#555ACB
Closest named color: Iris (#6258C4). oklch(52.6% 0.172 276.8), rgb(85, 90, 203).
Aa
White text reads best on this color (5.65:1).
About this color
#555ACB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.172 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.022 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #555ACB |
| RGB | rgb(85, 90, 203) |
| HSL | hsl(237, 53%, 56%) |
| OKLCH | oklch(52.6% 0.172 276.8) |
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 #555ACB | 5.65:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #555ACB | 3.71:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #555ACB text on white | 5.65:1 | AA | Lc 78.0 | Fine for body text |
| #555ACB text on black | 3.71:1 | AA large text | Lc -23.8 | 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF3
oklch(80.9% 0.077 276.4)
-
Step 400
400
#8D99ED
oklch(70.8% 0.123 276.6)
-
Step 500
500
#737DE7
oklch(63.2% 0.158 276.8)
-
Step 600
600 (this color)
#555ACB
oklch(52.6% 0.172 276.8)
-
Step 700
700
#4D52B9
oklch(49.2% 0.16 276.7)
-
Step 800
800
#3F4395
oklch(42.6% 0.132 277.1)
-
Step 900
900
#353A77
oklch(37.8% 0.103 276.8)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#555ACB 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) | #006CCF | 0.068 |
| Deuteranopia (no green cones) | #0062C9 | 0.064 |
| Tritanopia (no blue cones) | #00748A | 0.149 |
| Achromatopsia (no color) | #676767 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555ACB
#555ACB
oklch(52.6% 0.172 276.8)
- #7D6A00
#7D6A00
oklch(52.7% 0.109 96.7)
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 #555ACB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.022
- Warm Blue #4B57DB ΔE 0.030
- Dark Periwinkle #665FD1 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.031
- Light Indigo #6D5ACF ΔE 0.037
- Royal Blue #4169E1 ΔE 0.050
- Bluey Purple #6241C7 ΔE 0.056
- Neon Blue #4361EE ΔE 0.058
Use #555ACB 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.