#3F63EB
Closest named color: Neon Blue (#4361EE). oklch(55.5% 0.209 267.6), rgb(63, 99, 235).
Aa
White text reads best on this color (5.00:1).
About this color
#3F63EB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.209 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.007 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.209) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #3F63EB |
| RGB | rgb(63, 99, 235) |
| HSL | hsl(227, 81%, 58%) |
| OKLCH | oklch(55.5% 0.209 267.6) |
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 #3F63EB | 5.00:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #3F63EB | 4.19:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #3F63EB text on white | 5.00:1 | AA | Lc 74.0 | Content text, not long reading |
| #3F63EB text on black | 4.19:1 | AA large text | Lc -27.7 | 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
#A6BFFE
oklch(80.9% 0.094 267.6)
-
Step 400
400
#789BFE
oklch(70.7% 0.15 267.8)
-
Step 500
500
#577EFC
oklch(63.1% 0.192 267.7)
-
Step 600
600 (this color)
#3F63EB
oklch(55.5% 0.209 267.6)
-
Step 700
700
#3251CD
oklch(49.1% 0.195 267.6)
-
Step 800
800
#2943A5
oklch(42.6% 0.161 267.6)
-
Step 900
900
#253A83
oklch(37.7% 0.125 267.8)
-
Step 950
950
#16234D
oklch(27.1% 0.079 267.9)
#3F63EB 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) | #0078F0 | 0.053 |
| Deuteranopia (no green cones) | #0068E8 | 0.033 |
| Tritanopia (no blue cones) | #00859D | 0.166 |
| Achromatopsia (no color) | #6F6F6F | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F63EB
#3F63EB
oklch(55.5% 0.209 267.6)
- #8F6E00
#8F6E00
oklch(55.5% 0.114 87.7)
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 #3F63EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.007
- Royal Blue #4169E1 ΔE 0.022
- Azul #1D5DEC ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.035
- Warm Blue #4B57DB ΔE 0.036
- Bright Blue #0165FC ΔE 0.040
- Clear Blue #247AFD ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.061
Use #3F63EB 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.