#5B73AC
Closest named color: Flat Blue (#3C73A8). oklch(56.1% 0.093 266.1), rgb(91, 115, 172).
Aa
White text reads best on this color (4.67:1).
About this color
#5B73AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.093 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.035 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #5B73AC |
| RGB | rgb(91, 115, 172) |
| HSL | hsl(222, 33%, 52%) |
| OKLCH | oklch(56.1% 0.093 266.1) |
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 #5B73AC | 4.67:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #5B73AC | 4.49:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #5B73AC text on white | 4.67:1 | AA | Lc 72.4 | Content text, not long reading |
| #5B73AC text on black | 4.49:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C1DD
oklch(81% 0.042 265.7)
-
Step 400
400
#8DA0CB
oklch(70.7% 0.067 266.1)
-
Step 500
500
#7188BE
oklch(63% 0.086 266.3)
-
Step 600
600 (this color)
#5B73AC
oklch(56.1% 0.093 266.1)
-
Step 700
700
#495F92
oklch(49.1% 0.087 265.6)
-
Step 800
800
#3C4E77
oklch(42.8% 0.072 265.4)
-
Step 900
900
#344160
oklch(37.8% 0.056 266.4)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#5B73AC 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) | #5E78AE | 0.015 |
| Deuteranopia (no green cones) | #5571AB | 0.010 |
| Tritanopia (no blue cones) | #3B7F88 | 0.083 |
| Achromatopsia (no color) | #747474 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B73AC
#5B73AC
oklch(56.1% 0.093 266.1)
- #8D712C
#8D712C
oklch(56.2% 0.093 86.6)
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 #5B73AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.035
- Dull Blue #49759C ΔE 0.036
- French Blue #436BAD ΔE 0.039
- Stormy Blue #507B9C ΔE 0.041
- Muted Blue #3B719F ΔE 0.043
- Steel Blue #4682B4 ΔE 0.044
- Windows Blue #3778BF ΔE 0.044
- Cerulean #457B9D ΔE 0.044
Use #5B73AC 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.