#40ADDD
Closest named color: Turquoise Blue (#06B1C4). oklch(70.6% 0.12 231.1), rgb(64, 173, 221).
Aa
Black text reads best on this color (8.23:1).
About this color
#40ADDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.120 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.048 away. Black text reads best on it, at 8.23:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.23:1 |
| White text | 2.54:1 |
Values
| HEX | #40ADDD |
| RGB | rgb(64, 173, 221) |
| HSL | hsl(198, 70%, 56%) |
| OKLCH | oklch(70.6% 0.12 231.1) |
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 #40ADDD | 2.54:1 | Fails | Lc -54.7 | Large or bold text, headings |
| Black text on #40ADDD | 8.23:1 | AAA | Lc 54.4 | Large or bold text, headings |
| #40ADDD text on white | 2.54:1 | Fails | Lc 49.6 | Large or bold text, headings |
| #40ADDD text on black | 8.23:1 | AAA | Lc -52.4 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DCEDF6
oklch(93.6% 0.022 230.5)
-
Step 200
200
#BFDFF0
oklch(88.6% 0.041 231)
-
Step 300
300
#8ECAE8
oklch(80.9% 0.075 230.5)
-
Step 400
400 (this color)
#40ADDD
oklch(70.6% 0.12 231.1)
-
Step 500
500
#0096C8
oklch(63.1% 0.127 231)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#40ADDD 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) | #95ABDF | 0.081 |
| Deuteranopia (no green cones) | #7F9BDC | 0.069 |
| Tritanopia (no blue cones) | #00BABD | 0.072 |
| Achromatopsia (no color) | #A2A2A2 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40ADDD
#40ADDD
oklch(70.6% 0.12 231.1)
- #DB8958
#DB8958
oklch(70.6% 0.119 50.7)
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 #40ADDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.048
- Deep Sky Blue #00BFFF ΔE 0.060
- Greyblue #77A1B5 ΔE 0.069
- Chefchaouen Blue #4895EF ΔE 0.077
- Cornflower Blue #6495ED ΔE 0.078
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Bluegrey #85A3B2 ΔE 0.080
- Light Sea Green #20B2AA ΔE 0.086
Use #40ADDD 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.