#555DF3
Closest named color: Neon Blue (#4361EE). oklch(56.3% 0.221 274.5), rgb(85, 93, 243).
Aa
White text reads best on this color (4.94:1).
About this color
#555DF3 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.221 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.023 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.221) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #555DF3 |
| RGB | rgb(85, 93, 243) |
| HSL | hsl(237, 87%, 64%) |
| OKLCH | oklch(56.3% 0.221 274.5) |
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 #555DF3 | 4.94:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #555DF3 | 4.24:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #555DF3 text on white | 4.94:1 | AA | Lc 73.7 | Content text, not long reading |
| #555DF3 text on black | 4.24:1 | AA large text | Lc -28.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CED7FE
oklch(88.5% 0.055 275)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600 (this color)
#555DF3
oklch(56.3% 0.221 274.5)
-
Step 700
700
#4549D2
oklch(49.2% 0.206 274.6)
-
Step 800
800
#383DA9
oklch(42.6% 0.17 274.5)
-
Step 900
900
#2F3686
oklch(37.7% 0.132 274.4)
-
Step 950
950
#1B204E
oklch(26.8% 0.084 274.6)
#555DF3 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) | #0077F8 | 0.071 |
| Deuteranopia (no green cones) | #0069F0 | 0.058 |
| Tritanopia (no blue cones) | #00839F | 0.182 |
| Achromatopsia (no color) | #707070 | 0.221 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555DF3
#555DF3
oklch(56.3% 0.221 274.5)
- #8B7300
#8B7300
oklch(56.2% 0.115 94.4)
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 #555DF3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.023
- Warm Blue #4B57DB ΔE 0.042
- Royal Blue #4169E1 ΔE 0.043
- Azul #1D5DEC ΔE 0.053
- Bright Blue #0165FC ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.061
- Medium Slate Blue #7B68EE ΔE 0.064
Use #555DF3 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.