#646171
Closest named color: Slate (#516572). oklch(50.1% 0.025 294.1), rgb(100, 97, 113).
Aa
White text reads best on this color (6.01:1).
About this color
#646171 is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.029 away. White text reads best on it, at 6.01:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.49:1 |
| White text | 6.01:1 |
Values
| HEX | #646171 |
| RGB | rgb(100, 97, 113) |
| HSL | hsl(251, 8%, 41%) |
| OKLCH | oklch(50.1% 0.025 294.1) |
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 #646171 | 6.01:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #646171 | 3.49:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #646171 text on white | 6.01:1 | AA | Lc 80.1 | Fine for body text |
| #646171 text on black | 3.49:1 | AA large text | Lc -21.7 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#D9D8DD
oklch(88.4% 0.007 295.4)
-
Step 300
300
#C1BFC8
oklch(80.9% 0.013 296.3)
-
Step 400
400
#A19EAC
oklch(70.6% 0.02 295.7)
-
Step 500
500
#8A8798
oklch(63.2% 0.025 293.8)
-
Step 600
600
#747182
oklch(55.7% 0.026 293.6)
-
Step 700
700 (this color)
#646171
oklch(50.1% 0.025 294.1)
-
Step 800
800
#4F4D5A
oklch(42.7% 0.021 292.5)
-
Step 900
900
#42404A
oklch(37.7% 0.017 294.7)
-
Step 950
950
#27262B
oklch(27.2% 0.009 294.9)
#646171 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) | #5E6372 | 0.010 |
| Deuteranopia (no green cones) | #5E6371 | 0.010 |
| Tritanopia (no blue cones) | #626366 | 0.021 |
| Achromatopsia (no color) | #636363 | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646171
#646171
oklch(50.1% 0.025 294.1)
- #636555
#636555
oklch(50% 0.025 113.1)
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 #646171, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.029
- Dim Gray #696969 ΔE 0.032
- Dusty Grape #545775 ΔE 0.043
- YInMn Blue #415A77 ΔE 0.058
- Battleship Gray #6C757D ΔE 0.060
- Metallic Blue #4F738E ΔE 0.061
- Dull Purple #84597E ΔE 0.063
- Dusty Purple #825F87 ΔE 0.063
Use #646171 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.