#40AE91
Closest named color: Greeny Blue (#42B395). oklch(68% 0.109 172.3), rgb(64, 174, 145).
Aa
Black text reads best on this color (7.68:1).
About this color
#40AE91 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 68%, its chroma 0.109 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.015 away. Black text reads best on it, at 7.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 7.68:1 |
| White text | 2.73:1 |
Values
| HEX | #40AE91 |
| RGB | rgb(64, 174, 145) |
| HSL | hsl(164, 46%, 47%) |
| OKLCH | oklch(68% 0.109 172.3) |
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 #40AE91 | 2.73:1 | Fails | Lc -57.8 | Large or bold text, headings |
| Black text on #40AE91 | 7.68:1 | AAA | Lc 51.4 | Large or bold text, headings |
| #40AE91 text on white | 2.73:1 | Fails | Lc 52.6 | Large or bold text, headings |
| #40AE91 text on black | 7.68:1 | AAA | Lc -49.3 | 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
#F0F8F5
oklch(97.2% 0.009 171.8)
-
Step 100
100
#DDEEE8
oklch(93.5% 0.02 172.8)
-
Step 200
200
#C1E2D6
oklch(88.5% 0.038 171.4)
-
Step 300
300
#93CFBC
oklch(80.8% 0.067 172.9)
-
Step 400
400 (this color)
#40AE91
oklch(68% 0.109 172.3)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#40AE91 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) | #A9A390 | 0.113 |
| Deuteranopia (no green cones) | #999893 | 0.107 |
| Tritanopia (no blue cones) | #00B0A6 | 0.032 |
| Achromatopsia (no color) | #9C9C9C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40AE91
#40AE91
oklch(68% 0.109 172.3)
- #CC7B9F
#CC7B9F
oklch(68% 0.11 352.3)
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 #40AE91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.015
- Light Sea Green #20B2AA ΔE 0.035
- Tea #65AB7C ΔE 0.035
- Dark Seafoam Green #3EAF76 ΔE 0.040
- Bluey Green #2BB179 ΔE 0.041
- Topaz #13BBAF ΔE 0.047
- Dark Seafoam #1FB57A ΔE 0.047
- Jade #1FA774 ΔE 0.048
Use #40AE91 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.