#40A3EB
Closest named color: Chefchaouen Blue (#4895EF). oklch(69% 0.14 244.1), rgb(64, 163, 235).
Aa
Black text reads best on this color (7.65:1).
About this color
#40A3EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.140 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.039 away. Black text reads best on it, at 7.65:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.65:1 |
| White text | 2.74:1 |
Values
| HEX | #40A3EB |
| RGB | rgb(64, 163, 235) |
| HSL | hsl(205, 81%, 59%) |
| OKLCH | oklch(69% 0.14 244.1) |
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 #40A3EB | 2.74:1 | Fails | Lc -57.9 | Large or bold text, headings |
| Black text on #40A3EB | 7.65:1 | AAA | Lc 51.4 | Large or bold text, headings |
| #40A3EB text on white | 2.74:1 | Fails | Lc 52.7 | Large or bold text, headings |
| #40A3EB text on black | 7.65:1 | AAA | Lc -49.2 | 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
#BFDDF8
oklch(88.4% 0.049 245.6)
-
Step 300
300
#90C7F5
oklch(80.8% 0.087 244.4)
-
Step 400
400 (this color)
#40A3EB
oklch(69% 0.14 244.1)
-
Step 500
500
#0090E0
oklch(63% 0.157 244.4)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#40A3EB 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) | #82A5EE | 0.062 |
| Deuteranopia (no green cones) | #6A95EA | 0.047 |
| Tritanopia (no blue cones) | #00B5BD | 0.099 |
| Achromatopsia (no color) | #9C9C9C | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40A3EB
#40A3EB
oklch(69% 0.14 244.1)
- #D6862B
#D6862B
oklch(68.9% 0.14 64.1)
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 #40A3EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.068
- Soft Blue #6488EA ΔE 0.074
- Deep Sky Blue #00BFFF ΔE 0.074
- Turquoise Blue #06B1C4 ΔE 0.082
- Faded Blue #658CBB ΔE 0.084
Use #40A3EB 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.