#40AAEF
Closest named color: Deep Sky Blue (#00BFFF). oklch(70.8% 0.139 241.5), rgb(64, 170, 239).
Aa
Black text reads best on this color (8.21:1).
About this color
#40AAEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.139 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.056 away. Black text reads best on it, at 8.21:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.21:1 |
| White text | 2.55:1 |
Values
| HEX | #40AAEF |
| RGB | rgb(64, 170, 239) |
| HSL | hsl(204, 85%, 59%) |
| OKLCH | oklch(70.8% 0.139 241.5) |
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 #40AAEF | 2.55:1 | Fails | Lc -54.8 | Large or bold text, headings |
| Black text on #40AAEF | 8.21:1 | AAA | Lc 54.3 | Large or bold text, headings |
| #40AAEF text on white | 2.55:1 | Fails | Lc 49.7 | Large or bold text, headings |
| #40AAEF text on black | 8.21:1 | AAA | Lc -52.3 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BEDEF7
oklch(88.5% 0.048 241.7)
-
Step 300
300
#8EC8F4
oklch(80.9% 0.087 241.8)
-
Step 400
400 (this color)
#40AAEF
oklch(70.8% 0.139 241.5)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#40AAEF 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) | #8AABF2 | 0.069 |
| Deuteranopia (no green cones) | #729BEE | 0.053 |
| Tritanopia (no blue cones) | #00BBC2 | 0.096 |
| Achromatopsia (no color) | #A2A2A2 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40AAEF
#40AAEF
oklch(70.8% 0.139 241.5)
- #DE8A38
#DE8A38
oklch(70.7% 0.139 61.1)
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 #40AAEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.075
- Turquoise Blue #06B1C4 ΔE 0.077
- Dodger Blue #1E90FF ΔE 0.083
- Carolina Blue #8AB8FE ΔE 0.083
- Vivid Sky Blue #4CC9F0 ΔE 0.088
Use #40AAEF 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.