#40B8EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.8% 0.127 230.6), rgb(64, 184, 235).
Aa
Black text reads best on this color (9.27:1).
About this color
#40B8EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.127 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.032 away. Black text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.27:1 |
| White text | 2.26:1 |
Values
| HEX | #40B8EB |
| RGB | rgb(64, 184, 235) |
| HSL | hsl(198, 81%, 59%) |
| OKLCH | oklch(73.8% 0.127 230.6) |
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 #40B8EB | 2.26:1 | Fails | Lc -49.1 | Large or bold text, headings |
| Black text on #40B8EB | 9.27:1 | AAA | Lc 59.7 | Large or bold text, headings |
| #40B8EB text on white | 2.26:1 | Fails | Lc 44.3 | Non-text elements, placeholder text |
| #40B8EB text on black | 9.27:1 | AAA | Lc -57.9 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DBEDF7
oklch(93.6% 0.023 231.8)
-
Step 200
200
#BDDFF1
oklch(88.5% 0.044 231)
-
Step 300
300
#8ACBEB
oklch(81% 0.08 230.3)
-
Step 400
400 (this color)
#40B8EB
oklch(73.8% 0.127 230.6)
-
Step 500
500
#0096C7
oklch(63.1% 0.126 230.5)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#40B8EB 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) | #9EB6ED | 0.087 |
| Deuteranopia (no green cones) | #87A5EA | 0.074 |
| Tritanopia (no blue cones) | #00C6C9 | 0.075 |
| Achromatopsia (no color) | #ACACAC | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B8EB
#40B8EB
oklch(73.8% 0.127 230.6)
- #E9915C
#E9915C
oklch(73.7% 0.127 50.8)
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 #40B8EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.032
- Vivid Sky Blue #4CC9F0 ΔE 0.048
- Bright Sky Blue #02CCFE ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.064
- Lightblue #7BC8F6 ΔE 0.069
- Carolina Blue #8AB8FE ΔE 0.071
- Sky #82CAFC ΔE 0.079
- Dark Turquoise #00CED1 ΔE 0.083
Use #40B8EB 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.