#556DE1
Closest named color: Royal Blue (#4169E1). oklch(57.8% 0.178 271), rgb(85, 109, 225).
Aa
Black text reads best on this color (4.66:1).
About this color
#556DE1 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.178 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #556DE1 |
| RGB | rgb(85, 109, 225) |
| HSL | hsl(230, 70%, 61%) |
| OKLCH | oklch(57.8% 0.178 271) |
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 #556DE1 | 4.50:1 | AA | Lc -76.4 | Fine for body text |
| Black text on #556DE1 | 4.66:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #556DE1 text on white | 4.50:1 | AA | Lc 70.9 | Content text, not long reading |
| #556DE1 text on black | 4.66:1 | AA | Lc -30.7 | Non-text elements, placeholder text |
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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#ADBEF5
oklch(80.8% 0.08 271.2)
-
Step 400
400
#839BF0
oklch(70.7% 0.128 270.9)
-
Step 500
500
#6680EB
oklch(63.2% 0.163 270.8)
-
Step 600
600 (this color)
#556DE1
oklch(57.8% 0.178 271)
-
Step 700
700
#4054BD
oklch(49.1% 0.166 270.9)
-
Step 800
800
#354599
oklch(42.6% 0.138 271.2)
-
Step 900
900
#2E3B79
oklch(37.6% 0.106 271.5)
-
Step 950
950
#1B2347
oklch(27% 0.068 271.8)
#556DE1 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) | #277DE5 | 0.050 |
| Deuteranopia (no green cones) | #0071DF | 0.053 |
| Tritanopia (no blue cones) | #00889D | 0.150 |
| Achromatopsia (no color) | #777777 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DE1
#556DE1
oklch(57.8% 0.178 271)
- #947600
#947600
oklch(57.8% 0.118 90.9)
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 #556DE1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.043
- Neon Blue #4361EE ΔE 0.043
- Cornflower #6A79F7 ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.055
- Warm Blue #4B57DB ΔE 0.056
- Medium Slate Blue #7B68EE ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.056
Use #556DE1 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.