Mid Green (#50A747). oklch(63% 0.169 141.6), rgb(66, 161, 55).
Aa
Black text reads best on this color (6.38:1).
About this color
#42A137 is a medium-light, vivid green. In OKLCH its lightness is 63%, its chroma 0.169 and its hue 142°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Mid Green (#50A747), ΔE 0.026 away. Black text reads best on it, at 6.38:1.
| Hue family | Greens |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.169) |
| Temperature | in between |
| Nearest name | Mid Green (#50A747) |
| Black text | 6.38:1 |
| White text | 3.28:1 |
Values
| HEX | #42A137 |
| RGB | rgb(66, 161, 55) |
| HSL | hsl(114, 49%, 42%) |
| OKLCH | oklch(63% 0.169 141.6) |
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 #42A137 | 3.28:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #42A137 | 6.38:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #42A137 text on white | 3.28:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #42A137 text on black | 6.38:1 | AA | Lc -41.8 | 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 500.
-
Step 50
50
#F1F7F1
oklch(97% 0.01 145.5)
-
Step 100
100
#E1EEDF
oklch(93.5% 0.024 141.5)
-
Step 200
200
#C9E1C5
oklch(88.4% 0.046 141.2)
-
Step 300
300
#A3CF9D
oklch(81% 0.083 141.7)
-
Step 400
400
#6EB566
oklch(70.7% 0.132 141.8)
-
Step 500
500 (this color)
#42A137
oklch(63% 0.169 141.6)
-
Step 600
600
#188C03
oklch(55.7% 0.184 141.6)
-
Step 700
700
#107600
oklch(49.2% 0.164 141.6)
-
Step 800
800
#0D6001
oklch(42.6% 0.141 141.6)
-
Step 900
900
#164F10
oklch(37.7% 0.11 141.8)
-
Step 950
950
#0F2E0C
oklch(26.8% 0.069 141.9)
#42A137 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) | #A5932A | 0.118 |
| Deuteranopia (no green cones) | #998B40 | 0.118 |
| Tritanopia (no blue cones) | #349C8B | 0.111 |
| Achromatopsia (no color) | #8E8E8E | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A137
#42A137
oklch(63% 0.169 141.6)
- #B761C5
#B761C5
oklch(63% 0.169 321.9)
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 #42A137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Green #50A747 ΔE 0.026
- Grassy Green #419C03 ΔE 0.027
- Grass Green #3F9B0B ΔE 0.028
- Medium Green #39AD48 ΔE 0.034
- Kelly Green #02AB2E ΔE 0.038
- Leaf Green #5CA904 ΔE 0.042
- Muted Green #5FA052 ΔE 0.042
- Grass #5CAC2D ΔE 0.043
Use #42A137 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.