#555CD3
Closest named color: Warm Blue (#4B57DB). oklch(53.6% 0.18 275.9), rgb(85, 92, 211).
Aa
White text reads best on this color (5.44:1).
About this color
#555CD3 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.180 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.023 away. White text reads best on it, at 5.44:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.85:1 |
| White text | 5.44:1 |
Values
| HEX | #555CD3 |
| RGB | rgb(85, 92, 211) |
| HSL | hsl(237, 59%, 58%) |
| OKLCH | oklch(53.6% 0.18 275.9) |
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 #555CD3 | 5.44:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #555CD3 | 3.85:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #555CD3 text on white | 5.44:1 | AA | Lc 76.8 | Fine for body text |
| #555CD3 text on black | 3.85:1 | AA large text | Lc -25.0 | 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 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B2BDF5
oklch(80.9% 0.08 275.8)
-
Step 400
400
#8B98F1
oklch(70.6% 0.131 276.2)
-
Step 500
500
#707CEC
oklch(63.1% 0.167 275.9)
-
Step 600
600 (this color)
#555CD3
oklch(53.6% 0.18 275.9)
-
Step 700
700
#4B51BD
oklch(49.2% 0.167 276)
-
Step 800
800
#3D4399
oklch(42.8% 0.138 275.9)
-
Step 900
900
#33397A
oklch(37.6% 0.109 275.9)
-
Step 950
950
#1E2247
oklch(27% 0.068 276.2)
#555CD3 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) | #006FD7 | 0.067 |
| Deuteranopia (no green cones) | #0064D1 | 0.062 |
| Tritanopia (no blue cones) | #00788E | 0.155 |
| Achromatopsia (no color) | #6A6A6A | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555CD3
#555CD3
oklch(53.6% 0.18 275.9)
- #816C00
#816C00
oklch(53.6% 0.11 95.5)
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 #555CD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.023
- Dark Periwinkle #665FD1 ΔE 0.027
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.032
- Light Indigo #6D5ACF ΔE 0.036
- Royal Blue #4169E1 ΔE 0.040
- Neon Blue #4361EE ΔE 0.046
- Bluey Purple #6241C7 ΔE 0.062
Use #555CD3 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.