#4FB9FC
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.2% 0.137 240), rgb(79, 185, 252).
Aa
Black text reads best on this color (9.67:1).
About this color
#4FB9FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.137 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.027 away. Black text reads best on it, at 9.67:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.67:1 |
| White text | 2.16:1 |
Values
| HEX | #4FB9FC |
| RGB | rgb(79, 185, 252) |
| HSL | hsl(203, 97%, 65%) |
| OKLCH | oklch(75.2% 0.137 240) |
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 #4FB9FC | 2.16:1 | Fails | Lc -47.0 | Large or bold text, headings |
| Black text on #4FB9FC | 9.67:1 | AAA | Lc 61.6 | Content text, not long reading |
| #4FB9FC text on white | 2.16:1 | Fails | Lc 42.3 | Non-text elements, placeholder text |
| #4FB9FC text on black | 9.67:1 | AAA | Lc -59.9 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCEDF9
oklch(93.7% 0.024 238.4)
-
Step 200
200
#BEDEF6
oklch(88.5% 0.047 240.5)
-
Step 300
300
#8DC9F3
oklch(81% 0.086 239.7)
-
Step 400
400 (this color)
#4FB9FC
oklch(75.2% 0.137 240)
-
Step 500
500
#0093D7
oklch(63.2% 0.144 239.7)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557F
oklch(42.8% 0.098 239.8)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#4FB9FC 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) | #9AB9FF | 0.072 |
| Deuteranopia (no green cones) | #82A9FB | 0.057 |
| Tritanopia (no blue cones) | #00CAD0 | 0.095 |
| Achromatopsia (no color) | #B0B0B0 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4FB9FC
#4FB9FC
oklch(75.2% 0.137 240)
- #ED984C
#ED984C
oklch(75.2% 0.137 60)
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 #4FB9FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.027
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Bright Sky Blue #02CCFE ΔE 0.053
- Carolina Blue #8AB8FE ΔE 0.053
- Lightblue #7BC8F6 ΔE 0.060
- Sky #82CAFC ΔE 0.068
- Light Sky Blue #87CEFA ΔE 0.081
- Pastel Blue #A2BFFE ΔE 0.084
Use #4FB9FC 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.