#3A75D5
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.16 259.7), rgb(58, 117, 213).
Aa
Black text reads best on this color (4.68:1).
About this color
#3A75D5 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.160 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #3A75D5 |
| RGB | rgb(58, 117, 213) |
| HSL | hsl(217, 65%, 53%) |
| OKLCH | oklch(57.3% 0.16 259.7) |
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 #3A75D5 | 4.48:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #3A75D5 | 4.68:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #3A75D5 text on white | 4.48:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #3A75D5 text on black | 4.68:1 | AA | Lc -30.9 | Non-text elements, placeholder text |
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
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A5C2F0
oklch(80.9% 0.073 259.5)
-
Step 400
400
#75A1E8
oklch(70.7% 0.115 259.7)
-
Step 500
500
#5188E1
oklch(63.1% 0.147 259.6)
-
Step 600
600 (this color)
#3A75D5
oklch(57.3% 0.16 259.7)
-
Step 700
700
#275DB3
oklch(49.1% 0.148 259.5)
-
Step 800
800
#224C91
oklch(42.6% 0.123 259.9)
-
Step 900
900
#214074
oklch(37.7% 0.097 260.1)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#3A75D5 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) | #447FD9 | 0.030 |
| Deuteranopia (no green cones) | #2370D3 | 0.023 |
| Tritanopia (no blue cones) | #008C9A | 0.128 |
| Achromatopsia (no color) | #777777 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A75D5
#3A75D5
oklch(57.3% 0.16 259.7)
- #9D6F00
#9D6F00
oklch(57.4% 0.119 79.8)
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 #3A75D5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- Royal Blue #4169E1 ΔE 0.037
- Cerulean Blue #056EEE ΔE 0.051
- Water Blue #0E87CC ΔE 0.055
- Clear Blue #247AFD ΔE 0.061
- Mid Blue #276AB3 ΔE 0.062
- French Blue #436BAD ΔE 0.063
- Neon Blue #4361EE ΔE 0.064
Use #3A75D5 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.