#55B121
Closest named color: Grass (#5CAC2D). oklch(67.7% 0.193 137.3), rgb(85, 177, 33).
Aa
Black text reads best on this color (7.69:1).
About this color
#55B121 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.193 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.018 away. Black text reads best on it, at 7.69:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.193) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.69:1 |
| White text | 2.72:1 |
Values
| HEX | #55B121 |
| RGB | rgb(85, 177, 33) |
| HSL | hsl(98, 69%, 41%) |
| OKLCH | oklch(67.7% 0.193 137.3) |
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 #55B121 | 2.72:1 | Fails | Lc -57.7 | Large or bold text, headings |
| Black text on #55B121 | 7.69:1 | AAA | Lc 51.6 | Large or bold text, headings |
| #55B121 text on white | 2.72:1 | Fails | Lc 52.4 | Large or bold text, headings |
| #55B121 text on black | 7.69:1 | AAA | Lc -49.4 | 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
#F0F8EE
oklch(97% 0.016 139.4)
-
Step 100
100
#DFF0D9
oklch(93.6% 0.035 137.5)
-
Step 200
200
#C5E4B9
oklch(88.5% 0.066 137)
-
Step 300
300
#9BD385
oklch(80.9% 0.12 137.2)
-
Step 400
400 (this color)
#55B121
oklch(67.7% 0.193 137.3)
-
Step 500
500
#46A200
oklch(63.1% 0.192 137.3)
-
Step 600
600
#3A8800
oklch(55.5% 0.169 137.3)
-
Step 700
700
#307300
oklch(49.2% 0.15 137.3)
-
Step 800
800
#265E00
oklch(42.7% 0.13 137.2)
-
Step 900
900
#1E4E00
oklch(37.5% 0.114 137.3)
-
Step 950
950
#0F2F00
oklch(27% 0.083 137.4)
#55B121 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) | #B7A100 | 0.122 |
| Deuteranopia (no green cones) | #AB9A33 | 0.122 |
| Tritanopia (no blue cones) | #4FAA97 | 0.137 |
| Achromatopsia (no color) | #9D9D9D | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B121
#55B121
oklch(67.7% 0.193 137.3)
- #C66AE4
#C66AE4
oklch(67.7% 0.193 317.2)
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 #55B121, closest first.
No curated palette has a color within ΔE 0.04 of #55B121.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.018
- Leafy Green #51B73B ΔE 0.020
- Leaf Green #5CA904 ΔE 0.022
- Frog Green #58BC08 ΔE 0.034
- Medium Green #39AD48 ΔE 0.036
- Leaf #71AA34 ΔE 0.038
- Shamrock #01B44C ΔE 0.039
- Kelly Green #02AB2E ΔE 0.043
Use #55B121 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.