#3F71D1
Closest named color: Royal Blue (#4169E1). oklch(56.4% 0.158 262), rgb(63, 113, 209).
Aa
White text reads best on this color (4.67:1).
About this color
#3F71D1 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.158 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.033 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #3F71D1 |
| RGB | rgb(63, 113, 209) |
| HSL | hsl(219, 61%, 53%) |
| OKLCH | oklch(56.4% 0.158 262) |
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 #3F71D1 | 4.67:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #3F71D1 | 4.49:1 | AA large text | Lc 32.0 | Non-text elements, placeholder text |
| #3F71D1 text on white | 4.67:1 | AA | Lc 72.1 | Content text, not long reading |
| #3F71D1 text on black | 4.49:1 | AA large text | Lc -29.6 | 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A8C1EF
oklch(80.8% 0.071 262.5)
-
Step 400
400
#79A0E8
oklch(70.7% 0.115 262.1)
-
Step 500
500
#5787E0
oklch(63.1% 0.144 261.7)
-
Step 600
600 (this color)
#3F71D1
oklch(56.4% 0.158 262)
-
Step 700
700
#2F5CB3
oklch(49.2% 0.147 262)
-
Step 800
800
#284B91
oklch(42.6% 0.123 262.4)
-
Step 900
900
#244073
oklch(37.8% 0.094 261.4)
-
Step 950
950
#162644
oklch(27.2% 0.06 262)
#3F71D1 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) | #407BD5 | 0.027 |
| Deuteranopia (no green cones) | #216ECF | 0.025 |
| Tritanopia (no blue cones) | #008797 | 0.126 |
| Achromatopsia (no color) | #747474 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F71D1
#3F71D1
oklch(56.4% 0.158 262)
- #976D00
#976D00
oklch(56.3% 0.116 81.8)
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 #3F71D1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.033
- Windows Blue #3778BF ΔE 0.037
- Cerulean Blue #056EEE ΔE 0.054
- Mid Blue #276AB3 ΔE 0.055
- French Blue #436BAD ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.060
- Neon Blue #4361EE ΔE 0.061
- Water Blue #0E87CC ΔE 0.063
Use #3F71D1 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.