#5B6FDF
Closest named color: Royal Blue (#4169E1). oklch(58.4% 0.171 272.4), rgb(91, 111, 223).
Aa
Black text reads best on this color (4.78:1).
About this color
#5B6FDF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.171 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.035 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.78:1 |
| White text | 4.38:1 |
Values
| HEX | #5B6FDF |
| RGB | rgb(91, 111, 223) |
| HSL | hsl(231, 67%, 62%) |
| OKLCH | oklch(58.4% 0.171 272.4) |
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 #5B6FDF | 4.38:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #5B6FDF | 4.78:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #5B6FDF text on white | 4.38:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #5B6FDF text on black | 4.78:1 | AA | Lc -31.5 | 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 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBEF3
oklch(80.9% 0.077 272.3)
-
Step 400
400
#879BED
oklch(70.8% 0.122 272.5)
-
Step 500
500
#6A80E7
oklch(63.2% 0.156 272.2)
-
Step 600
600 (this color)
#5B6FDF
oklch(58.4% 0.171 272.4)
-
Step 700
700
#4454B9
oklch(49% 0.159 272.4)
-
Step 800
800
#384696
oklch(42.8% 0.131 272.2)
-
Step 900
900
#303B77
oklch(37.6% 0.103 272.7)
-
Step 950
950
#1C2346
oklch(27% 0.065 272.8)
#5B6FDF 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) | #327EE3 | 0.049 |
| Deuteranopia (no green cones) | #1473DD | 0.055 |
| Tritanopia (no blue cones) | #00899C | 0.150 |
| Achromatopsia (no color) | #787878 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FDF
#5B6FDF
oklch(58.4% 0.171 272.4)
- #947800
#947800
oklch(58.3% 0.119 92.5)
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 #5B6FDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.035
- Dark Periwinkle #665FD1 ΔE 0.043
- Cornflower #6A79F7 ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.052
- Neon Blue #4361EE ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.056
- Clear Blue #247AFD ΔE 0.063
Use #5B6FDF 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.