#555BA9
Closest named color: Dusky Blue (#475F94). oklch(50.5% 0.123 277.7), rgb(85, 91, 169).
Aa
White text reads best on this color (6.07:1).
About this color
#555BA9 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 6.07:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #555BA9 |
| RGB | rgb(85, 91, 169) |
| HSL | hsl(236, 33%, 50%) |
| OKLCH | oklch(50.5% 0.123 277.7) |
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 #555BA9 | 6.07:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #555BA9 | 3.45:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #555BA9 text on white | 6.07:1 | AA | Lc 80.2 | Fine for body text |
| #555BA9 text on black | 3.45:1 | AA large text | Lc -21.6 | 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
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B7BEE7
oklch(81% 0.058 277.4)
-
Step 400
400
#929BDC
oklch(70.7% 0.096 277.6)
-
Step 500
500
#7881D2
oklch(63.1% 0.122 277.5)
-
Step 600
600
#6269BF
oklch(55.6% 0.132 277.7)
-
Step 700
700 (this color)
#555BA9
oklch(50.5% 0.123 277.7)
-
Step 800
800
#434885
oklch(42.8% 0.1 277.7)
-
Step 900
900
#383C6B
oklch(37.6% 0.08 278.1)
-
Step 950
950
#21243F
oklch(27.2% 0.05 277.7)
#555BA9 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) | #3A66AC | 0.040 |
| Deuteranopia (no green cones) | #335FA7 | 0.041 |
| Tritanopia (no blue cones) | #356C7A | 0.108 |
| Achromatopsia (no color) | #626262 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555BA9
#555BA9
oklch(50.5% 0.123 277.7)
- #756400
#756400
oklch(50.4% 0.104 97.5)
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 #555BA9, closest first.
No curated palette has a color within ΔE 0.04 of #555BA9.
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 0.045
- Iris #6258C4 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.052
- Twilight #4E518B ΔE 0.053
- Mid Blue #276AB3 ΔE 0.057
- Denim #3B638C ΔE 0.065
- Slate Blue #6A5ACD ΔE 0.065
Use #555BA9 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.