#2773BD
Closest named color: Windows Blue (#3778BF). oklch(54.7% 0.137 251.4), rgb(39, 115, 189).
Aa
White text reads best on this color (4.91:1).
About this color
#2773BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.137 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.020 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #2773BD |
| RGB | rgb(39, 115, 189) |
| HSL | hsl(210, 66%, 45%) |
| OKLCH | oklch(54.7% 0.137 251.4) |
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 #2773BD | 4.91:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #2773BD | 4.27:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #2773BD text on white | 4.91:1 | AA | Lc 73.6 | Content text, not long reading |
| #2773BD text on black | 4.27:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A4C4E8
oklch(80.9% 0.062 251.6)
-
Step 400
400
#72A5DC
oklch(70.8% 0.098 251.1)
-
Step 500
500
#4A8DD3
oklch(63.1% 0.126 251.4)
-
Step 600
600 (this color)
#2773BD
oklch(54.7% 0.137 251.4)
-
Step 700
700
#1C62A6
oklch(49% 0.128 251.8)
-
Step 800
800
#1A5186
oklch(42.8% 0.105 251.1)
-
Step 900
900
#1C436B
oklch(37.6% 0.082 251.4)
-
Step 950
950
#12283F
oklch(27.1% 0.051 251.2)
#2773BD 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) | #5078C0 | 0.040 |
| Deuteranopia (no green cones) | #386ABC | 0.025 |
| Tritanopia (no blue cones) | #00858F | 0.102 |
| Achromatopsia (no color) | #717171 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2773BD
#2773BD
oklch(54.7% 0.137 251.4)
- #9B6300
#9B6300
oklch(54.8% 0.118 71.1)
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 #2773BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.020
- Mid Blue #276AB3 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.033
- French Blue #436BAD ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.035
- Muted Blue #3B719F ΔE 0.047
- Water Blue #0E87CC ΔE 0.056
- Ocean Blue #03719C ΔE 0.056
Use #2773BD 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.