#4FBBFF
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.8% 0.139 240), rgb(79, 187, 255).
Aa
Black text reads best on this color (9.88:1).
About this color
#4FBBFF is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, 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 0.026 away. Black text reads best on it, at 9.88:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.88:1 |
| White text | 2.12:1 |
Values
| HEX | #4FBBFF |
| RGB | rgb(79, 187, 255) |
| HSL | hsl(203, 100%, 65%) |
| OKLCH | oklch(75.8% 0.139 240) |
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 #4FBBFF | 2.12:1 | Fails | Lc -46.0 | Large or bold text, headings |
| Black text on #4FBBFF | 9.88:1 | AAA | Lc 62.6 | Content text, not long reading |
| #4FBBFF text on white | 2.12:1 | Fails | Lc 41.3 | Non-text elements, placeholder text |
| #4FBBFF text on black | 9.88:1 | AAA | Lc -60.9 | Content text, not long reading |
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 300.
-
Step 50
50
#EDF7FF
oklch(97.1% 0.015 241.8)
-
Step 100
100
#D6EEFF
oklch(93.7% 0.034 238.7)
-
Step 200
200
#B4E0FF
oklch(88.6% 0.063 239.1)
-
Step 300
300 (this color)
#4FBBFF
oklch(75.8% 0.139 240)
-
Step 400
400
#00ABFA
oklch(70.7% 0.162 240)
-
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)
#4FBBFF 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) | #9BBBFF | 0.072 |
| Deuteranopia (no green cones) | #83AAFE | 0.059 |
| Tritanopia (no blue cones) | #00CCD2 | 0.096 |
| Achromatopsia (no color) | #B2B2B2 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4FBBFF
#4FBBFF
oklch(75.8% 0.139 240)
- #F0994C
#F0994C
oklch(75.7% 0.139 59.6)
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 #4FBBFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.026
- Bright Sky Blue #02CCFE ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.049
- Carolina Blue #8AB8FE ΔE 0.052
- Lightblue #7BC8F6 ΔE 0.057
- Sky #82CAFC ΔE 0.064
- Light Sky Blue #87CEFA ΔE 0.077
- Pastel Blue #A2BFFE ΔE 0.082
Use #4FBBFF 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.