#646C94
Closest named color: Metallic Blue (#4F738E). oklch(54% 0.063 275.3), rgb(100, 108, 148).
Aa
White text reads best on this color (5.10:1).
About this color
#646C94 is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.063 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.036 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #646C94 |
| RGB | rgb(100, 108, 148) |
| HSL | hsl(230, 19%, 49%) |
| OKLCH | oklch(54% 0.063 275.3) |
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 #646C94 | 5.10:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #646C94 | 4.11:1 | AA large text | Lc 28.9 | Dividers and decoration only |
| #646C94 text on white | 5.10:1 | AA | Lc 75.2 | Fine for body text |
| #646C94 text on black | 4.11:1 | AA large text | Lc -26.5 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D6D8E4
oklch(88.4% 0.017 278.5)
-
Step 300
300
#BBC0D4
oklch(81% 0.029 274.6)
-
Step 400
400
#989FBE
oklch(70.7% 0.046 275.2)
-
Step 500
500
#7F87AD
oklch(63.1% 0.058 275.4)
-
Step 600
600 (this color)
#646C94
oklch(54% 0.063 275.3)
-
Step 700
700
#575E82
oklch(49.1% 0.058 275.5)
-
Step 800
800
#474D6A
oklch(42.7% 0.049 275.1)
-
Step 900
900
#3C4056
oklch(37.7% 0.038 276.4)
-
Step 950
950
#232632
oklch(27.1% 0.023 273.8)
#646C94 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) | #607096 | 0.012 |
| Deuteranopia (no green cones) | #5D6C93 | 0.010 |
| Tritanopia (no blue cones) | #57747A | 0.057 |
| Achromatopsia (no color) | #6E6E6E | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646C94
#646C94
oklch(54% 0.063 275.3)
- #7A6F43
#7A6F43
oklch(54.1% 0.064 95.8)
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 #646C94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.036
- Dull Blue #49759C ΔE 0.039
- Stormy Blue #507B9C ΔE 0.045
- Grey Purple #826D8C ΔE 0.048
- Muted Blue #3B719F ΔE 0.049
- Cerulean #457B9D ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.053
- Battleship Gray #6C757D ΔE 0.053
Use #646C94 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.