#40B4DA
Closest named color: Turquoise Blue (#06B1C4). oklch(72.1% 0.115 223.9), rgb(64, 180, 218).
Aa
Black text reads best on this color (8.75:1).
About this color
#40B4DA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.115 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.040 away. Black text reads best on it, at 8.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.75:1 |
| White text | 2.39:1 |
Values
| HEX | #40B4DA |
| RGB | rgb(64, 180, 218) |
| HSL | hsl(195, 68%, 55%) |
| OKLCH | oklch(72.1% 0.115 223.9) |
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 #40B4DA | 2.39:1 | Fails | Lc -51.9 | Large or bold text, headings |
| Black text on #40B4DA | 8.75:1 | AAA | Lc 57.1 | Large or bold text, headings |
| #40B4DA text on white | 2.39:1 | Fails | Lc 46.9 | Large or bold text, headings |
| #40B4DA text on black | 8.75:1 | AAA | Lc -55.1 | 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
#BEDFED
oklch(88.4% 0.04 225.4)
-
Step 300
300
#8DCBE3
oklch(80.8% 0.072 224.1)
-
Step 400
400 (this color)
#40B4DA
oklch(72.1% 0.115 223.9)
-
Step 500
500
#0098BE
oklch(63.1% 0.118 223.7)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#002B39
oklch(26.9% 0.051 225.5)
#40B4DA 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) | #9FB0DC | 0.091 |
| Deuteranopia (no green cones) | #89A1DA | 0.079 |
| Tritanopia (no blue cones) | #00C0C0 | 0.062 |
| Achromatopsia (no color) | #A7A7A7 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B4DA
#40B4DA
oklch(72.1% 0.115 223.9)
- #E18C68
#E18C68
oklch(72.1% 0.115 43.5)
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 #40B4DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.040
- Deep Sky Blue #00BFFF ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.062
- Greyblue #77A1B5 ΔE 0.071
- Bright Sky Blue #02CCFE ΔE 0.072
- Light Sea Green #20B2AA ΔE 0.075
- Topaz #13BBAF ΔE 0.077
- Dark Turquoise #00CED1 ΔE 0.079
Use #40B4DA 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.