#555F73
Closest named color: Slate (#516572). oklch(48.5% 0.035 264.2), rgb(85, 95, 115).
Aa
White text reads best on this color (6.42:1).
About this color
#555F73 is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.035 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.019 away. White text reads best on it, at 6.42:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.27:1 |
| White text | 6.42:1 |
Values
| HEX | #555F73 |
| RGB | rgb(85, 95, 115) |
| HSL | hsl(220, 15%, 39%) |
| OKLCH | oklch(48.5% 0.035 264.2) |
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 #555F73 | 6.42:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #555F73 | 3.27:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #555F73 text on white | 6.42:1 | AA | Lc 81.9 | Fine for body text |
| #555F73 text on black | 3.27:1 | AA large text | Lc -20.0 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D6D9DF
oklch(88.5% 0.009 264.5)
-
Step 300
300
#BBC1CC
oklch(81% 0.017 262.7)
-
Step 400
400
#98A1B2
oklch(70.7% 0.027 263.3)
-
Step 500
500
#7F8A9F
oklch(63.2% 0.034 263.4)
-
Step 600
600
#68738A
oklch(55.5% 0.038 265)
-
Step 700
700 (this color)
#555F73
oklch(48.5% 0.035 264.2)
-
Step 800
800
#474F5F
oklch(42.7% 0.029 264.2)
-
Step 900
900
#3C424E
oklch(37.8% 0.022 264.3)
-
Step 950
950
#23262E
oklch(26.9% 0.016 269.1)
#555F73 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) | #596074 | 0.007 |
| Deuteranopia (no green cones) | #565D73 | 0.006 |
| Tritanopia (no blue cones) | #4D6366 | 0.030 |
| Achromatopsia (no color) | #5F5F5F | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555F73
#555F73
oklch(48.5% 0.035 264.2)
- #685E49
#685E49
oklch(48.5% 0.034 85.5)
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 #555F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.019
- Dusty Grape #545775 ΔE 0.026
- YInMn Blue #415A77 ΔE 0.034
- Dusk #4E5481 ΔE 0.047
- Denim #3B638C ΔE 0.048
- Dim Gray #696969 ΔE 0.050
- Dusky Blue #475F94 ΔE 0.056
- Metallic Blue #4F738E ΔE 0.062
Use #555F73 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.