#2B73CE
Closest named color: Windows Blue (#3778BF). oklch(55.9% 0.158 256.2), rgb(43, 115, 206).
Aa
White text reads best on this color (4.72:1).
About this color
#2B73CE is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.158 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #2B73CE |
| RGB | rgb(43, 115, 206) |
| HSL | hsl(213, 65%, 49%) |
| OKLCH | oklch(55.9% 0.158 256.2) |
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 #2B73CE | 4.72:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #2B73CE | 4.44:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #2B73CE text on white | 4.72:1 | AA | Lc 72.3 | Content text, not long reading |
| #2B73CE text on black | 4.44:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#71A3E6
oklch(70.8% 0.112 256)
-
Step 500
500
#4A8ADF
oklch(63.1% 0.145 256.3)
-
Step 600
600 (this color)
#2B73CE
oklch(55.9% 0.158 256.2)
-
Step 700
700
#1C5FB1
oklch(49.1% 0.146 256.1)
-
Step 800
800
#1A4E90
oklch(42.7% 0.122 256.3)
-
Step 900
900
#1C4173
oklch(37.6% 0.096 256.8)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#2B73CE 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) | #447BD1 | 0.032 |
| Deuteranopia (no green cones) | #226CCC | 0.021 |
| Tritanopia (no blue cones) | #008996 | 0.121 |
| Achromatopsia (no color) | #737373 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B73CE
#2B73CE
oklch(55.9% 0.158 256.2)
- #9B6900
#9B6900
oklch(55.9% 0.117 76.1)
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 #2B73CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Royal Blue #4169E1 ΔE 0.043
- Mid Blue #276AB3 ΔE 0.047
- French Blue #436BAD ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.054
- Water Blue #0E87CC ΔE 0.055
- Nice Blue #107AB0 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.060
Use #2B73CE 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.