#40AFEF
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.9% 0.136 238.4), rgb(64, 175, 239).
Aa
Black text reads best on this color (8.59:1).
About this color
#40AFEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.136 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.044 away. Black text reads best on it, at 8.59:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.59:1 |
| White text | 2.44:1 |
Values
| HEX | #40AFEF |
| RGB | rgb(64, 175, 239) |
| HSL | hsl(202, 85%, 59%) |
| OKLCH | oklch(71.9% 0.136 238.4) |
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 #40AFEF | 2.44:1 | Fails | Lc -52.7 | Large or bold text, headings |
| Black text on #40AFEF | 8.59:1 | AAA | Lc 56.3 | Large or bold text, headings |
| #40AFEF text on white | 2.44:1 | Fails | Lc 47.7 | Large or bold text, headings |
| #40AFEF text on black | 8.59:1 | AAA | Lc -54.3 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCEDF9
oklch(93.7% 0.024 238.4)
-
Step 200
200
#BDDEF5
oklch(88.4% 0.047 238.5)
-
Step 300
300
#8CC9F1
oklch(80.9% 0.084 237.9)
-
Step 400
400 (this color)
#40AFEF
oklch(71.9% 0.136 238.4)
-
Step 500
500
#0093D4
oklch(63% 0.141 238.5)
-
Step 600
600
#007CB3
oklch(55.7% 0.124 238.2)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#004769
oklch(37.8% 0.084 238.3)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#40AFEF 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) | #91AFF2 | 0.075 |
| Deuteranopia (no green cones) | #799EEE | 0.061 |
| Tritanopia (no blue cones) | #00BFC5 | 0.090 |
| Achromatopsia (no color) | #A6A6A6 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40AFEF
#40AFEF
oklch(71.9% 0.136 238.4)
- #E28D44
#E28D44
oklch(71.9% 0.135 58.6)
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 #40AFEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.071
- Cornflower Blue #6495ED ΔE 0.071
- Turquoise Blue #06B1C4 ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.074
- Carolina Blue #8AB8FE ΔE 0.076
- Bright Sky Blue #02CCFE ΔE 0.076
- Lightblue #7BC8F6 ΔE 0.088
Use #40AFEF 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.