#40B9DC
Closest named color: Turquoise Blue (#06B1C4). oklch(73.4% 0.116 221.1), rgb(64, 185, 220).
Aa
Black text reads best on this color (9.19:1).
About this color
#40B9DC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.116 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.046 away. Black text reads best on it, at 9.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #40B9DC |
| RGB | rgb(64, 185, 220) |
| HSL | hsl(193, 69%, 56%) |
| OKLCH | oklch(73.4% 0.116 221.1) |
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 #40B9DC | 2.28:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #40B9DC | 9.19:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #40B9DC text on white | 2.28:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #40B9DC text on black | 9.19:1 | AAA | Lc -57.4 | 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
#DCEDF4
oklch(93.6% 0.02 224.3)
-
Step 200
200
#BDE0EC
oklch(88.5% 0.04 220.6)
-
Step 300
300
#8BCCE2
oklch(80.9% 0.073 221.2)
-
Step 400
400 (this color)
#40B9DC
oklch(73.4% 0.116 221.1)
-
Step 500
500
#0099BB
oklch(63.2% 0.116 221)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#40B9DC 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) | #A4B4DE | 0.095 |
| Deuteranopia (no green cones) | #8FA5DC | 0.084 |
| Tritanopia (no blue cones) | #00C4C4 | 0.057 |
| Achromatopsia (no color) | #ABABAB | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B9DC
#40B9DC
oklch(73.4% 0.116 221.1)
- #E68F6F
#E68F6F
oklch(73.3% 0.115 40.9)
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 #40B9DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.046
- Vivid Sky Blue #4CC9F0 ΔE 0.049
- Deep Sky Blue #00BFFF ΔE 0.050
- Bright Sky Blue #02CCFE ΔE 0.061
- Dark Turquoise #00CED1 ΔE 0.067
- Topaz #13BBAF ΔE 0.074
- Lightblue #7BC8F6 ΔE 0.074
- Light Sea Green #20B2AA ΔE 0.077
Use #40B9DC 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.