#40BBB1
Closest named color: Topaz (#13BBAF). oklch(72.2% 0.108 187.3), rgb(64, 187, 177).
Aa
Black text reads best on this color (8.96:1).
About this color
#40BBB1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.108 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.017 away. Black text reads best on it, at 8.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.96:1 |
| White text | 2.34:1 |
Values
| HEX | #40BBB1 |
| RGB | rgb(64, 187, 177) |
| HSL | hsl(175, 49%, 49%) |
| OKLCH | oklch(72.2% 0.108 187.3) |
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 #40BBB1 | 2.34:1 | Fails | Lc -50.8 | Large or bold text, headings |
| Black text on #40BBB1 | 8.96:1 | AAA | Lc 58.1 | Large or bold text, headings |
| #40BBB1 text on white | 2.34:1 | Fails | Lc 45.9 | Large or bold text, headings |
| #40BBB1 text on black | 8.96:1 | AAA | Lc -56.2 | 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
#EFF7F6
oklch(97% 0.009 188.1)
-
Step 100
100
#DCEEEC
oklch(93.5% 0.019 188.8)
-
Step 200
200
#BEE2DD
oklch(88.5% 0.038 186.3)
-
Step 300
300
#8DCFC8
oklch(80.8% 0.068 187.6)
-
Step 400
400 (this color)
#40BBB1
oklch(72.2% 0.108 187.3)
-
Step 500
500
#009E95
oklch(63% 0.11 187.7)
-
Step 600
600
#00857D
oklch(55.5% 0.097 187.4)
-
Step 700
700
#007069
oklch(49.1% 0.086 187.3)
-
Step 800
800
#005C56
oklch(42.8% 0.075 187.1)
-
Step 900
900
#004D48
oklch(37.8% 0.066 187.3)
-
Step 950
950
#002E2A
oklch(27.1% 0.048 185.8)
#40BBB1 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) | #B1B1B1 | 0.114 |
| Deuteranopia (no green cones) | #9FA4B2 | 0.107 |
| Tritanopia (no blue cones) | #00BFB8 | 0.019 |
| Achromatopsia (no color) | #A9A9A9 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BBB1
#40BBB1
oklch(72.2% 0.108 187.3)
- #DF8899
#DF8899
oklch(72.2% 0.108 7.5)
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 #40BBB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.017
- Light Sea Green #20B2AA ΔE 0.032
- Greeny Blue #42B395 ΔE 0.040
- Turquoise Blue #06B1C4 ΔE 0.050
- Dark Turquoise #00CED1 ΔE 0.058
- Green Blue #01C08D ΔE 0.063
- Medium Aquamarine #66CDAA ΔE 0.065
- Medium Turquoise #48D1CC ΔE 0.065
Use #40BBB1 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.