#3775BF
Closest named color: Windows Blue (#3778BF). oklch(55.8% 0.132 254.5), rgb(55, 117, 191).
Aa
White text reads best on this color (4.70:1).
About this color
#3775BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.132 and its hue 255°. 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 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.45:1 |
| White text | 4.70:1 |
Values
| HEX | #3775BF |
| RGB | rgb(55, 117, 191) |
| HSL | hsl(213, 55%, 48%) |
| OKLCH | oklch(55.8% 0.132 254.5) |
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 #3775BF | 4.70:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #3775BF | 4.45:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #3775BF text on white | 4.70:1 | AA | Lc 72.4 | Content text, not long reading |
| #3775BF text on black | 4.45:1 | AA large text | Lc -29.3 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E7
oklch(80.9% 0.06 254.8)
-
Step 400
400
#77A3DB
oklch(70.6% 0.095 254.8)
-
Step 500
500
#538CD1
oklch(63.2% 0.121 254.2)
-
Step 600
600 (this color)
#3775BF
oklch(55.8% 0.132 254.5)
-
Step 700
700
#2961A4
oklch(49% 0.123 254.8)
-
Step 800
800
#235085
oklch(42.8% 0.101 254.3)
-
Step 900
900
#22436B
oklch(37.9% 0.079 254.4)
-
Step 950
950
#14273E
oklch(26.9% 0.05 254.1)
#3775BF 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) | #537AC2 | 0.033 |
| Deuteranopia (no green cones) | #3E6EBE | 0.019 |
| Tritanopia (no blue cones) | #008691 | 0.101 |
| Achromatopsia (no color) | #737373 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3775BF
#3775BF
oklch(55.8% 0.132 254.5)
- #9C6800
#9C6800
oklch(55.9% 0.118 74.7)
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 #3775BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.008
- French Blue #436BAD ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.036
- Mid Blue #276AB3 ΔE 0.038
- Steel Blue #4682B4 ΔE 0.048
- Muted Blue #3B719F ΔE 0.049
- Water Blue #0E87CC ΔE 0.050
Use #3775BF 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.