#646C5B
Closest named color: Dim Gray (#696969). oklch(51.9% 0.028 127.9), rgb(100, 108, 91).
Aa
White text reads best on this color (5.47:1).
About this color
#646C5B is a medium-dark close to neutral grey. In OKLCH its lightness is 52%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.028 away. White text reads best on it, at 5.47:1.
| Hue family | Neutrals |
| Lightness | medium-dark (52%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #646C5B |
| RGB | rgb(100, 108, 91) |
| HSL | hsl(88, 9%, 39%) |
| OKLCH | oklch(51.9% 0.028 127.9) |
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 #646C5B | 5.47:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #646C5B | 3.83:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #646C5B text on white | 5.47:1 | AA | Lc 77.3 | Fine for body text |
| #646C5B text on black | 3.83:1 | AA large text | Lc -24.4 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE8
oklch(93.6% 0.003 128.5)
-
Step 200
200
#D8DAD5
oklch(88.5% 0.007 124.5)
-
Step 300
300
#BEC2B9
oklch(80.8% 0.013 126.4)
-
Step 400
400
#9DA395
oklch(70.7% 0.021 125.9)
-
Step 500
500
#858D7B
oklch(63.2% 0.028 126.8)
-
Step 600
600
#6E7764
oklch(55.6% 0.031 128.1)
-
Step 700
700 (this color)
#646C5B
oklch(51.9% 0.028 127.9)
-
Step 800
800
#4B5244
oklch(42.8% 0.024 129.1)
-
Step 900
900
#3F4439
oklch(37.8% 0.019 127.3)
-
Step 950
950
#252822
oklch(27.2% 0.012 128.9)
#646C5B 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) | #6E6A5A | 0.015 |
| Deuteranopia (no green cones) | #6D695C | 0.016 |
| Tritanopia (no blue cones) | #656A67 | 0.022 |
| Achromatopsia (no color) | #696969 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646C5B
#646C5B
oklch(51.9% 0.028 127.9)
- #6D6575
#6D6575
oklch(52% 0.027 307.9)
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 #646C5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.028
- Dark Taupe #7F684E ΔE 0.043
- Grey Brown #7F7053 ΔE 0.046
- Dark Moss Green #606C38 ΔE 0.050
- Battleship Gray #6C757D ΔE 0.054
- Slate #516572 ΔE 0.054
- Dull Brown #876E4B ΔE 0.059
- Dirt Brown #836539 ΔE 0.060
Use #646C5B 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.