#646D9A
Closest named color: Dull Blue (#49759C). oklch(54.6% 0.071 275.1), rgb(100, 109, 154).
Aa
White text reads best on this color (5.00:1).
About this color
#646D9A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.071 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.038 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #646D9A |
| RGB | rgb(100, 109, 154) |
| HSL | hsl(230, 21%, 50%) |
| OKLCH | oklch(54.6% 0.071 275.1) |
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 #646D9A | 5.00:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #646D9A | 4.19:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #646D9A text on white | 5.00:1 | AA | Lc 74.6 | Content text, not long reading |
| #646D9A 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
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D5D8E5
oklch(88.4% 0.018 275.6)
-
Step 300
300
#BABFD6
oklch(80.8% 0.033 275.9)
-
Step 400
400
#979FC1
oklch(70.8% 0.05 274.7)
-
Step 500
500
#7E87B2
oklch(63.2% 0.066 275.2)
-
Step 600
600 (this color)
#646D9A
oklch(54.6% 0.071 275.1)
-
Step 700
700
#565E86
oklch(49.2% 0.065 275.1)
-
Step 800
800
#464D6D
oklch(42.8% 0.054 274.4)
-
Step 900
900
#3B4058
oklch(37.7% 0.042 275.1)
-
Step 950
950
#222534
oklch(26.8% 0.028 275.6)
#646D9A 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) | #5F729C | 0.015 |
| Deuteranopia (no green cones) | #5B6D99 | 0.013 |
| Tritanopia (no blue cones) | #55767D | 0.064 |
| Achromatopsia (no color) | #6F6F6F | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646D9A
#646D9A
oklch(54.6% 0.071 275.1)
- #7D703E
#7D703E
oklch(54.5% 0.071 95.2)
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 #646D9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.038
- Metallic Blue #4F738E ΔE 0.040
- Stormy Blue #507B9C ΔE 0.044
- Muted Blue #3B719F ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.049
- Grey Purple #826D8C ΔE 0.050
- Cerulean #457B9D ΔE 0.050
- French Blue #436BAD ΔE 0.051
Use #646D9A 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.