#647BC0
Closest named color: Cool Blue (#4984B8). oklch(59.5% 0.109 268.9), rgb(100, 123, 192).
Aa
Black text reads best on this color (5.13:1).
About this color
#647BC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.109 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.041 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.13:1 |
| White text | 4.08:1 |
Values
| HEX | #647BC0 |
| RGB | rgb(100, 123, 192) |
| HSL | hsl(225, 42%, 57%) |
| OKLCH | oklch(59.5% 0.109 268.9) |
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 #647BC0 | 4.08:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #647BC0 | 5.13:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #647BC0 text on white | 4.08:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #647BC0 text on black | 5.13:1 | AA | Lc -33.7 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8B9FD7
oklch(70.8% 0.085 269)
-
Step 500
500 (this color)
#647BC0
oklch(59.5% 0.109 268.9)
-
Step 600
600
#576FB9
oklch(55.7% 0.119 268.8)
-
Step 700
700
#475C9F
oklch(49.1% 0.11 269)
-
Step 800
800
#3A4B81
oklch(42.6% 0.092 269.1)
-
Step 900
900
#323F67
oklch(37.6% 0.071 269.2)
-
Step 950
950
#1D253D
oklch(26.9% 0.046 269.1)
#647BC0 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) | #6182C3 | 0.019 |
| Deuteranopia (no green cones) | #587ABE | 0.016 |
| Tritanopia (no blue cones) | #408A94 | 0.099 |
| Achromatopsia (no color) | #7D7D7D | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647BC0
#647BC0
oklch(59.5% 0.109 268.9)
- #997B22
#997B22
oklch(59.6% 0.109 89.2)
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 #647BC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.044
- Off Blue #5684AE ΔE 0.045
- Windows Blue #3778BF ΔE 0.049
- Dusty Blue #5A86AD ΔE 0.049
- Faded Blue #658CBB ΔE 0.050
- Stormy Blue #507B9C ΔE 0.064
- Flat Blue #3C73A8 ΔE 0.064
Use #647BC0 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.