#5B63BC
Closest named color: Iris (#6258C4). oklch(53.7% 0.138 276.8), rgb(91, 99, 188).
Aa
White text reads best on this color (5.30:1).
About this color
#5B63BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.138 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.032 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #5B63BC |
| RGB | rgb(91, 99, 188) |
| HSL | hsl(235, 42%, 55%) |
| OKLCH | oklch(53.7% 0.138 276.8) |
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 #5B63BC | 5.30:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #5B63BC | 3.95:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #5B63BC text on white | 5.30:1 | AA | Lc 76.2 | Fine for body text |
| #5B63BC 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
#D3D8F0
oklch(88.6% 0.033 276.3)
-
Step 300
300
#B6BEE9
oklch(81% 0.061 276.7)
-
Step 400
400
#919BDE
oklch(70.7% 0.099 277)
-
Step 500
500
#7681D5
oklch(63.1% 0.126 276.5)
-
Step 600
600 (this color)
#5B63BC
oklch(53.7% 0.138 276.8)
-
Step 700
700
#5057A8
oklch(49.2% 0.128 276.9)
-
Step 800
800
#414788
oklch(42.6% 0.107 276.9)
-
Step 900
900
#373C6D
oklch(37.7% 0.083 277.2)
-
Step 950
950
#202440
oklch(27.1% 0.052 276.2)
#5B63BC 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) | #3B6FBF | 0.044 |
| Deuteranopia (no green cones) | #3168BA | 0.047 |
| Tritanopia (no blue cones) | #327686 | 0.121 |
| Achromatopsia (no color) | #6B6B6B | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B63BC
#5B63BC
oklch(53.7% 0.138 276.8)
- #806D00
#806D00
oklch(53.7% 0.111 97)
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 #5B63BC, closest first.
No curated palette has a color within ΔE 0.04 of #5B63BC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.041
- French Blue #436BAD ΔE 0.044
- Light Indigo #6D5ACF ΔE 0.046
- Mid Blue #276AB3 ΔE 0.058
- Windows Blue #3778BF ΔE 0.063
- Royal Blue #4169E1 ΔE 0.063
Use #5B63BC 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.