#3F64BA
Closest named color: Mid Blue (#276AB3). oklch(52.1% 0.142 264.5), rgb(63, 100, 186).
Aa
White text reads best on this color (5.61:1).
About this color
#3F64BA is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.142 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.028 away. White text reads best on it, at 5.61:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.74:1 |
| White text | 5.61:1 |
Values
| HEX | #3F64BA |
| RGB | rgb(63, 100, 186) |
| HSL | hsl(222, 49%, 49%) |
| OKLCH | oklch(52.1% 0.142 264.5) |
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 #3F64BA | 5.61:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #3F64BA | 3.74:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #3F64BA text on white | 5.61:1 | AA | Lc 77.8 | Fine for body text |
| #3F64BA text on black | 3.74:1 | AA large text | Lc -24.0 | 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 700.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1EE
oklch(81% 0.068 264.5)
-
Step 400
400
#7E9FE5
oklch(70.6% 0.11 264.5)
-
Step 500
500
#5E86DE
oklch(63.1% 0.14 264.3)
-
Step 600
600
#456ECC
oklch(55.7% 0.153 264.3)
-
Step 700
700 (this color)
#3F64BA
oklch(52.1% 0.142 264.5)
-
Step 800
800
#2E4B8F
oklch(42.8% 0.118 264.6)
-
Step 900
900
#293F72
oklch(37.7% 0.092 264.8)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#3F64BA 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) | #396EBD | 0.026 |
| Deuteranopia (no green cones) | #2262B8 | 0.026 |
| Tritanopia (no blue cones) | #007886 | 0.117 |
| Achromatopsia (no color) | #686868 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F64BA
#3F64BA
oklch(52.1% 0.142 264.5)
- #866300
#866300
oklch(52.1% 0.107 84.3)
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 #3F64BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.028
- French Blue #436BAD ΔE 0.031
- Windows Blue #3778BF ΔE 0.054
- Iris #6258C4 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.060
- Royal Blue #4169E1 ΔE 0.061
- Muted Blue #3B719F ΔE 0.062
Use #3F64BA 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.