#555DDE
Closest named color: Warm Blue (#4B57DB). oklch(54.6% 0.194 275.3), rgb(85, 93, 222).
Aa
White text reads best on this color (5.24:1).
About this color
#555DDE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.194 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.021 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.194) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #555DDE |
| RGB | rgb(85, 93, 222) |
| HSL | hsl(236, 67%, 60%) |
| OKLCH | oklch(54.6% 0.194 275.3) |
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 #555DDE | 5.24:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #555DDE | 4.00:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #555DDE text on white | 5.24:1 | AA | Lc 75.6 | Fine for body text |
| #555DDE text on black | 4.00:1 | AA large text | Lc -26.1 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#B0BDF9
oklch(81% 0.086 274.8)
-
Step 400
400
#8898F6
oklch(70.7% 0.138 275)
-
Step 500
500
#6D7BF3
oklch(63.1% 0.178 275.1)
-
Step 600
600 (this color)
#555DDE
oklch(54.6% 0.194 275.3)
-
Step 700
700
#484EC4
oklch(49% 0.181 275.3)
-
Step 800
800
#3B419E
oklch(42.6% 0.149 275.3)
-
Step 900
900
#32387E
oklch(37.7% 0.117 275.6)
-
Step 950
950
#1D224A
oklch(27.1% 0.074 275)
#555DDE 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) | #0072E2 | 0.068 |
| Deuteranopia (no green cones) | #0066DB | 0.060 |
| Tritanopia (no blue cones) | #007C94 | 0.164 |
| Achromatopsia (no color) | #6C6C6C | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555DDE
#555DDE
oklch(54.6% 0.194 275.3)
- #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 #555DDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.021
- Neon Blue #4361EE ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.032
- Royal Blue #4169E1 ΔE 0.033
- Slate Blue #6A5ACD ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.041
- Iris #6258C4 ΔE 0.044
- Azul #1D5DEC ΔE 0.056
Use #555DDE 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.