#555AA8
Closest named color: Dusky Blue (#475F94). oklch(50.2% 0.123 278.2), rgb(85, 90, 168).
Aa
White text reads best on this color (6.15:1).
About this color
#555AA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.123 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.042 away. White text reads best on it, at 6.15:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.41:1 |
| White text | 6.15:1 |
Values
| HEX | #555AA8 |
| RGB | rgb(85, 90, 168) |
| HSL | hsl(236, 33%, 50%) |
| OKLCH | oklch(50.2% 0.123 278.2) |
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 #555AA8 | 6.15:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #555AA8 | 3.41:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #555AA8 text on white | 6.15:1 | AA | Lc 80.5 | Fine for body text |
| #555AA8 text on black | 3.41:1 | AA large text | Lc -21.3 | 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 700.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D4D8EF
oklch(88.6% 0.032 277.9)
-
Step 300
300
#B7BEE7
oklch(81% 0.058 277.4)
-
Step 400
400
#939BDB
oklch(70.8% 0.094 278.2)
-
Step 500
500
#7981D2
oklch(63.2% 0.122 278)
-
Step 600
600
#6369BF
oklch(55.7% 0.132 278.2)
-
Step 700
700 (this color)
#555AA8
oklch(50.2% 0.123 278.2)
-
Step 800
800
#434785
oklch(42.6% 0.102 278.4)
-
Step 900
900
#383C6B
oklch(37.6% 0.08 278.1)
-
Step 950
950
#21243F
oklch(27.2% 0.05 277.7)
#555AA8 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) | #3965AB | 0.041 |
| Deuteranopia (no green cones) | #325EA6 | 0.042 |
| Tritanopia (no blue cones) | #356B79 | 0.108 |
| Achromatopsia (no color) | #616161 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555AA8
#555AA8
oklch(50.2% 0.123 278.2)
- #746400
#746400
oklch(50.3% 0.104 98.2)
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 #555AA8, closest first.
No curated palette has a color within ΔE 0.04 of #555AA8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.042
- French Blue #436BAD ΔE 0.048
- Iris #6258C4 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.051
- Twilight #4E518B ΔE 0.051
- Mid Blue #276AB3 ΔE 0.059
- Dusk #4E5481 ΔE 0.064
- Denim #3B638C ΔE 0.065
Use #555AA8 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.