#40BC91
Closest named color: Green Blue (#01C08D). oklch(71.6% 0.127 166.1), rgb(64, 188, 145).
Aa
Black text reads best on this color (8.82:1).
About this color
#40BC91 is a medium-light, moderately saturated green. In OKLCH its lightness is 72%, its chroma 0.127 and its hue 166°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Green Blue (#01C08D), ΔE 0.023 away. Black text reads best on it, at 8.82:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Green Blue (#01C08D) |
| Black text | 8.82:1 |
| White text | 2.38:1 |
Values
| HEX | #40BC91 |
| RGB | rgb(64, 188, 145) |
| HSL | hsl(159, 49%, 49%) |
| OKLCH | oklch(71.6% 0.127 166.1) |
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 #40BC91 | 2.38:1 | Fails | Lc -51.5 | Large or bold text, headings |
| Black text on #40BC91 | 8.82:1 | AAA | Lc 57.4 | Large or bold text, headings |
| #40BC91 text on white | 2.38:1 | Fails | Lc 46.6 | Large or bold text, headings |
| #40BC91 text on black | 8.82:1 | AAA | Lc -55.5 | 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
#EFF8F4
oklch(97.1% 0.011 167.8)
-
Step 100
100
#DCEFE6
oklch(93.6% 0.023 165.8)
-
Step 200
200
#BFE3D2
oklch(88.5% 0.044 165.2)
-
Step 300
300
#8ED1B5
oklch(80.8% 0.079 166.4)
-
Step 400
400 (this color)
#40BC91
oklch(71.6% 0.127 166.1)
-
Step 500
500
#00A277
oklch(63.2% 0.131 166)
-
Step 600
600
#008864
oklch(55.6% 0.115 166.4)
-
Step 700
700
#007253
oklch(49% 0.101 166.2)
-
Step 800
800
#005E44
oklch(42.7% 0.088 166.3)
-
Step 900
900
#004E38
oklch(37.6% 0.078 166.4)
-
Step 950
950
#002F20
oklch(27.1% 0.056 165.8)
#40BC91 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) | #B8AF8F | 0.126 |
| Deuteranopia (no green cones) | #A7A394 | 0.121 |
| Tritanopia (no blue cones) | #00BCB0 | 0.045 |
| Achromatopsia (no color) | #A8A8A8 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BC91
#40BC91
oklch(71.6% 0.127 166.1)
- #DB81B4
#DB81B4
oklch(71.5% 0.127 345.7)
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 #40BC91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Green Blue #01C08D ΔE 0.023
- Greeny Blue #42B395 ΔE 0.029
- Greenblue #23C48B ΔE 0.029
- Dark Seafoam #1FB57A ΔE 0.039
- Bluey Green #2BB179 ΔE 0.043
- Medium Sea Green #3CB371 ΔE 0.044
- Topaz #13BBAF ΔE 0.045
- Green Teal #0CB577 ΔE 0.045
Use #40BC91 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.