#5F73BA
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.112 270.6), rgb(95, 115, 186).
Aa
Black text reads best on this color (4.64:1).
About this color
#5F73BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.112 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 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.64:1 |
| White text | 4.51:1 |
Values
| HEX | #5F73BA |
| RGB | rgb(95, 115, 186) |
| HSL | hsl(227, 40%, 55%) |
| OKLCH | oklch(57.2% 0.112 270.6) |
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 #5F73BA | 4.51:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #5F73BA | 4.64:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #5F73BA text on white | 4.51:1 | AA | Lc 71.3 | Content text, not long reading |
| #5F73BA text on black | 4.64:1 | AA | Lc -30.4 | 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
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B4C0E2
oklch(81% 0.05 269.9)
-
Step 400
400
#8D9ED4
oklch(70.6% 0.082 270.7)
-
Step 500
500
#7286C8
oklch(63.2% 0.102 270.4)
-
Step 600
600 (this color)
#5F73BA
oklch(57.2% 0.112 270.6)
-
Step 700
700
#4B5C9C
oklch(49.1% 0.105 270.9)
-
Step 800
800
#3D4B7E
oklch(42.6% 0.087 270.8)
-
Step 900
900
#343F65
oklch(37.6% 0.067 270.7)
-
Step 950
950
#1E253B
oklch(26.9% 0.042 269.9)
#5F73BA 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) | #587BBD | 0.022 |
| Deuteranopia (no green cones) | #4F73B8 | 0.020 |
| Tritanopia (no blue cones) | #3A828D | 0.101 |
| Achromatopsia (no color) | #767676 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F73BA
#5F73BA
oklch(57.2% 0.112 270.6)
- #917410
#917410
oklch(57.1% 0.112 90.4)
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 #5F73BA, closest first.
No curated palette has a color within ΔE 0.04 of #5F73BA.
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 0.047
- Steel Blue #4682B4 ΔE 0.050
- Flat Blue #3C73A8 ΔE 0.050
- Cool Blue #4984B8 ΔE 0.051
- Off Blue #5684AE ΔE 0.056
- Dull Blue #49759C ΔE 0.057
- Stormy Blue #507B9C ΔE 0.061
Use #5F73BA 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.