#3F63D0
Closest named color: Royal Blue (#4169E1). oklch(53.4% 0.173 266.7), rgb(63, 99, 208).
Aa
White text reads best on this color (5.37:1).
About this color
#3F63D0 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.173 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.030 away. White text reads best on it, at 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #3F63D0 |
| RGB | rgb(63, 99, 208) |
| HSL | hsl(225, 61%, 53%) |
| OKLCH | oklch(53.4% 0.173 266.7) |
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 #3F63D0 | 5.37:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #3F63D0 | 3.90:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #3F63D0 text on white | 5.37:1 | AA | Lc 76.4 | Fine for body text |
| #3F63D0 text on black | 3.90:1 | AA large text | Lc -25.4 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AAC0F4
oklch(80.9% 0.078 266.8)
-
Step 400
400
#7D9DEF
oklch(70.6% 0.126 267)
-
Step 500
500
#5D83E9
oklch(63.1% 0.159 266.5)
-
Step 600
600 (this color)
#3F63D0
oklch(53.4% 0.173 266.7)
-
Step 700
700
#3757BB
oklch(49.1% 0.162 266.9)
-
Step 800
800
#2D4897
oklch(42.7% 0.134 266.5)
-
Step 900
900
#283D78
oklch(37.6% 0.104 266.7)
-
Step 950
950
#182446
oklch(26.9% 0.065 267.3)
#3F63D0 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) | #1971D4 | 0.039 |
| Deuteranopia (no green cones) | #0064CE | 0.036 |
| Tritanopia (no blue cones) | #007D90 | 0.140 |
| Achromatopsia (no color) | #6A6A6A | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F63D0
#3F63D0
oklch(53.4% 0.173 266.7)
- #896800
#896800
oklch(53.6% 0.11 86.7)
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 #3F63D0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.030
- Warm Blue #4B57DB ΔE 0.035
- Neon Blue #4361EE ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.049
- Iris #6258C4 ΔE 0.051
- Azul #1D5DEC ΔE 0.053
- Mid Blue #276AB3 ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.056
Use #3F63D0 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.