#40B3F1
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.9% 0.135 236.8), rgb(64, 179, 241).
Aa
Black text reads best on this color (8.93:1).
About this color
#40B3F1 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.135 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.034 away. Black text reads best on it, at 8.93:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.93:1 |
| White text | 2.34:1 |
Values
| HEX | #40B3F1 |
| RGB | rgb(64, 179, 241) |
| HSL | hsl(201, 86%, 60%) |
| OKLCH | oklch(72.9% 0.135 236.8) |
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 #40B3F1 | 2.34:1 | Fails | Lc -50.9 | Large or bold text, headings |
| Black text on #40B3F1 | 8.93:1 | AAA | Lc 58.0 | Large or bold text, headings |
| #40B3F1 text on white | 2.34:1 | Fails | Lc 46.0 | Large or bold text, headings |
| #40B3F1 text on black | 8.93:1 | AAA | Lc -56.1 | 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
#DBEDF8
oklch(93.6% 0.024 234.4)
-
Step 200
200
#BDDFF5
oklch(88.6% 0.047 236.5)
-
Step 300
300
#8BC9F1
oklch(80.8% 0.085 237.5)
-
Step 400
400 (this color)
#40B3F1
oklch(72.9% 0.135 236.8)
-
Step 500
500
#0094D1
oklch(63.1% 0.137 236.6)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#40B3F1 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) | #95B2F4 | 0.078 |
| Deuteranopia (no green cones) | #7DA2F0 | 0.063 |
| Tritanopia (no blue cones) | #00C3C8 | 0.088 |
| Achromatopsia (no color) | #A9A9A9 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B3F1
#40B3F1
oklch(72.9% 0.135 236.8)
- #E78F4A
#E78F4A
oklch(72.9% 0.136 56.5)
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 #40B3F1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.034
- Vivid Sky Blue #4CC9F0 ΔE 0.064
- Bright Sky Blue #02CCFE ΔE 0.066
- Carolina Blue #8AB8FE ΔE 0.071
- Turquoise Blue #06B1C4 ΔE 0.072
- Lightblue #7BC8F6 ΔE 0.079
- Cornflower Blue #6495ED ΔE 0.080
- Chefchaouen Blue #4895EF ΔE 0.081
Use #40B3F1 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.