#40B0EA
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.9% 0.13 235.6), rgb(64, 176, 234).
Aa
Black text reads best on this color (8.61:1).
About this color
#40B0EA is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.130 and its hue 236°. 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 8.61:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.61:1 |
| White text | 2.43:1 |
Values
| HEX | #40B0EA |
| RGB | rgb(64, 176, 234) |
| HSL | hsl(200, 80%, 58%) |
| OKLCH | oklch(71.9% 0.13 235.6) |
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 #40B0EA | 2.43:1 | Fails | Lc -52.6 | Large or bold text, headings |
| Black text on #40B0EA | 8.61:1 | AAA | Lc 56.4 | Large or bold text, headings |
| #40B0EA text on white | 2.43:1 | Fails | Lc 47.6 | Large or bold text, headings |
| #40B0EA text on black | 8.61:1 | AAA | Lc -54.4 | 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
#DCEDF8
oklch(93.7% 0.023 236)
-
Step 200
200
#BEDFF3
oklch(88.6% 0.044 234.6)
-
Step 300
300
#8CC9EE
oklch(80.8% 0.082 235.8)
-
Step 400
400 (this color)
#40B0EA
oklch(71.9% 0.13 235.6)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#40B0EA 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) | #94AFED | 0.078 |
| Deuteranopia (no green cones) | #7D9FE9 | 0.065 |
| Tritanopia (no blue cones) | #00BFC4 | 0.083 |
| Achromatopsia (no color) | #A6A6A6 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B0EA
#40B0EA
oklch(71.9% 0.13 235.6)
- #E28D4D
#E28D4D
oklch(72% 0.13 55.7)
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 #40B0EA, 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
- Turquoise Blue #06B1C4 ΔE 0.064
- Vivid Sky Blue #4CC9F0 ΔE 0.070
- Bright Sky Blue #02CCFE ΔE 0.074
- Chefchaouen Blue #4895EF ΔE 0.076
- Cornflower Blue #6495ED ΔE 0.076
- Carolina Blue #8AB8FE ΔE 0.078
- Greyblue #77A1B5 ΔE 0.083
Use #40B0EA 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.