#40B4FF
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.8% 0.149 241.7), rgb(64, 180, 255).
Aa
Black text reads best on this color (9.19:1).
About this color
#40B4FF is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.149 and its hue 242°. 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 9.19:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #40B4FF |
| RGB | rgb(64, 180, 255) |
| HSL | hsl(204, 100%, 63%) |
| OKLCH | oklch(73.8% 0.149 241.7) |
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 #40B4FF | 2.28:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #40B4FF | 9.19:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #40B4FF text on white | 2.28:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #40B4FF text on black | 9.19:1 | AAA | Lc -57.5 | 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
#DBEDFB
oklch(93.7% 0.027 241.2)
-
Step 200
200
#BCDEF9
oklch(88.5% 0.052 242.2)
-
Step 300
300
#89C8F8
oklch(80.8% 0.094 242.2)
-
Step 400
400 (this color)
#40B4FF
oklch(73.8% 0.149 241.7)
-
Step 500
500
#0092DB
oklch(63.2% 0.149 241.7)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#40B4FF 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) | #91B5FF | 0.072 |
| Deuteranopia (no green cones) | #77A3FE | 0.058 |
| Tritanopia (no blue cones) | #00C7CE | 0.103 |
| Achromatopsia (no color) | #ABABAB | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B4FF
#40B4FF
oklch(73.8% 0.149 241.7)
- #EC9236
#EC9236
oklch(73.8% 0.149 61.7)
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 #40B4FF, 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
- Carolina Blue #8AB8FE ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.066
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Lightblue #7BC8F6 ΔE 0.079
- Cornflower Blue #6495ED ΔE 0.081
- Chefchaouen Blue #4895EF ΔE 0.082
- Sky #82CAFC ΔE 0.086
Use #40B4FF 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.