#2273BF
Closest named color: Windows Blue (#3778BF). oklch(54.7% 0.141 251.1), rgb(34, 115, 191).
Aa
White text reads best on this color (4.91:1).
About this color
#2273BF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.141 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.022 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #2273BF |
| RGB | rgb(34, 115, 191) |
| HSL | hsl(209, 70%, 44%) |
| OKLCH | oklch(54.7% 0.141 251.1) |
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 #2273BF | 4.91:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #2273BF | 4.27:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #2273BF text on white | 4.91:1 | AA | Lc 73.6 | Content text, not long reading |
| #2273BF 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E9
oklch(80.9% 0.064 251.5)
-
Step 400
400
#70A5DE
oklch(70.8% 0.101 251.1)
-
Step 500
500
#478DD5
oklch(63.1% 0.13 251.2)
-
Step 600
600 (this color)
#2273BF
oklch(54.7% 0.141 251.1)
-
Step 700
700
#1762A7
oklch(49% 0.131 251.3)
-
Step 800
800
#175188
oklch(42.8% 0.108 251.1)
-
Step 900
900
#1A436D
oklch(37.6% 0.085 251.6)
-
Step 950
950
#112840
oklch(27.1% 0.054 251.3)
#2273BF 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) | #4E78C2 | 0.041 |
| Deuteranopia (no green cones) | #346ABE | 0.025 |
| Tritanopia (no blue cones) | #008590 | 0.103 |
| Achromatopsia (no color) | #717171 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2273BF
#2273BF
oklch(54.7% 0.141 251.1)
- #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 #2273BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.022
- Mid Blue #276AB3 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.034
- French Blue #436BAD ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- Muted Blue #3B719F ΔE 0.051
- Water Blue #0E87CC ΔE 0.055
- Ocean Blue #03719C ΔE 0.058
Use #2273BF 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.