#3F6CDF
Closest named color: Royal Blue (#4169E1). oklch(56.3% 0.183 265), rgb(63, 108, 223).
Aa
White text reads best on this color (4.74:1).
About this color
#3F6CDF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.183 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.008 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #3F6CDF |
| RGB | rgb(63, 108, 223) |
| HSL | hsl(223, 71%, 56%) |
| OKLCH | oklch(56.3% 0.183 265) |
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 #3F6CDF | 4.74:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #3F6CDF | 4.42:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #3F6CDF text on white | 4.74:1 | AA | Lc 72.5 | Content text, not long reading |
| #3F6CDF text on black | 4.42:1 | AA large text | Lc -29.2 | 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
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CAD9F8
oklch(88.4% 0.046 264.9)
-
Step 300
300
#A7C0F7
oklch(80.9% 0.083 265.6)
-
Step 400
400
#789EF3
oklch(70.8% 0.132 264.9)
-
Step 500
500
#5683EE
oklch(63.1% 0.168 264.8)
-
Step 600
600 (this color)
#3F6CDF
oklch(56.3% 0.183 265)
-
Step 700
700
#3057BF
oklch(49% 0.169 265.1)
-
Step 800
800
#28489B
oklch(42.7% 0.141 265)
-
Step 900
900
#243D7B
oklch(37.6% 0.11 265)
-
Step 950
950
#152448
oklch(26.9% 0.07 265)
#3F6CDF 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) | #207BE3 | 0.039 |
| Deuteranopia (no green cones) | #006CDD | 0.033 |
| Tritanopia (no blue cones) | #00889B | 0.147 |
| Achromatopsia (no color) | #737373 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6CDF
#3F6CDF
oklch(56.3% 0.183 265)
- #946F00
#946F00
oklch(56.3% 0.115 85.4)
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 #3F6CDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.008
- Neon Blue #4361EE ΔE 0.035
- Cerulean Blue #056EEE ΔE 0.036
- Warm Blue #4B57DB ΔE 0.049
- Azul #1D5DEC ΔE 0.052
- Clear Blue #247AFD ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Bright Blue #0165FC ΔE 0.058
Use #3F6CDF 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.