#3F63ED
Closest named color: Neon Blue (#4361EE). oklch(55.7% 0.212 267.7), rgb(63, 99, 237).
Aa
White text reads best on this color (4.97:1).
About this color
#3F63ED is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.212 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.006 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.212) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.21:1 |
| White text | 4.97:1 |
Values
| HEX | #3F63ED |
| RGB | rgb(63, 99, 237) |
| HSL | hsl(228, 83%, 59%) |
| OKLCH | oklch(55.7% 0.212 267.7) |
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 #3F63ED | 4.97:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #3F63ED | 4.21:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #3F63ED text on white | 4.97:1 | AA | Lc 73.9 | Content text, not long reading |
| #3F63ED text on black | 4.21:1 | AA large text | Lc -27.8 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FD
oklch(88.6% 0.052 267.4)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#577EFD
oklch(63.1% 0.194 267.7)
-
Step 600
600 (this color)
#3F63ED
oklch(55.7% 0.212 267.7)
-
Step 700
700
#3251CE
oklch(49.2% 0.196 267.7)
-
Step 800
800
#2943A6
oklch(42.7% 0.162 267.6)
-
Step 900
900
#253A84
oklch(37.7% 0.127 267.9)
-
Step 950
950
#15234D
oklch(27% 0.08 267.1)
#3F63ED 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) | #0078F2 | 0.053 |
| Deuteranopia (no green cones) | #0068EA | 0.033 |
| Tritanopia (no blue cones) | #00869E | 0.169 |
| Achromatopsia (no color) | #707070 | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F63ED
#3F63ED
oklch(55.7% 0.212 267.7)
- #906E00
#906E00
oklch(55.7% 0.114 87.1)
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 #3F63ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.006
- Royal Blue #4169E1 ΔE 0.024
- Azul #1D5DEC ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.035
- Bright Blue #0165FC ΔE 0.038
- Warm Blue #4B57DB ΔE 0.038
- Clear Blue #247AFD ΔE 0.057
- Electric Blue #0652FF ΔE 0.061
Use #3F63ED 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.