#3F71C8
Closest named color: Windows Blue (#3778BF). oklch(55.8% 0.146 260.7), rgb(63, 113, 200).
Aa
White text reads best on this color (4.76:1).
About this color
#3F71C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.146 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.026 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #3F71C8 |
| RGB | rgb(63, 113, 200) |
| HSL | hsl(218, 55%, 52%) |
| OKLCH | oklch(55.8% 0.146 260.7) |
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 #3F71C8 | 4.76:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #3F71C8 | 4.40:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #3F71C8 text on white | 4.76:1 | AA | Lc 72.8 | Content text, not long reading |
| #3F71C8 text on black | 4.40:1 | AA large text | Lc -28.9 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#A9C2EC
oklch(81% 0.066 260.7)
-
Step 400
400
#7BA1E2
oklch(70.7% 0.105 260.8)
-
Step 500
500
#5988DA
oklch(63.1% 0.134 260.9)
-
Step 600
600 (this color)
#3F71C8
oklch(55.8% 0.146 260.7)
-
Step 700
700
#305EAC
oklch(49.1% 0.135 260.3)
-
Step 800
800
#294D8B
oklch(42.7% 0.111 260.5)
-
Step 900
900
#25406F
oklch(37.5% 0.087 260.7)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#3F71C8 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) | #4779CB | 0.024 |
| Deuteranopia (no green cones) | #2F6DC6 | 0.019 |
| Tritanopia (no blue cones) | #008593 | 0.117 |
| Achromatopsia (no color) | #737373 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F71C8
#3F71C8
oklch(55.8% 0.146 260.7)
- #966B00
#966B00
oklch(55.7% 0.115 80.8)
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 #3F71C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.026
- French Blue #436BAD ΔE 0.042
- Mid Blue #276AB3 ΔE 0.044
- Royal Blue #4169E1 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.056
- Water Blue #0E87CC ΔE 0.060
- Steel Blue #4682B4 ΔE 0.063
Use #3F71C8 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.