#40BF64
Closest named color: Algae Green (#21C36F). oklch(71.4% 0.171 149.2), rgb(64, 191, 100).
Aa
Black text reads best on this color (8.85:1).
About this color
#40BF64 is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.171 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae Green (#21C36F), ΔE 0.016 away. Black text reads best on it, at 8.85:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.171) |
| Temperature | in between |
| Nearest name | Algae Green (#21C36F) |
| Black text | 8.85:1 |
| White text | 2.37:1 |
Values
| HEX | #40BF64 |
| RGB | rgb(64, 191, 100) |
| HSL | hsl(137, 50%, 50%) |
| OKLCH | oklch(71.4% 0.171 149.2) |
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 #40BF64 | 2.37:1 | Fails | Lc -51.3 | Large or bold text, headings |
| Black text on #40BF64 | 8.85:1 | AAA | Lc 57.6 | Large or bold text, headings |
| #40BF64 text on white | 2.37:1 | Fails | Lc 46.3 | Large or bold text, headings |
| #40BF64 text on black | 8.85:1 | AAA | Lc -55.7 | 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
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DCF0DF
oklch(93.6% 0.031 149.8)
-
Step 200
200
#BFE5C4
oklch(88.6% 0.06 148.8)
-
Step 300
300
#8ED49B
oklch(80.8% 0.107 149.4)
-
Step 400
400 (this color)
#40BF64
oklch(71.4% 0.171 149.2)
-
Step 500
500
#00A548
oklch(63% 0.177 149.3)
-
Step 600
600
#008B3B
oklch(55.6% 0.156 149.2)
-
Step 700
700
#007531
oklch(49.1% 0.138 149.3)
-
Step 800
800
#006027
oklch(42.7% 0.12 149.3)
-
Step 900
900
#00501F
oklch(37.7% 0.106 149.2)
-
Step 950
950
#003010
oklch(27% 0.075 149.4)
#40BF64 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) | #C0AF5D | 0.138 |
| Deuteranopia (no green cones) | #B1A46A | 0.137 |
| Tritanopia (no blue cones) | #05BBA9 | 0.096 |
| Achromatopsia (no color) | #A8A8A8 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BF64
#40BF64
oklch(71.4% 0.171 149.2)
- #DB77D6
#DB77D6
oklch(71.3% 0.171 329)
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 #40BF64, closest first.
No curated palette has a color within ΔE 0.04 of #40BF64.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae Green #21C36F ΔE 0.016
- Dark Mint #48C072 ΔE 0.018
- Dark Mint Green #20C073 ΔE 0.019
- Cool Green #33B864 ΔE 0.023
- Shamrock Green #02C14D ΔE 0.035
- Leafy Green #51B73B ΔE 0.038
- Boring Green #63B365 ΔE 0.041
- Turtle Green #75B84F ΔE 0.041
Use #40BF64 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.