#647CB9
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.098 267.1), rgb(100, 124, 185).
Aa
Black text reads best on this color (5.12:1).
About this color
#647CB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.098 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.035 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.12:1 |
| White text | 4.09:1 |
Values
| HEX | #647CB9 |
| RGB | rgb(100, 124, 185) |
| HSL | hsl(223, 38%, 56%) |
| OKLCH | oklch(59.4% 0.098 267.1) |
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 #647CB9 | 4.09:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #647CB9 | 5.12:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #647CB9 text on white | 4.09:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #647CB9 text on black | 5.12:1 | AA | Lc -33.6 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8BA0D1
oklch(70.8% 0.076 266.5)
-
Step 500
500 (this color)
#647CB9
oklch(59.4% 0.098 267.1)
-
Step 600
600
#5770B2
oklch(55.5% 0.107 267.2)
-
Step 700
700
#475E99
oklch(49.1% 0.099 266.7)
-
Step 800
800
#3B4D7C
oklch(42.8% 0.082 267.1)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#647CB9 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) | #6681BC | 0.014 |
| Deuteranopia (no green cones) | #5D7AB8 | 0.011 |
| Tritanopia (no blue cones) | #448992 | 0.088 |
| Achromatopsia (no color) | #7D7D7D | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647CB9
#647CB9
oklch(59.4% 0.098 267.1)
- #977A31
#977A31
oklch(59.3% 0.098 87.2)
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 #647CB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.035
- Off Blue #5684AE ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.039
- Faded Blue #658CBB ΔE 0.045
- Windows Blue #3778BF ΔE 0.050
- Stormy Blue #507B9C ΔE 0.053
- Cerulean #457B9D ΔE 0.059
Use #647CB9 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.