#555BE4
Closest named color: Warm Blue (#4B57DB). oklch(54.7% 0.204 275.5), rgb(85, 91, 228).
Aa
White text reads best on this color (5.24:1).
About this color
#555BE4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.204 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.022 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #555BE4 |
| RGB | rgb(85, 91, 228) |
| HSL | hsl(237, 73%, 61%) |
| OKLCH | oklch(54.7% 0.204 275.5) |
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 #555BE4 | 5.24:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #555BE4 | 4.00:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #555BE4 text on white | 5.24:1 | AA | Lc 75.6 | Fine for body text |
| #555BE4 text on black | 4.00:1 | AA large text | Lc -26.2 | 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 600.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FC
oklch(88.5% 0.052 275.7)
-
Step 300
300
#AFBCFC
oklch(80.8% 0.092 275.3)
-
Step 400
400
#8897FB
oklch(70.8% 0.147 275.6)
-
Step 500
500
#6D79F8
oklch(63.1% 0.187 275.6)
-
Step 600
600 (this color)
#555BE4
oklch(54.7% 0.204 275.5)
-
Step 700
700
#484CC9
oklch(49.1% 0.19 275.5)
-
Step 800
800
#3B3FA2
oklch(42.6% 0.157 275.7)
-
Step 900
900
#313781
oklch(37.6% 0.123 275.3)
-
Step 950
950
#1D214B
oklch(27% 0.077 275.9)
#555BE4 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) | #0072E8 | 0.070 |
| Deuteranopia (no green cones) | #0066E1 | 0.061 |
| Tritanopia (no blue cones) | #007D97 | 0.170 |
| Achromatopsia (no color) | #6C6C6C | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555BE4
#555BE4
oklch(54.7% 0.204 275.5)
- #856F00
#856F00
oklch(54.7% 0.112 95.2)
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 #555BE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.022
- Neon Blue #4361EE ΔE 0.027
- Royal Blue #4169E1 ΔE 0.037
- Dark Periwinkle #665FD1 ΔE 0.040
- Slate Blue #6A5ACD ΔE 0.046
- Light Indigo #6D5ACF ΔE 0.047
- Iris #6258C4 ΔE 0.052
- Azul #1D5DEC ΔE 0.053
Use #555BE4 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.