#40BCB9
Closest named color: Topaz (#13BBAF). oklch(72.7% 0.107 192.7), rgb(64, 188, 185).
Aa
Black text reads best on this color (9.11:1).
About this color
#40BCB9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.107 and its hue 193°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.024 away. Black text reads best on it, at 9.11:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.11:1 |
| White text | 2.30:1 |
Values
| HEX | #40BCB9 |
| RGB | rgb(64, 188, 185) |
| HSL | hsl(179, 49%, 49%) |
| OKLCH | oklch(72.7% 0.107 192.7) |
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 #40BCB9 | 2.30:1 | Fails | Lc -50.0 | Large or bold text, headings |
| Black text on #40BCB9 | 9.11:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #40BCB9 text on white | 2.30:1 | Fails | Lc 45.1 | Large or bold text, headings |
| #40BCB9 text on black | 9.11:1 | AAA | Lc -57.0 | 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
#EFF7F7
oklch(97% 0.008 197)
-
Step 100
100
#DCEEED
oklch(93.6% 0.019 192.8)
-
Step 200
200
#BEE1E0
oklch(88.4% 0.037 194.4)
-
Step 300
300
#8DCFCC
oklch(81% 0.067 192.3)
-
Step 400
400 (this color)
#40BCB9
oklch(72.7% 0.107 192.7)
-
Step 500
500
#009E9B
oklch(63.2% 0.108 192.4)
-
Step 600
600
#008482
oklch(55.5% 0.095 192.9)
-
Step 700
700
#006F6E
oklch(49% 0.084 193.7)
-
Step 800
800
#005B5A
oklch(42.6% 0.073 193.5)
-
Step 900
900
#004C4B
oklch(37.7% 0.064 193.2)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#40BCB9 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) | #B1B3B9 | 0.113 |
| Deuteranopia (no green cones) | #9EA5BA | 0.105 |
| Tritanopia (no blue cones) | #00C1BB | 0.020 |
| Achromatopsia (no color) | #ABABAB | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BCB9
#40BCB9
oklch(72.7% 0.107 192.7)
- #E18A94
#E18A94
oklch(72.7% 0.107 12.6)
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 #40BCB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.024
- Light Sea Green #20B2AA ΔE 0.038
- Turquoise Blue #06B1C4 ΔE 0.046
- Greeny Blue #42B395 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.051
- Medium Turquoise #48D1CC ΔE 0.060
- Medium Aquamarine #66CDAA ΔE 0.067
- Green Blue #01C08D ΔE 0.073
Use #40BCB9 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.