#3D75B2
Closest named color: Flat Blue (#3C73A8). oklch(55.3% 0.112 252.3), rgb(61, 117, 178).
Aa
White text reads best on this color (4.78:1).
About this color
#3D75B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.112 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.016 away. White text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.38:1 |
| White text | 4.78:1 |
Values
| HEX | #3D75B2 |
| RGB | rgb(61, 117, 178) |
| HSL | hsl(211, 49%, 47%) |
| OKLCH | oklch(55.3% 0.112 252.3) |
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 #3D75B2 | 4.78:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #3D75B2 | 4.38:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #3D75B2 text on white | 4.78:1 | AA | Lc 73.0 | Content text, not long reading |
| #3D75B2 text on black | 4.38:1 | AA large text | Lc -28.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#AAC3E1
oklch(80.8% 0.051 253.1)
-
Step 400
400
#7CA4D2
oklch(70.7% 0.081 252.4)
-
Step 500
500
#598DC6
oklch(63.1% 0.103 251.8)
-
Step 600
600 (this color)
#3D75B2
oklch(55.3% 0.112 252.3)
-
Step 700
700
#30639A
oklch(49.1% 0.104 252.2)
-
Step 800
800
#28517D
oklch(42.7% 0.087 252)
-
Step 900
900
#254364
oklch(37.6% 0.067 252.1)
-
Step 950
950
#16283B
oklch(27.1% 0.043 250.9)
#3D75B2 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) | #5A78B5 | 0.034 |
| Deuteranopia (no green cones) | #4A6DB1 | 0.024 |
| Tritanopia (no blue cones) | #00838B | 0.089 |
| Achromatopsia (no color) | #727272 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D75B2
#3D75B2
oklch(55.3% 0.112 252.3)
- #9A6612
#9A6612
oklch(55.3% 0.112 72.3)
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 #3D75B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.016
- Windows Blue #3778BF ΔE 0.020
- French Blue #436BAD ΔE 0.027
- Nice Blue #107AB0 ΔE 0.028
- Muted Blue #3B719F ΔE 0.030
- Dull Blue #49759C ΔE 0.036
- Mid Blue #276AB3 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.039
Use #3D75B2 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.