#0377CA
Closest named color: Windows Blue (#3778BF). oklch(55.9% 0.155 249.4), rgb(3, 119, 202).
Aa
White text reads best on this color (4.67:1).
About this color
#0377CA is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.155 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #0377CA |
| RGB | rgb(3, 119, 202) |
| HSL | hsl(205, 97%, 40%) |
| OKLCH | oklch(55.9% 0.155 249.4) |
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 #0377CA | 4.67:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #0377CA | 4.49:1 | AA large text | Lc 32.3 | Non-text elements, placeholder text |
| #0377CA text on white | 4.67:1 | AA | Lc 71.8 | Content text, not long reading |
| #0377CA text on black | 4.49:1 | AA large text | Lc -29.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9EC5EC
oklch(80.9% 0.069 248.7)
-
Step 400
400
#67A6E3
oklch(70.8% 0.111 248.9)
-
Step 500
500
#388EDB
oklch(63.1% 0.142 249.1)
-
Step 600
600 (this color)
#0377CA
oklch(55.9% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#104470
oklch(37.8% 0.092 248.9)
-
Step 950
950
#0C2842
oklch(27.1% 0.059 249.5)
#0377CA 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) | #4D7DCD | 0.049 |
| Deuteranopia (no green cones) | #2B6DC8 | 0.028 |
| Tritanopia (no blue cones) | #008B96 | 0.112 |
| Achromatopsia (no color) | #747474 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0377CA
#0377CA
oklch(55.9% 0.155 249.4)
- #A16500
#A16500
oklch(55.9% 0.122 69.5)
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 #0377CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Nice Blue #107AB0 ΔE 0.043
- Water Blue #0E87CC ΔE 0.045
- Mid Blue #276AB3 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.056
- French Blue #436BAD ΔE 0.056
- Royal Blue #4169E1 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.062
Use #0377CA 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.