#555F74
Closest named color: Slate (#516572). oklch(48.5% 0.036 265), rgb(85, 95, 116).
Aa
White text reads best on this color (6.41:1).
About this color
#555F74 is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.036 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.020 away. White text reads best on it, at 6.41:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #555F74 |
| RGB | rgb(85, 95, 116) |
| HSL | hsl(221, 15%, 39%) |
| OKLCH | oklch(48.5% 0.036 265) |
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 #555F74 | 6.41:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #555F74 | 3.27:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #555F74 text on white | 6.41:1 | AA | Lc 81.9 | Fine for body text |
| #555F74 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
#D6D9E0
oklch(88.5% 0.01 267.4)
-
Step 300
300
#BBC1CC
oklch(81% 0.017 262.7)
-
Step 400
400
#98A1B3
oklch(70.8% 0.028 264.4)
-
Step 500
500
#7F8AA0
oklch(63.2% 0.036 264.3)
-
Step 600
600
#68738B
oklch(55.5% 0.04 265.7)
-
Step 700
700 (this color)
#555F74
oklch(48.5% 0.036 265)
-
Step 800
800
#474F60
oklch(42.7% 0.03 265.3)
-
Step 900
900
#3B424E
oklch(37.7% 0.023 261.2)
-
Step 950
950
#23262E
oklch(26.9% 0.016 269.1)
#555F74 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) | #586075 | 0.006 |
| Deuteranopia (no green cones) | #565D74 | 0.006 |
| Tritanopia (no blue cones) | #4D6366 | 0.032 |
| Achromatopsia (no color) | #5F5F5F | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555F74
#555F74
oklch(48.5% 0.036 265)
- #685E48
#685E48
oklch(48.5% 0.036 86.4)
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 #555F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.020
- Dusty Grape #545775 ΔE 0.025
- YInMn Blue #415A77 ΔE 0.034
- Dusk #4E5481 ΔE 0.046
- Denim #3B638C ΔE 0.046
- Dim Gray #696969 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.062
Use #555F74 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.