#3775AB
Closest named color: Flat Blue (#3C73A8). oklch(54.7% 0.106 247.5), rgb(55, 117, 171).
Aa
White text reads best on this color (4.88:1).
About this color
#3775AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.106 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.007 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #3775AB |
| RGB | rgb(55, 117, 171) |
| HSL | hsl(208, 51%, 44%) |
| OKLCH | oklch(54.7% 0.106 247.5) |
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 #3775AB | 4.88:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #3775AB | 4.29:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #3775AB text on white | 4.88:1 | AA | Lc 73.6 | Content text, not long reading |
| #3775AB text on black | 4.29:1 | AA large text | Lc -28.1 | 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
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A9C4DE
oklch(80.9% 0.047 247.4)
-
Step 400
400
#7AA5CE
oklch(70.6% 0.076 247.8)
-
Step 500
500
#568EC2
oklch(63% 0.099 247.9)
-
Step 600
600 (this color)
#3775AB
oklch(54.7% 0.106 247.5)
-
Step 700
700
#2C6596
oklch(49.2% 0.099 247.4)
-
Step 800
800
#265279
oklch(42.7% 0.081 247.7)
-
Step 900
900
#244462
oklch(37.7% 0.064 248.4)
-
Step 950
950
#152839
oklch(26.9% 0.04 246.9)
#3775AB 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) | #5D77AD | 0.041 |
| Deuteranopia (no green cones) | #4D6CAA | 0.031 |
| Tritanopia (no blue cones) | #008288 | 0.081 |
| Achromatopsia (no color) | #717171 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3775AB
#3775AB
oklch(54.7% 0.106 247.5)
- #99631F
#99631F
oklch(54.6% 0.106 67.6)
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 #3775AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.007
- Muted Blue #3B719F ΔE 0.020
- Nice Blue #107AB0 ΔE 0.022
- Dull Blue #49759C ΔE 0.028
- French Blue #436BAD ΔE 0.030
- Windows Blue #3778BF ΔE 0.031
- Cerulean #457B9D ΔE 0.034
- Ocean Blue #03719C ΔE 0.039
Use #3775AB 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.