#40BDEF
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.1% 0.129 229.2), rgb(64, 189, 239).
Aa
Black text reads best on this color (9.74:1).
About this color
#40BDEF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.129 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.026 away. Black text reads best on it, at 9.74:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.74:1 |
| White text | 2.15:1 |
Values
| HEX | #40BDEF |
| RGB | rgb(64, 189, 239) |
| HSL | hsl(197, 85%, 59%) |
| OKLCH | oklch(75.1% 0.129 229.2) |
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 #40BDEF | 2.15:1 | Fails | Lc -46.6 | Large or bold text, headings |
| Black text on #40BDEF | 9.74:1 | AAA | Lc 62.0 | Content text, not long reading |
| #40BDEF text on white | 2.15:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #40BDEF text on black | 9.74:1 | AAA | Lc -60.3 | Content text, not long reading |
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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DBEDF6
oklch(93.5% 0.023 229.1)
-
Step 200
200
#BCDFF1
oklch(88.4% 0.044 230.3)
-
Step 300
300
#89CBEA
oklch(80.9% 0.08 229.1)
-
Step 400
400 (this color)
#40BDEF
oklch(75.1% 0.129 229.2)
-
Step 500
500
#0096C5
oklch(63% 0.125 229.4)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#40BDEF 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) | #A3BAF1 | 0.090 |
| Deuteranopia (no green cones) | #8BA9EE | 0.078 |
| Tritanopia (no blue cones) | #00CBCE | 0.073 |
| Achromatopsia (no color) | #B1B1B1 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BDEF
#40BDEF
oklch(75.1% 0.129 229.2)
- #EF9461
#EF9461
oklch(75% 0.129 49.2)
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 #40BDEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.026
- Vivid Sky Blue #4CC9F0 ΔE 0.035
- Bright Sky Blue #02CCFE ΔE 0.041
- Lightblue #7BC8F6 ΔE 0.058
- Carolina Blue #8AB8FE ΔE 0.068
- Sky #82CAFC ΔE 0.069
- Turquoise Blue #06B1C4 ΔE 0.072
- Dark Turquoise #00CED1 ΔE 0.076
Use #40BDEF 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.