#5556B3
Closest named color: Iris (#6258C4). oklch(50.1% 0.144 279.4), rgb(85, 86, 179).
Aa
White text reads best on this color (6.23:1).
About this color
#5556B3 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.144 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.034 away. White text reads best on it, at 6.23:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.36:1 |
| White text | 6.23:1 |
Values
| HEX | #5556B3 |
| RGB | rgb(85, 86, 179) |
| HSL | hsl(239, 38%, 52%) |
| OKLCH | oklch(50.1% 0.144 279.4) |
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 #5556B3 | 6.23:1 | AA | Lc -86.0 | Fine for body text |
| Black text on #5556B3 | 3.36:1 | AA large text | Lc 23.2 | Dividers and decoration only |
| #5556B3 text on white | 6.23:1 | AA | Lc 80.8 | Fine for body text |
| #5556B3 text on black | 3.36:1 | AA large text | Lc -21.0 | 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
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B7BCEE
oklch(80.8% 0.071 280.2)
-
Step 400
400
#9299E5
oklch(70.7% 0.111 279.1)
-
Step 500
500
#797DDD
oklch(63% 0.143 279.7)
-
Step 600
600
#6365CB
oklch(55.7% 0.154 279.3)
-
Step 700
700 (this color)
#5556B3
oklch(50.1% 0.144 279.4)
-
Step 800
800
#43448E
oklch(42.6% 0.12 279.5)
-
Step 900
900
#383A72
oklch(37.7% 0.094 279.3)
-
Step 950
950
#212242
oklch(26.9% 0.059 280.3)
#5556B3 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) | #2664B6 | 0.057 |
| Deuteranopia (no green cones) | #1B5DB1 | 0.060 |
| Tritanopia (no blue cones) | #2D6B7C | 0.126 |
| Achromatopsia (no color) | #616161 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5556B3
#5556B3
oklch(50.1% 0.144 279.4)
- #726400
#726400
oklch(50.1% 0.104 99.7)
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 #5556B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.059
- French Blue #436BAD ΔE 0.060
- Dusky Blue #475F94 ΔE 0.062
- Warm Blue #4B57DB ΔE 0.063
Use #5556B3 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.