#6556B1
Closest named color: Iris (#6258C4). oklch(51.3% 0.139 288), rgb(101, 86, 177).
Aa
White text reads best on this color (5.96:1).
About this color
#6556B1 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.139 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.030 away. White text reads best on it, at 5.96:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.51:1 |
| White text | 5.96:1 |
Values
| HEX | #6556B1 |
| RGB | rgb(101, 86, 177) |
| HSL | hsl(250, 37%, 52%) |
| OKLCH | oklch(51.3% 0.139 288) |
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 #6556B1 | 5.96:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #6556B1 | 3.51:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #6556B1 text on white | 5.96:1 | AA | Lc 79.6 | Fine for body text |
| #6556B1 text on black | 3.51:1 | AA large text | Lc -22.2 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D7D6F1
oklch(88.5% 0.037 287.3)
-
Step 300
300
#BEBAEA
oklch(80.8% 0.067 288.6)
-
Step 400
400
#9D96E0
oklch(70.8% 0.107 287.7)
-
Step 500
500
#867AD7
oklch(63.1% 0.137 287.7)
-
Step 600
600
#7161C5
oklch(55.6% 0.15 287.9)
-
Step 700
700 (this color)
#6556B1
oklch(51.3% 0.139 288)
-
Step 800
800
#4D428A
oklch(42.8% 0.115 287.5)
-
Step 900
900
#40386E
oklch(37.7% 0.09 288.1)
-
Step 950
950
#252140
oklch(26.9% 0.057 287.9)
#6556B1 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) | #2E66B4 | 0.073 |
| Deuteranopia (no green cones) | #2E61AF | 0.071 |
| Tritanopia (no blue cones) | #4F697B | 0.116 |
| Achromatopsia (no color) | #636363 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6556B1
#6556B1
oklch(51.3% 0.139 288)
- #6E6B00
#6E6B00
oklch(51.4% 0.111 107.8)
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 #6556B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.045
- Light Indigo #6D5ACF ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.052
- Bluey Purple #6241C7 ΔE 0.061
- French Blue #436BAD ΔE 0.068
- Dusky Blue #475F94 ΔE 0.070
- Twilight #4E518B ΔE 0.072
Use #6556B1 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.