#646E8A
Closest named color: Metallic Blue (#4F738E). oklch(54% 0.046 269.5), rgb(100, 110, 138).
Aa
White text reads best on this color (5.07:1).
About this color
#646E8A is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.046 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.028 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #646E8A |
| RGB | rgb(100, 110, 138) |
| HSL | hsl(224, 16%, 47%) |
| OKLCH | oklch(54% 0.046 269.5) |
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 #646E8A | 5.07:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #646E8A | 4.13:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #646E8A text on white | 5.07:1 | AA | Lc 75.0 | Fine for body text |
| #646E8A text on black | 4.13:1 | AA large text | Lc -26.7 | 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 600.
-
Step 50
50
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E1
oklch(88.5% 0.011 269.5)
-
Step 300
300
#BBC0CE
oklch(80.8% 0.02 270.2)
-
Step 400
400
#98A0B6
oklch(70.7% 0.033 269.7)
-
Step 500
500
#7F89A4
oklch(63.1% 0.042 269.2)
-
Step 600
600 (this color)
#646E8A
oklch(54% 0.046 269.5)
-
Step 700
700
#576079
oklch(49.1% 0.042 269.4)
-
Step 800
800
#474E63
oklch(42.6% 0.036 270.4)
-
Step 900
900
#3C4151
oklch(37.7% 0.028 271.4)
-
Step 950
950
#23262F
oklch(26.9% 0.017 270.7)
#646E8A 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) | #65708B | 0.006 |
| Deuteranopia (no green cones) | #626D89 | 0.004 |
| Tritanopia (no blue cones) | #5A7377 | 0.041 |
| Achromatopsia (no color) | #6E6E6E | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646E8A
#646E8A
oklch(54% 0.046 269.5)
- #796E50
#796E50
oklch(54% 0.046 90.3)
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 #646E8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.028
- Battleship Gray #6C757D ΔE 0.036
- Dull Blue #49759C ΔE 0.041
- Grey Blue #647D8E ΔE 0.043
- Stormy Blue #507B9C ΔE 0.044
- Grey Purple #826D8C ΔE 0.046
- Battleship Grey #6B7C85 ΔE 0.047
- Dim Gray #696969 ΔE 0.050
Use #646E8A 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.