#40B8FF
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.7% 0.146 239.5), rgb(64, 184, 255).
Aa
Black text reads best on this color (9.51:1).
About this color
#40B8FF is a medium-light, vivid blue. In OKLCH its lightness is 75%, its chroma 0.146 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.023 away. Black text reads best on it, at 9.51:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.51:1 |
| White text | 2.20:1 |
Values
| HEX | #40B8FF |
| RGB | rgb(64, 184, 255) |
| HSL | hsl(202, 100%, 63%) |
| OKLCH | oklch(74.7% 0.146 239.5) |
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 #40B8FF | 2.20:1 | Fails | Lc -47.8 | Large or bold text, headings |
| Black text on #40B8FF | 9.51:1 | AAA | Lc 60.9 | Content text, not long reading |
| #40B8FF text on white | 2.20:1 | Fails | Lc 43.0 | Non-text elements, placeholder text |
| #40B8FF text on black | 9.51:1 | AAA | Lc -59.1 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BCDEF8
oklch(88.4% 0.051 241.1)
-
Step 300
300
#88C9F6
oklch(80.9% 0.092 239.6)
-
Step 400
400 (this color)
#40B8FF
oklch(74.7% 0.146 239.5)
-
Step 500
500
#0093D6
oklch(63.1% 0.143 239.3)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006899
oklch(49.2% 0.111 239.3)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#40B8FF 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) | #97B8FF | 0.077 |
| Deuteranopia (no green cones) | #7DA7FE | 0.062 |
| Tritanopia (no blue cones) | #00CAD1 | 0.097 |
| Achromatopsia (no color) | #AEAEAE | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B8FF
#40B8FF
oklch(74.7% 0.146 239.5)
- #F09441
#F09441
oklch(74.8% 0.146 59.3)
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 #40B8FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.023
- Bright Sky Blue #02CCFE ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.058
- Carolina Blue #8AB8FE ΔE 0.062
- Lightblue #7BC8F6 ΔE 0.070
- Sky #82CAFC ΔE 0.077
- Light Sky Blue #87CEFA ΔE 0.090
- Cornflower Blue #6495ED ΔE 0.091
Use #40B8FF 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.