#555AA4
Closest named color: Dusky Blue (#475F94). oklch(49.9% 0.117 278.4), rgb(85, 90, 164).
Aa
White text reads best on this color (6.20:1).
About this color
#555AA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.117 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.037 away. White text reads best on it, at 6.20:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.38:1 |
| White text | 6.20:1 |
Values
| HEX | #555AA4 |
| RGB | rgb(85, 90, 164) |
| HSL | hsl(236, 32%, 49%) |
| OKLCH | oklch(49.9% 0.117 278.4) |
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 #555AA4 | 6.20:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #555AA4 | 3.38:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #555AA4 text on white | 6.20:1 | AA | Lc 80.8 | Fine for body text |
| #555AA4 text on black | 3.38:1 | AA large text | Lc -21.1 | 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 700.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D8EE
oklch(88.6% 0.03 277.6)
-
Step 300
300
#B8BEE5
oklch(81% 0.055 278.2)
-
Step 400
400
#939BD9
oklch(70.7% 0.091 278.1)
-
Step 500
500
#7A81CE
oklch(63% 0.116 278.6)
-
Step 600
600
#646ABB
oklch(55.7% 0.125 278.3)
-
Step 700
700 (this color)
#555AA4
oklch(49.9% 0.117 278.4)
-
Step 800
800
#444883
oklch(42.8% 0.097 278.5)
-
Step 900
900
#393D69
oklch(37.8% 0.075 278.2)
-
Step 950
950
#21243D
oklch(27% 0.047 277.6)
#555AA4 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) | #3C64A7 | 0.038 |
| Deuteranopia (no green cones) | #365EA2 | 0.039 |
| Tritanopia (no blue cones) | #386A77 | 0.103 |
| Achromatopsia (no color) | #616161 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555AA4
#555AA4
oklch(49.9% 0.117 278.4)
- #736300
#736300
oklch(50% 0.103 98.1)
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 #555AA4, closest first.
No curated palette has a color within ΔE 0.04 of #555AA4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.037
- Twilight #4E518B ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.046
- French Blue #436BAD ΔE 0.048
- Iris #6258C4 ΔE 0.055
- Dusk #4E5481 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.060
- Denim #3B638C ΔE 0.060
Use #555AA4 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.