#40B8BF
Closest named color: Turquoise Blue (#06B1C4). oklch(72% 0.105 200.7), rgb(64, 184, 191).
Aa
Black text reads best on this color (8.82:1).
About this color
#40B8BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.105 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.032 away. Black text reads best on it, at 8.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.82:1 |
| White text | 2.37:1 |
Values
| HEX | #40B8BF |
| RGB | rgb(64, 184, 191) |
| HSL | hsl(183, 50%, 50%) |
| OKLCH | oklch(72% 0.105 200.7) |
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 #40B8BF | 2.37:1 | Fails | Lc -51.5 | Large or bold text, headings |
| Black text on #40B8BF | 8.82:1 | AAA | Lc 57.4 | Large or bold text, headings |
| #40B8BF text on white | 2.37:1 | Fails | Lc 46.6 | Large or bold text, headings |
| #40B8BF 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DCEEEF
oklch(93.6% 0.019 200.9)
-
Step 200
200
#BEE1E3
oklch(88.5% 0.037 200.8)
-
Step 300
300
#8ECED2
oklch(81% 0.065 200.9)
-
Step 400
400 (this color)
#40B8BF
oklch(72% 0.105 200.7)
-
Step 500
500
#009CA4
oklch(63% 0.107 201.2)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004B4F
oklch(37.5% 0.064 200.9)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#40B8BF 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) | #ABB0C0 | 0.107 |
| Deuteranopia (no green cones) | #98A2C0 | 0.099 |
| Tritanopia (no blue cones) | #00BFBA | 0.028 |
| Achromatopsia (no color) | #A8A8A8 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B8BF
#40B8BF
oklch(72% 0.105 200.7)
- #DE8988
#DE8988
oklch(71.8% 0.105 20.7)
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 #40B8BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.032
- Topaz #13BBAF ΔE 0.034
- Light Sea Green #20B2AA ΔE 0.038
- Dark Turquoise #00CED1 ΔE 0.059
- Greeny Blue #42B395 ΔE 0.059
- Medium Turquoise #48D1CC ΔE 0.070
- Greyblue #77A1B5 ΔE 0.071
- Cadet Blue #5F9EA0 ΔE 0.074
Use #40B8BF 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.