#5B5BCC
Closest named color: Iris (#6258C4). oklch(53.3% 0.171 278.9), rgb(91, 91, 204).
Aa
White text reads best on this color (5.50:1).
About this color
#5B5BCC is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.171 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.017 away. White text reads best on it, at 5.50:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.81:1 |
| White text | 5.50:1 |
Values
| HEX | #5B5BCC |
| RGB | rgb(91, 91, 204) |
| HSL | hsl(240, 53%, 58%) |
| OKLCH | oklch(53.3% 0.171 278.9) |
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 #5B5BCC | 5.50:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #5B5BCC | 3.81:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #5B5BCC text on white | 5.50:1 | AA | Lc 77.2 | Fine for body text |
| #5B5BCC text on black | 3.81:1 | AA large text | Lc -24.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F6
oklch(88.5% 0.043 278.2)
-
Step 300
300
#B5BCF2
oklch(80.9% 0.077 278.8)
-
Step 400
400
#9098EC
oklch(70.7% 0.123 278.6)
-
Step 500
500
#777CE6
oklch(63.2% 0.157 278.9)
-
Step 600
600 (this color)
#5B5BCC
oklch(53.3% 0.171 278.9)
-
Step 700
700
#5150B8
oklch(49.1% 0.16 279.2)
-
Step 800
800
#424395
oklch(42.8% 0.131 278.8)
-
Step 900
900
#373976
oklch(37.6% 0.102 278.9)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#5B5BCC 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) | #086DD0 | 0.072 |
| Deuteranopia (no green cones) | #0064CA | 0.071 |
| Tritanopia (no blue cones) | #21758B | 0.147 |
| Achromatopsia (no color) | #696969 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5BCC
#5B5BCC
oklch(53.3% 0.171 278.9)
- #7D6D00
#7D6D00
oklch(53.4% 0.111 99.1)
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 #5B5BCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.017
- Dark Periwinkle #665FD1 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.022
- Light Indigo #6D5ACF ΔE 0.028
- Warm Blue #4B57DB ΔE 0.034
- Royal Blue #4169E1 ΔE 0.051
- Bluey Purple #6241C7 ΔE 0.057
- Neon Blue #4361EE ΔE 0.059
Use #5B5BCC 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.