#646899
Closest named color: Dull Blue (#49759C). oklch(53.4% 0.077 279.9), rgb(100, 104, 153).
Aa
White text reads best on this color (5.27:1).
About this color
#646899 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.077 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.046 away. White text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 3.98:1 |
| White text | 5.27:1 |
Values
| HEX | #646899 |
| RGB | rgb(100, 104, 153) |
| HSL | hsl(235, 21%, 50%) |
| OKLCH | oklch(53.4% 0.077 279.9) |
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 #646899 | 5.27:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #646899 | 3.98:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #646899 text on white | 5.27:1 | AA | Lc 76.2 | Fine for body text |
| #646899 text on black | 3.98:1 | AA large text | Lc -25.6 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D6D8E6
oklch(88.5% 0.019 279.5)
-
Step 300
300
#BCBFD7
oklch(81% 0.034 280)
-
Step 400
400
#999DC3
oklch(70.6% 0.056 280.2)
-
Step 500
500
#8185B4
oklch(63.1% 0.071 280.4)
-
Step 600
600 (this color)
#646899
oklch(53.4% 0.077 279.9)
-
Step 700
700
#595C89
oklch(49.1% 0.072 280.5)
-
Step 800
800
#484B6F
oklch(42.6% 0.06 279.9)
-
Step 900
900
#3C3F5A
oklch(37.7% 0.046 279)
-
Step 950
950
#232535
oklch(27% 0.03 278.7)
#646899 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) | #596E9B | 0.021 |
| Deuteranopia (no green cones) | #566A98 | 0.020 |
| Tritanopia (no blue cones) | #56717A | 0.066 |
| Achromatopsia (no color) | #6C6C6C | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646899
#646899
oklch(53.4% 0.077 279.9)
- #776E36
#776E36
oklch(53.4% 0.077 100.3)
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 #646899, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.046
- Metallic Blue #4F738E ΔE 0.048
- French Blue #436BAD ΔE 0.049
- Dusky Blue #475F94 ΔE 0.050
- Muted Blue #3B719F ΔE 0.051
- Dark Lavender #856798 ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.053
- Dusty Purple #825F87 ΔE 0.055
Use #646899 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.