#5F73BC
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.115 270.8), rgb(95, 115, 188).
Aa
Black text reads best on this color (4.66:1).
About this color
#5F73BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.115 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.041 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #5F73BC |
| RGB | rgb(95, 115, 188) |
| HSL | hsl(227, 41%, 55%) |
| OKLCH | oklch(57.3% 0.115 270.8) |
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 #5F73BC | 4.50:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #5F73BC | 4.66:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #5F73BC text on white | 4.50:1 | AA | Lc 71.1 | Content text, not long reading |
| #5F73BC text on black | 4.66:1 | AA | Lc -30.5 | Non-text elements, placeholder text |
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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B4C0E3
oklch(81% 0.051 270.3)
-
Step 400
400
#8D9ED5
oklch(70.7% 0.083 270.9)
-
Step 500
500
#7285CA
oklch(63.1% 0.107 271.4)
-
Step 600
600 (this color)
#5F73BC
oklch(57.3% 0.115 270.8)
-
Step 700
700
#4A5C9D
oklch(49.1% 0.106 270.4)
-
Step 800
800
#3D4B7F
oklch(42.6% 0.088 270.9)
-
Step 900
900
#343F66
oklch(37.7% 0.069 270.9)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#5F73BC 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) | #577BBF | 0.022 |
| Deuteranopia (no green cones) | #4D73BA | 0.022 |
| Tritanopia (no blue cones) | #39828E | 0.103 |
| Achromatopsia (no color) | #777777 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F73BC
#5F73BC
oklch(57.3% 0.115 270.8)
- #927407
#927407
oklch(57.2% 0.115 90.3)
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 #5F73BC, closest first.
No curated palette has a color within ΔE 0.04 of #5F73BC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.041
- French Blue #436BAD ΔE 0.048
- Steel Blue #4682B4 ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.052
- Cool Blue #4984B8 ΔE 0.052
- Off Blue #5684AE ΔE 0.058
- Dull Blue #49759C ΔE 0.060
- Stormy Blue #507B9C ΔE 0.063
Use #5F73BC 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.