#5B5BBD
Closest named color: Iris (#6258C4). oklch(52.2% 0.15 279.9), rgb(91, 91, 189).
Aa
White text reads best on this color (5.71:1).
About this color
#5B5BBD is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.150 and its hue 280°. 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 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.67:1 |
| White text | 5.71:1 |
Values
| HEX | #5B5BBD |
| RGB | rgb(91, 91, 189) |
| HSL | hsl(240, 43%, 55%) |
| OKLCH | oklch(52.2% 0.15 279.9) |
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 #5B5BBD | 5.71:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #5B5BBD | 3.67:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #5B5BBD text on white | 5.71:1 | AA | Lc 78.3 | Fine for body text |
| #5B5BBD text on black | 3.67:1 | AA large text | Lc -23.5 | 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 700.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F4
oklch(88.5% 0.04 279.3)
-
Step 300
300
#B7BCEF
oklch(80.9% 0.072 280.3)
-
Step 400
400
#9298E8
oklch(70.7% 0.117 279.7)
-
Step 500
500
#797CE1
oklch(63% 0.15 279.9)
-
Step 600
600
#6363CE
oklch(55.5% 0.161 279.8)
-
Step 700
700 (this color)
#5B5BBD
oklch(52.2% 0.15 279.9)
-
Step 800
800
#444391
oklch(42.7% 0.125 280.3)
-
Step 900
900
#383A73
oklch(37.7% 0.096 279.2)
-
Step 950
950
#212244
oklch(27% 0.062 280.1)
#5B5BBD 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) | #296AC0 | 0.060 |
| Deuteranopia (no green cones) | #1D63BB | 0.064 |
| Tritanopia (no blue cones) | #327183 | 0.131 |
| Achromatopsia (no color) | #666666 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5BBD
#5B5BBD
oklch(52.2% 0.15 279.9)
- #796A00
#796A00
oklch(52.2% 0.108 99.5)
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 #5B5BBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.017
- Slate Blue #6A5ACD ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.039
- Warm Blue #4B57DB ΔE 0.053
- French Blue #436BAD ΔE 0.059
- Bluey Purple #6241C7 ΔE 0.061
- Royal Blue #4169E1 ΔE 0.066
Use #5B5BBD 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.