#2273C1
Closest named color: Windows Blue (#3778BF). oklch(54.8% 0.143 251.7), rgb(34, 115, 193).
Aa
White text reads best on this color (4.89:1).
About this color
#2273C1 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.143 and its hue 252°. 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 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.29:1 |
| White text | 4.89:1 |
Values
| HEX | #2273C1 |
| RGB | rgb(34, 115, 193) |
| HSL | hsl(209, 70%, 45%) |
| OKLCH | oklch(54.8% 0.143 251.7) |
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 #2273C1 | 4.89:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #2273C1 | 4.29:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #2273C1 text on white | 4.89:1 | AA | Lc 73.5 | Content text, not long reading |
| #2273C1 text on black | 4.29:1 | AA large text | Lc -28.2 | 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
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A3C4EA
oklch(80.9% 0.065 252.2)
-
Step 400
400
#70A5DF
oklch(70.8% 0.102 251.5)
-
Step 500
500
#478DD6
oklch(63.1% 0.131 251.5)
-
Step 600
600 (this color)
#2273C1
oklch(54.8% 0.143 251.7)
-
Step 700
700
#1662A9
oklch(49.1% 0.133 251.8)
-
Step 800
800
#165089
oklch(42.6% 0.111 252)
-
Step 900
900
#1A436D
oklch(37.6% 0.085 251.6)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#2273C1 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) | #4D79C4 | 0.041 |
| Deuteranopia (no green cones) | #326ABF | 0.025 |
| Tritanopia (no blue cones) | #008690 | 0.107 |
| Achromatopsia (no color) | #717171 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2273C1
#2273C1
oklch(54.8% 0.143 251.7)
- #9B6400
#9B6400
oklch(55% 0.118 71.9)
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 #2273C1, 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 0.030
- Nice Blue #107AB0 ΔE 0.037
- French Blue #436BAD ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.042
- Muted Blue #3B719F ΔE 0.054
- Water Blue #0E87CC ΔE 0.055
- Steel Blue #4682B4 ΔE 0.060
Use #2273C1 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.