#40A3CF
Closest named color: Turquoise Blue (#06B1C4). oklch(67.6% 0.111 231), rgb(64, 163, 207).
Aa
Black text reads best on this color (7.35:1).
About this color
#40A3CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.111 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.050 away. Black text reads best on it, at 7.35:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.35:1 |
| White text | 2.85:1 |
Values
| HEX | #40A3CF |
| RGB | rgb(64, 163, 207) |
| HSL | hsl(198, 60%, 53%) |
| OKLCH | oklch(67.6% 0.111 231) |
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 #40A3CF | 2.85:1 | Fails | Lc -59.7 | Large or bold text, headings |
| Black text on #40A3CF | 7.35:1 | AAA | Lc 49.7 | Large or bold text, headings |
| #40A3CF text on white | 2.85:1 | Fails | Lc 54.4 | Large or bold text, headings |
| #40A3CF text on black | 7.35:1 | AAA | Lc -47.5 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDEDF5
oklch(93.7% 0.02 229)
-
Step 200
200
#C0DEEE
oklch(88.4% 0.039 231.1)
-
Step 300
300
#92C9E6
oklch(80.8% 0.07 231.7)
-
Step 400
400 (this color)
#40A3CF
oklch(67.6% 0.111 231)
-
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)
#40A3CF 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) | #8DA1D1 | 0.076 |
| Deuteranopia (no green cones) | #7993CE | 0.064 |
| Tritanopia (no blue cones) | #00AFB2 | 0.067 |
| Achromatopsia (no color) | #999999 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40A3CF
#40A3CF
oklch(67.6% 0.111 231)
- #CD8255
#CD8255
oklch(67.6% 0.111 50.9)
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 #40A3CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.050
- Greyblue #77A1B5 ΔE 0.058
- Faded Blue #658CBB ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.069
- Cadet Blue #5F9EA0 ΔE 0.069
- Cornflower Blue #6495ED ΔE 0.072
- Dark Sky Blue #448EE4 ΔE 0.073
- Bluegrey #85A3B2 ΔE 0.075
Use #40A3CF 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.