#40BFDB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.7% 0.115 215.7), rgb(64, 191, 219).
Aa
Black text reads best on this color (9.69:1).
About this color
#40BFDB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.115 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.038 away. Black text reads best on it, at 9.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.69:1 |
| White text | 2.16:1 |
Values
| HEX | #40BFDB |
| RGB | rgb(64, 191, 219) |
| HSL | hsl(191, 68%, 55%) |
| OKLCH | oklch(74.7% 0.115 215.7) |
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 #40BFDB | 2.16:1 | Fails | Lc -46.9 | Large or bold text, headings |
| Black text on #40BFDB | 9.69:1 | AAA | Lc 61.7 | Content text, not long reading |
| #40BFDB text on white | 2.16:1 | Fails | Lc 42.2 | Non-text elements, placeholder text |
| #40BFDB text on black | 9.69:1 | AAA | Lc -60.0 | 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
#EFF7FA
oklch(97.1% 0.009 222.1)
-
Step 100
100
#DBEEF3
oklch(93.7% 0.021 215.3)
-
Step 200
200
#BCE0EA
oklch(88.4% 0.04 216.4)
-
Step 300
300
#8ACDDE
oklch(80.9% 0.072 215.4)
-
Step 400
400 (this color)
#40BFDB
oklch(74.7% 0.115 215.7)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#40BFDB 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) | #ACB9DD | 0.102 |
| Deuteranopia (no green cones) | #96A9DB | 0.092 |
| Tritanopia (no blue cones) | #00C9C8 | 0.049 |
| Achromatopsia (no color) | #B0B0B0 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BFDB
#40BFDB
oklch(74.7% 0.115 215.7)
- #EC927A
#EC927A
oklch(74.7% 0.115 35.7)
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 #40BFDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.038
- Dark Turquoise #00CED1 ΔE 0.050
- Bright Sky Blue #02CCFE ΔE 0.053
- Turquoise Blue #06B1C4 ΔE 0.054
- Deep Sky Blue #00BFFF ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.062
- Aqua Blue #02D8E9 ΔE 0.066
- Lightblue #7BC8F6 ΔE 0.067
Use #40BFDB 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.