#555FA8
Closest named color: French Blue (#436BAD). oklch(51.2% 0.116 275.7), rgb(85, 95, 168).
Aa
White text reads best on this color (5.85:1).
About this color
#555FA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.116 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.036 away. White text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #555FA8 |
| RGB | rgb(85, 95, 168) |
| HSL | hsl(233, 33%, 50%) |
| OKLCH | oklch(51.2% 0.116 275.7) |
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 #555FA8 | 5.85:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #555FA8 | 3.58:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #555FA8 text on white | 5.85:1 | AA | Lc 79.1 | Fine for body text |
| #555FA8 text on black | 3.58:1 | AA large text | Lc -22.7 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D3D8EE
oklch(88.5% 0.031 275.6)
-
Step 300
300
#B6BEE5
oklch(80.8% 0.056 276)
-
Step 400
400
#919CD9
oklch(70.7% 0.09 276)
-
Step 500
500
#7683CE
oklch(63.1% 0.114 275.2)
-
Step 600
600
#606BBB
oklch(55.6% 0.124 275.7)
-
Step 700
700 (this color)
#555FA8
oklch(51.2% 0.116 275.7)
-
Step 800
800
#414983
oklch(42.7% 0.096 275.6)
-
Step 900
900
#373D69
oklch(37.6% 0.075 276.3)
-
Step 950
950
#20243D
oklch(26.9% 0.047 275.9)
#555FA8 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) | #4268AB | 0.031 |
| Deuteranopia (no green cones) | #3A62A6 | 0.033 |
| Tritanopia (no blue cones) | #356E7B | 0.102 |
| Achromatopsia (no color) | #656565 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555FA8
#555FA8
oklch(51.2% 0.116 275.7)
- #796500
#796500
oklch(51.1% 0.105 95.4)
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 #555FA8, closest first.
No curated palette has a color within ΔE 0.04 of #555FA8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.036
- Dusky Blue #475F94 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.051
- Mid Blue #276AB3 ΔE 0.052
- Iris #6258C4 ΔE 0.053
- Twilight #4E518B ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.059
- Denim #3B638C ΔE 0.060
Use #555FA8 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.