#3F68CC
Closest named color: Royal Blue (#4169E1). oklch(54.2% 0.162 264.8), rgb(63, 104, 204).
Aa
White text reads best on this color (5.16:1).
About this color
#3F68CC is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.162 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. White text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #3F68CC |
| RGB | rgb(63, 104, 204) |
| HSL | hsl(223, 58%, 52%) |
| OKLCH | oklch(54.2% 0.162 264.8) |
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 #3F68CC | 5.16:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #3F68CC | 4.06:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #3F68CC text on white | 5.16:1 | AA | Lc 75.2 | Fine for body text |
| #3F68CC text on black | 4.06:1 | AA large text | Lc -26.5 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC1F1
oklch(81% 0.073 264.8)
-
Step 400
400
#7C9FE9
oklch(70.7% 0.116 264.3)
-
Step 500
500
#5C85E3
oklch(63.1% 0.149 264.7)
-
Step 600
600 (this color)
#3F68CC
oklch(54.2% 0.162 264.8)
-
Step 700
700
#355AB5
oklch(49.1% 0.151 264.8)
-
Step 800
800
#2C4A92
oklch(42.7% 0.124 264.7)
-
Step 900
900
#273E75
oklch(37.6% 0.098 265)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#3F68CC 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) | #3074D0 | 0.031 |
| Deuteranopia (no green cones) | #0067CA | 0.036 |
| Tritanopia (no blue cones) | #008090 | 0.132 |
| Achromatopsia (no color) | #6D6D6D | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F68CC
#3F68CC
oklch(54.2% 0.162 264.8)
- #8D6900
#8D6900
oklch(54.3% 0.111 84.8)
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 #3F68CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.046
- Warm Blue #4B57DB ΔE 0.049
- Windows Blue #3778BF ΔE 0.050
- French Blue #436BAD ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.052
- Iris #6258C4 ΔE 0.055
- Neon Blue #4361EE ΔE 0.056
Use #3F68CC 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.