#5B73E9
Closest named color: Cornflower (#6A79F7). oklch(59.8% 0.179 271.4), rgb(91, 115, 233).
Aa
Black text reads best on this color (5.07:1).
About this color
#5B73E9 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.179 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.033 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #5B73E9 |
| RGB | rgb(91, 115, 233) |
| HSL | hsl(230, 76%, 64%) |
| OKLCH | oklch(59.8% 0.179 271.4) |
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 #5B73E9 | 4.13:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #5B73E9 | 5.07:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #5B73E9 text on white | 4.13:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #5B73E9 text on black | 5.07:1 | AA | Lc -33.5 | 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 500.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF8
oklch(70.7% 0.141 271.2)
-
Step 500
500 (this color)
#5B73E9
oklch(59.8% 0.179 271.4)
-
Step 600
600
#4D63E3
oklch(55.6% 0.195 271.2)
-
Step 700
700
#3F51C5
oklch(49.1% 0.181 271.4)
-
Step 800
800
#3443A0
oklch(42.7% 0.151 271.5)
-
Step 900
900
#2C3A7F
oklch(37.7% 0.117 271.1)
-
Step 950
950
#1A224A
oklch(26.9% 0.075 272)
#5B73E9 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) | #3083ED | 0.050 |
| Deuteranopia (no green cones) | #0177E7 | 0.057 |
| Tritanopia (no blue cones) | #008EA3 | 0.153 |
| Achromatopsia (no color) | #7D7D7D | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B73E9
#5B73E9
oklch(59.8% 0.179 271.4)
- #9B7C00
#9B7C00
oklch(59.9% 0.122 91.2)
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 #5B73E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.033
- Royal Blue #4169E1 ΔE 0.043
- Medium Slate Blue #7B68EE ΔE 0.049
- Clear Blue #247AFD ΔE 0.052
- Neon Blue #4361EE ΔE 0.056
- Soft Blue #6488EA ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.063
Use #5B73E9 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.