#3FA3FF
Closest named color: Chefchaouen Blue (#4895EF). oklch(70% 0.163 249.9), rgb(63, 163, 255).
Aa
Black text reads best on this color (7.89:1).
About this color
#3FA3FF is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.163 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.040 away. Black text reads best on it, at 7.89:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.89:1 |
| White text | 2.66:1 |
Values
| HEX | #3FA3FF |
| RGB | rgb(63, 163, 255) |
| HSL | hsl(209, 100%, 62%) |
| OKLCH | oklch(70% 0.163 249.9) |
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 #3FA3FF | 2.66:1 | Fails | Lc -56.5 | Large or bold text, headings |
| Black text on #3FA3FF | 7.89:1 | AAA | Lc 52.7 | Large or bold text, headings |
| #3FA3FF text on white | 2.66:1 | Fails | Lc 51.3 | Large or bold text, headings |
| #3FA3FF text on black | 7.89:1 | AAA | Lc -50.6 | 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
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DCECFD
oklch(93.6% 0.029 249.8)
-
Step 200
200
#BDDDFE
oklch(88.5% 0.057 249.3)
-
Step 300
300
#8EC6FF
oklch(80.9% 0.1 249.6)
-
Step 400
400 (this color)
#3FA3FF
oklch(70% 0.163 249.9)
-
Step 500
500
#008CEF
oklch(63% 0.178 249.9)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#3FA3FF 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) | #78A8FF | 0.053 |
| Deuteranopia (no green cones) | #5B97FD | 0.034 |
| Tritanopia (no blue cones) | #00B9C5 | 0.121 |
| Achromatopsia (no color) | #9F9F9F | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FA3FF
#3FA3FF
oklch(70% 0.163 249.9)
- #D98B00
#D98B00
oklch(70% 0.152 70.2)
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 #3FA3FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.045
- Dodger Blue #1E90FF ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.063
- Soft Blue #6488EA ΔE 0.073
- Deep Sky Blue #00BFFF ΔE 0.075
- Periwinkle Blue #8F99FB ΔE 0.078
- Perrywinkle #8F8CE7 ΔE 0.093
Use #3FA3FF 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.