#4BB9FD
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.2% 0.139 239.7), rgb(75, 185, 253).
Aa
Black text reads best on this color (9.65:1).
About this color
#4BB9FD is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.139 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.025 away. Black text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.65:1 |
| White text | 2.17:1 |
Values
| HEX | #4BB9FD |
| RGB | rgb(75, 185, 253) |
| HSL | hsl(203, 98%, 64%) |
| OKLCH | oklch(75.2% 0.139 239.7) |
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 #4BB9FD | 2.17:1 | Fails | Lc -47.1 | Large or bold text, headings |
| Black text on #4BB9FD | 9.65:1 | AAA | Lc 61.5 | Content text, not long reading |
| #4BB9FD text on white | 2.17:1 | Fails | Lc 42.4 | Non-text elements, placeholder text |
| #4BB9FD text on black | 9.65:1 | AAA | Lc -59.8 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBEDF9
oklch(93.6% 0.025 236.8)
-
Step 200
200
#BDDEF6
oklch(88.4% 0.048 239.7)
-
Step 300
300
#8CC9F3
oklch(81% 0.086 239.3)
-
Step 400
400 (this color)
#4BB9FD
oklch(75.2% 0.139 239.7)
-
Step 500
500
#0093D7
oklch(63.2% 0.144 239.7)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
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)
#4BB9FD 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) | #99B9FF | 0.073 |
| Deuteranopia (no green cones) | #81A8FC | 0.060 |
| Tritanopia (no blue cones) | #00CAD1 | 0.094 |
| Achromatopsia (no color) | #B0B0B0 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4BB9FD
#4BB9FD
oklch(75.2% 0.139 239.7)
- #EE9749
#EE9749
oklch(75.1% 0.139 59.8)
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 #4BB9FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.025
- Bright Sky Blue #02CCFE ΔE 0.053
- Vivid Sky Blue #4CC9F0 ΔE 0.053
- Carolina Blue #8AB8FE ΔE 0.055
- Lightblue #7BC8F6 ΔE 0.063
- Sky #82CAFC ΔE 0.070
- Light Sky Blue #87CEFA ΔE 0.083
- Pastel Blue #A2BFFE ΔE 0.087
Use #4BB9FD 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.