#3877BA
Closest named color: Windows Blue (#3778BF). oklch(56% 0.123 252.1), rgb(56, 119, 186).
Aa
White text reads best on this color (4.65:1).
About this color
#3877BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.123 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.008 away. White text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.51:1 |
| White text | 4.65:1 |
Values
| HEX | #3877BA |
| RGB | rgb(56, 119, 186) |
| HSL | hsl(211, 54%, 47%) |
| OKLCH | oklch(56% 0.123 252.1) |
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 #3877BA | 4.65:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #3877BA | 4.51:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #3877BA text on white | 4.65:1 | AA | Lc 72.0 | Content text, not long reading |
| #3877BA text on black | 4.51:1 | AA | Lc -29.7 | 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
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A7C4E4
oklch(81% 0.055 251.1)
-
Step 400
400
#78A4D7
oklch(70.7% 0.089 252.7)
-
Step 500
500
#548DCC
oklch(63.2% 0.113 252.2)
-
Step 600
600 (this color)
#3877BA
oklch(56% 0.123 252.1)
-
Step 700
700
#29639F
oklch(49.2% 0.114 251.9)
-
Step 800
800
#235181
oklch(42.8% 0.095 251.8)
-
Step 900
900
#224367
oklch(37.6% 0.073 252.1)
-
Step 950
950
#15283D
oklch(27.2% 0.047 252.1)
#3877BA 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) | #597BBD | 0.037 |
| Deuteranopia (no green cones) | #466FB9 | 0.024 |
| Tritanopia (no blue cones) | #008790 | 0.095 |
| Achromatopsia (no color) | #747474 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3877BA
#3877BA
oklch(56% 0.123 252.1)
- #9F6700
#9F6700
oklch(56.1% 0.12 72.2)
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 #3877BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.008
- Flat Blue #3C73A8 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.029
- French Blue #436BAD ΔE 0.035
- Steel Blue #4682B4 ΔE 0.039
- Mid Blue #276AB3 ΔE 0.041
- Muted Blue #3B719F ΔE 0.042
- Cool Blue #4984B8 ΔE 0.043
Use #3877BA 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.