#55657F
Closest named color: Slate (#516572). oklch(50.4% 0.046 260), rgb(85, 101, 127).
Aa
White text reads best on this color (5.90:1).
About this color
#55657F is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.046 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.023 away. White text reads best on it, at 5.90:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.55:1 |
| White text | 5.90:1 |
Values
| HEX | #55657F |
| RGB | rgb(85, 101, 127) |
| HSL | hsl(217, 20%, 42%) |
| OKLCH | oklch(50.4% 0.046 260) |
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 #55657F | 5.90:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #55657F | 3.55:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #55657F text on white | 5.90:1 | AA | Lc 79.5 | Fine for body text |
| #55657F text on black | 3.55:1 | AA large text | Lc -22.3 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E1
oklch(88.4% 0.012 259.8)
-
Step 300
300
#B8C1CF
oklch(80.8% 0.022 259.2)
-
Step 400
400
#94A1B7
oklch(70.6% 0.035 261)
-
Step 500
500
#7A8AA6
oklch(63.1% 0.046 261.6)
-
Step 600
600
#627491
oklch(55.5% 0.05 259.9)
-
Step 700
700 (this color)
#55657F
oklch(50.4% 0.046 260)
-
Step 800
800
#435064
oklch(42.8% 0.037 258.9)
-
Step 900
900
#384252
oklch(37.7% 0.031 259.7)
-
Step 950
950
#212730
oklch(27.1% 0.019 258.4)
#55657F 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) | #5C6680 | 0.011 |
| Deuteranopia (no green cones) | #58627E | 0.009 |
| Tritanopia (no blue cones) | #496A6E | 0.039 |
| Achromatopsia (no color) | #646464 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55657F
#55657F
oklch(50.4% 0.046 260)
- #726246
#726246
oklch(50.4% 0.046 81.3)
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 #55657F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.023
- Denim #3B638C ΔE 0.039
- Dusty Grape #545775 ΔE 0.041
- Metallic Blue #4F738E ΔE 0.041
- YInMn Blue #415A77 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.046
- Dim Gray #696969 ΔE 0.049
- Dusk #4E5481 ΔE 0.054
Use #55657F 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.