#646E93
Closest named color: Metallic Blue (#4F738E). oklch(54.4% 0.059 272.6), rgb(100, 110, 147).
Aa
White text reads best on this color (5.00:1).
About this color
#646E93 is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.059 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.032 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #646E93 |
| RGB | rgb(100, 110, 147) |
| HSL | hsl(227, 19%, 48%) |
| OKLCH | oklch(54.4% 0.059 272.6) |
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 #646E93 | 5.00:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #646E93 | 4.19:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #646E93 text on white | 5.00:1 | AA | Lc 74.6 | Content text, not long reading |
| #646E93 text on black | 4.19:1 | AA large text | Lc -27.1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D6D9E3
oklch(88.6% 0.014 272.7)
-
Step 300
300
#BAC0D2
oklch(80.9% 0.026 271.1)
-
Step 400
400
#979FBC
oklch(70.6% 0.043 273.1)
-
Step 500
500
#7E88AB
oklch(63.1% 0.054 272.3)
-
Step 600
600 (this color)
#646E93
oklch(54.4% 0.059 272.6)
-
Step 700
700
#565F80
oklch(49.1% 0.054 272.5)
-
Step 800
800
#464E68
oklch(42.8% 0.045 271.2)
-
Step 900
900
#3B4155
oklch(37.8% 0.035 271.6)
-
Step 950
950
#232632
oklch(27.1% 0.023 273.8)
#646E93 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) | #637195 | 0.008 |
| Deuteranopia (no green cones) | #5F6D92 | 0.008 |
| Tritanopia (no blue cones) | #57757B | 0.053 |
| Achromatopsia (no color) | #6F6F6F | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646E93
#646E93
oklch(54.4% 0.059 272.6)
- #7C6F47
#7C6F47
oklch(54.4% 0.059 92.1)
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 #646E93, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- Stormy Blue #507B9C ΔE 0.041
- Grey Purple #826D8C ΔE 0.046
- Battleship Gray #6C757D ΔE 0.047
- Grey Blue #647D8E ΔE 0.047
- Cerulean #457B9D ΔE 0.047
- Muted Blue #3B719F ΔE 0.049
Use #646E93 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.