#3F6BC9
Closest named color: Royal Blue (#4169E1). oklch(54.6% 0.154 263.3), rgb(63, 107, 201).
Aa
White text reads best on this color (5.05:1).
About this color
#3F6BC9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.154 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.038 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #3F6BC9 |
| RGB | rgb(63, 107, 201) |
| HSL | hsl(221, 56%, 52%) |
| OKLCH | oklch(54.6% 0.154 263.3) |
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 #3F6BC9 | 5.05:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #3F6BC9 | 4.15:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #3F6BC9 text on white | 5.05:1 | AA | Lc 74.6 | Content text, not long reading |
| #3F6BC9 text on black | 4.15:1 | AA large text | Lc -27.1 | 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
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1EE
oklch(80.8% 0.069 262.9)
-
Step 400
400
#7CA0E6
oklch(70.8% 0.111 263)
-
Step 500
500
#5B86DF
oklch(63% 0.143 263.4)
-
Step 600
600 (this color)
#3F6BC9
oklch(54.6% 0.154 263.3)
-
Step 700
700
#345BB1
oklch(49% 0.144 263.6)
-
Step 800
800
#2B4B8F
oklch(42.6% 0.119 263.3)
-
Step 900
900
#273F72
oklch(37.6% 0.092 263.6)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#3F6BC9 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) | #3A75CD | 0.026 |
| Deuteranopia (no green cones) | #1C69C7 | 0.028 |
| Tritanopia (no blue cones) | #008190 | 0.125 |
| Achromatopsia (no color) | #6F6F6F | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6BC9
#3F6BC9
oklch(54.6% 0.154 263.3)
- #906900
#906900
oklch(54.6% 0.112 82.9)
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 #3F6BC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.038
- Windows Blue #3778BF ΔE 0.041
- Mid Blue #276AB3 ΔE 0.041
- French Blue #436BAD ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.055
- Warm Blue #4B57DB ΔE 0.058
- Iris #6258C4 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.060
Use #3F6BC9 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.