#5973B5
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.107 266.7), rgb(89, 115, 181).
Aa
White text reads best on this color (4.62:1).
About this color
#5973B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.107 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #5973B5 |
| RGB | rgb(89, 115, 181) |
| HSL | hsl(223, 38%, 53%) |
| OKLCH | oklch(56.5% 0.107 266.7) |
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 #5973B5 | 4.62:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #5973B5 | 4.54:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #5973B5 text on white | 4.62:1 | AA | Lc 72.0 | Content text, not long reading |
| #5973B5 text on black | 4.54:1 | AA | Lc -29.7 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C0E1
oklch(80.8% 0.049 267.1)
-
Step 400
400
#8BA0D2
oklch(70.8% 0.077 266.8)
-
Step 500
500
#6E87C6
oklch(63% 0.1 267)
-
Step 600
600 (this color)
#5973B5
oklch(56.5% 0.107 266.7)
-
Step 700
700
#475E99
oklch(49.1% 0.099 266.7)
-
Step 800
800
#3A4D7C
oklch(42.7% 0.082 266.3)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#5973B5 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) | #5979B8 | 0.016 |
| Deuteranopia (no green cones) | #4F71B4 | 0.014 |
| Tritanopia (no blue cones) | #30818B | 0.096 |
| Achromatopsia (no color) | #757575 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5973B5
#5973B5
oklch(56.5% 0.107 266.7)
- #917119
#917119
oklch(56.5% 0.107 87)
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 #5973B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- French Blue #436BAD ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.045
- Dull Blue #49759C ΔE 0.047
- Cool Blue #4984B8 ΔE 0.048
- Muted Blue #3B719F ΔE 0.050
- Stormy Blue #507B9C ΔE 0.052
Use #5973B5 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.