#5B73DF
Closest named color: Royal Blue (#4169E1). oklch(59.2% 0.166 271.1), rgb(91, 115, 223).
Aa
Black text reads best on this color (4.96:1).
About this color
#5B73DF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.166 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.042 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #5B73DF |
| RGB | rgb(91, 115, 223) |
| HSL | hsl(229, 67%, 62%) |
| OKLCH | oklch(59.2% 0.166 271.1) |
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 #5B73DF | 4.23:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #5B73DF | 4.96:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #5B73DF text on white | 4.23:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #5B73DF text on black | 4.96:1 | AA | Lc -32.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AFBFF2
oklch(81% 0.074 271.1)
-
Step 400
400
#859CEB
oklch(70.7% 0.119 270.8)
-
Step 500
500
#6881E5
oklch(63.1% 0.153 270.9)
-
Step 600
600 (this color)
#5B73DF
oklch(59.2% 0.166 271.1)
-
Step 700
700
#4256B7
oklch(49.1% 0.154 270.9)
-
Step 800
800
#374794
oklch(42.8% 0.127 271.2)
-
Step 900
900
#2F3C76
oklch(37.7% 0.1 271.4)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#5B73DF 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) | #3C81E3 | 0.042 |
| Deuteranopia (no green cones) | #2476DD | 0.048 |
| Tritanopia (no blue cones) | #008C9E | 0.146 |
| Achromatopsia (no color) | #7B7B7B | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B73DF
#5B73DF
oklch(59.2% 0.166 271.1)
- #997A00
#997A00
oklch(59.2% 0.121 90.9)
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 #5B73DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.042
- Cornflower #6A79F7 ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.055
- Soft Blue #6488EA ΔE 0.057
- Neon Blue #4361EE ΔE 0.061
- Clear Blue #247AFD ΔE 0.061
- Light Indigo #6D5ACF ΔE 0.064
Use #5B73DF 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.