#1F73BD
Closest named color: Windows Blue (#3778BF). oklch(54.5% 0.139 250.1), rgb(31, 115, 189).
Aa
White text reads best on this color (4.94:1).
About this color
#1F73BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.139 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.023 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #1F73BD |
| RGB | rgb(31, 115, 189) |
| HSL | hsl(208, 72%, 43%) |
| OKLCH | oklch(54.5% 0.139 250.1) |
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 #1F73BD | 4.94:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #1F73BD | 4.24:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #1F73BD text on white | 4.94:1 | AA | Lc 73.8 | Content text, not long reading |
| #1F73BD text on black | 4.24:1 | AA large text | Lc -27.9 | 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
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500
#468ED3
oklch(63.2% 0.127 249.7)
-
Step 600
600 (this color)
#1F73BD
oklch(54.5% 0.139 250.1)
-
Step 700
700
#1463A6
oklch(49.1% 0.129 250)
-
Step 800
800
#155187
oklch(42.7% 0.107 250.3)
-
Step 900
900
#19446C
oklch(37.8% 0.083 249.6)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#1F73BD 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) | #4F78C0 | 0.043 |
| Deuteranopia (no green cones) | #366ABC | 0.026 |
| Tritanopia (no blue cones) | #00858F | 0.101 |
| Achromatopsia (no color) | #707070 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F73BD
#1F73BD
oklch(54.5% 0.139 250.1)
- #9B6200
#9B6200
oklch(54.6% 0.118 70.3)
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 #1F73BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.023
- Mid Blue #276AB3 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.032
- French Blue #436BAD ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.037
- Muted Blue #3B719F ΔE 0.048
- Ocean Blue #03719C ΔE 0.054
- Water Blue #0E87CC ΔE 0.056
Use #1F73BD 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.