#646B83
Closest named color: Metallic Blue (#4F738E). oklch(53.1% 0.039 272.3), rgb(100, 107, 131).
Aa
White text reads best on this color (5.28:1).
About this color
#646B83 is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.039 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.034 away. White text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #646B83 |
| RGB | rgb(100, 107, 131) |
| HSL | hsl(226, 13%, 45%) |
| OKLCH | oklch(53.1% 0.039 272.3) |
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 #646B83 | 5.28:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #646B83 | 3.97:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #646B83 text on white | 5.28:1 | AA | Lc 76.3 | Fine for body text |
| #646B83 text on black | 3.97:1 | AA large text | Lc -25.5 | 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 600.
-
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
#D7D9E0
oklch(88.6% 0.01 273.3)
-
Step 300
300
#BCC0CC
oklch(80.8% 0.017 271.2)
-
Step 400
400
#9AA0B3
oklch(70.7% 0.028 271.7)
-
Step 500
500
#8289A0
oklch(63.2% 0.035 272)
-
Step 600
600 (this color)
#646B83
oklch(53.1% 0.039 272.3)
-
Step 700
700
#596076
oklch(49.1% 0.036 271.2)
-
Step 800
800
#494E60
oklch(42.6% 0.031 272.9)
-
Step 900
900
#3D414E
oklch(37.7% 0.023 271.8)
-
Step 950
950
#24262E
oklch(27% 0.015 274.3)
#646B83 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) | #646D84 | 0.006 |
| Deuteranopia (no green cones) | #626A82 | 0.004 |
| Tritanopia (no blue cones) | #5C6F73 | 0.034 |
| Achromatopsia (no color) | #6C6C6C | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646B83
#646B83
oklch(53.1% 0.039 272.3)
- #746C53
#746C53
oklch(53.2% 0.038 92.4)
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 #646B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.034
- Battleship Gray #6C757D ΔE 0.037
- Dim Gray #696969 ΔE 0.040
- Slate #516572 ΔE 0.042
- Dull Blue #49759C ΔE 0.049
- Grey Purple #826D8C ΔE 0.050
- Grey Blue #647D8E ΔE 0.051
- Battleship Grey #6B7C85 ΔE 0.052
Use #646B83 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.