#40B8CF
Closest named color: Turquoise Blue (#06B1C4). oklch(72.6% 0.109 213), rgb(64, 184, 207).
Aa
Black text reads best on this color (8.97:1).
About this color
#40B8CF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.109 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.033 away. Black text reads best on it, at 8.97:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.97:1 |
| White text | 2.33:1 |
Values
| HEX | #40B8CF |
| RGB | rgb(64, 184, 207) |
| HSL | hsl(190, 60%, 53%) |
| OKLCH | oklch(72.6% 0.109 213) |
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 #40B8CF | 2.33:1 | Fails | Lc -50.7 | Large or bold text, headings |
| Black text on #40B8CF | 8.97:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #40B8CF text on white | 2.33:1 | Fails | Lc 45.8 | Large or bold text, headings |
| #40B8CF text on black | 8.97:1 | AAA | Lc -56.3 | 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
#EFF7F9
oklch(97.1% 0.009 214.3)
-
Step 100
100
#DCEEF2
oklch(93.7% 0.02 212.5)
-
Step 200
200
#BEE0E8
oklch(88.5% 0.037 213.5)
-
Step 300
300
#8DCDDB
oklch(81% 0.068 212.8)
-
Step 400
400 (this color)
#40B8CF
oklch(72.6% 0.109 213)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#40B8CF 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) | #A7B2D0 | 0.100 |
| Deuteranopia (no green cones) | #92A3CF | 0.090 |
| Tritanopia (no blue cones) | #00C1BF | 0.044 |
| Achromatopsia (no color) | #A9A9A9 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B8CF
#40B8CF
oklch(72.6% 0.109 213)
- #E28C7A
#E28C7A
oklch(72.5% 0.109 32.6)
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 #40B8CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.033
- Topaz #13BBAF ΔE 0.056
- Light Sea Green #20B2AA ΔE 0.058
- Vivid Sky Blue #4CC9F0 ΔE 0.061
- Dark Turquoise #00CED1 ΔE 0.062
- Deep Sky Blue #00BFFF ΔE 0.068
- Greyblue #77A1B5 ΔE 0.071
- Medium Turquoise #48D1CC ΔE 0.074
Use #40B8CF 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.