#5B64B8
Closest named color: Iris (#6258C4). oklch(53.7% 0.131 276.5), rgb(91, 100, 184).
Aa
White text reads best on this color (5.30:1).
About this color
#5B64B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.131 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #5B64B8 |
| RGB | rgb(91, 100, 184) |
| HSL | hsl(234, 40%, 54%) |
| OKLCH | oklch(53.7% 0.131 276.5) |
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 #5B64B8 | 5.30:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #5B64B8 | 3.95:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #5B64B8 text on white | 5.30:1 | AA | Lc 76.2 | Fine for body text |
| #5B64B8 text on black | 3.95:1 | AA large text | Lc -25.5 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B6BEE7
oklch(80.9% 0.059 276.4)
-
Step 400
400
#919BDB
oklch(70.6% 0.094 276.9)
-
Step 500
500
#7782D1
oklch(63.2% 0.119 276.4)
-
Step 600
600 (this color)
#5B64B8
oklch(53.7% 0.131 276.5)
-
Step 700
700
#5058A4
oklch(49.2% 0.121 276.5)
-
Step 800
800
#414885
oklch(42.7% 0.101 276.3)
-
Step 900
900
#373D6B
oklch(37.8% 0.079 276.3)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#5B64B8 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) | #406FBB | 0.039 |
| Deuteranopia (no green cones) | #3768B6 | 0.042 |
| Tritanopia (no blue cones) | #357685 | 0.115 |
| Achromatopsia (no color) | #6B6B6B | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B64B8
#5B64B8
oklch(53.7% 0.131 276.5)
- #816D00
#816D00
oklch(53.8% 0.111 96.3)
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 #5B64B8, closest first.
No curated palette has a color within ΔE 0.04 of #5B64B8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- French Blue #436BAD ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.045
- Slate Blue #6A5ACD ΔE 0.048
- Light Indigo #6D5ACF ΔE 0.052
- Mid Blue #276AB3 ΔE 0.055
- Windows Blue #3778BF ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.061
Use #5B64B8 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.