#3773A8
Closest named color: Flat Blue (#3C73A8). oklch(54% 0.104 247.7), rgb(55, 115, 168).
Aa
White text reads best on this color (5.02:1).
About this color
#3773A8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.104 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.004 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #3773A8 |
| RGB | rgb(55, 115, 168) |
| HSL | hsl(208, 51%, 44%) |
| OKLCH | oklch(54% 0.104 247.7) |
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 #3773A8 | 5.02:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #3773A8 | 4.18:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #3773A8 text on white | 5.02:1 | AA | Lc 74.5 | Content text, not long reading |
| #3773A8 text on black | 4.18:1 | AA large text | Lc -27.2 | 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
#7BA5CD
oklch(70.6% 0.075 247.7)
-
Step 500
500
#588EC1
oklch(63% 0.096 248.3)
-
Step 600
600 (this color)
#3773A8
oklch(54% 0.104 247.7)
-
Step 700
700
#2E6495
oklch(49% 0.098 248.5)
-
Step 800
800
#275279
oklch(42.7% 0.081 248.2)
-
Step 900
900
#254461
oklch(37.7% 0.062 248.3)
-
Step 950
950
#162839
oklch(27% 0.04 248.2)
#3773A8 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) | #5C75AA | 0.041 |
| Deuteranopia (no green cones) | #4C6AA7 | 0.030 |
| Tritanopia (no blue cones) | #008086 | 0.080 |
| Achromatopsia (no color) | #6F6F6F | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3773A8
#3773A8
oklch(54% 0.104 247.7)
- #966220
#966220
oklch(54.1% 0.104 68.1)
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 #3773A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.004
- Muted Blue #3B719F ΔE 0.014
- Nice Blue #107AB0 ΔE 0.026
- Dull Blue #49759C ΔE 0.027
- French Blue #436BAD ΔE 0.027
- Ocean Blue #03719C ΔE 0.034
- Cerulean #457B9D ΔE 0.036
- Windows Blue #3778BF ΔE 0.036
Use #3773A8 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.