#3F6ACB
Closest named color: Royal Blue (#4169E1). oklch(54.5% 0.158 263.9), rgb(63, 106, 203).
Aa
White text reads best on this color (5.07:1).
About this color
#3F6ACB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.158 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #3F6ACB |
| RGB | rgb(63, 106, 203) |
| HSL | hsl(222, 57%, 52%) |
| OKLCH | oklch(54.5% 0.158 263.9) |
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 #3F6ACB | 5.07:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #3F6ACB | 4.13:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #3F6ACB text on white | 5.07:1 | AA | Lc 74.7 | Content text, not long reading |
| #3F6ACB text on black | 4.13:1 | AA large text | Lc -27.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1EF
oklch(80.9% 0.07 263.3)
-
Step 400
400
#7C9FE8
oklch(70.6% 0.114 264.1)
-
Step 500
500
#5B86E1
oklch(63.2% 0.145 263.7)
-
Step 600
600 (this color)
#3F6ACB
oklch(54.5% 0.158 263.9)
-
Step 700
700
#345BB3
oklch(49.2% 0.147 263.9)
-
Step 800
800
#2B4B91
oklch(42.8% 0.122 263.6)
-
Step 900
900
#273F73
oklch(37.7% 0.094 263.8)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#3F6ACB 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) | #3675CF | 0.029 |
| Deuteranopia (no green cones) | #1268C9 | 0.032 |
| Tritanopia (no blue cones) | #008191 | 0.128 |
| Achromatopsia (no color) | #6E6E6E | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6ACB
#3F6ACB
oklch(54.5% 0.158 263.9)
- #8F6900
#8F6900
oklch(54.5% 0.112 83.5)
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 #3F6ACB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Mid Blue #276AB3 ΔE 0.044
- Windows Blue #3778BF ΔE 0.045
- French Blue #436BAD ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.053
- Warm Blue #4B57DB ΔE 0.054
- Iris #6258C4 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.059
Use #3F6ACB 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.