#647BC4
Closest named color: Cool Blue (#4984B8). oklch(59.7% 0.115 269.5), rgb(100, 123, 196).
Aa
Black text reads best on this color (5.17:1).
About this color
#647BC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.115 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.044 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #647BC4 |
| RGB | rgb(100, 123, 196) |
| HSL | hsl(226, 45%, 58%) |
| OKLCH | oklch(59.7% 0.115 269.5) |
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 #647BC4 | 4.06:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #647BC4 | 5.17:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #647BC4 text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #647BC4 text on black | 5.17:1 | AA | Lc -34.0 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8A9ED9
oklch(70.6% 0.09 269.6)
-
Step 500
500 (this color)
#647BC4
oklch(59.7% 0.115 269.5)
-
Step 600
600
#566EBC
oklch(55.6% 0.124 269.2)
-
Step 700
700
#475BA2
oklch(49% 0.116 269.9)
-
Step 800
800
#3A4B83
oklch(42.7% 0.095 269.3)
-
Step 900
900
#323F69
oklch(37.7% 0.074 269.6)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#647BC4 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) | #5F83C7 | 0.021 |
| Deuteranopia (no green cones) | #557AC2 | 0.019 |
| Tritanopia (no blue cones) | #3D8A96 | 0.102 |
| Achromatopsia (no color) | #7E7E7E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647BC4
#647BC4
oklch(59.7% 0.115 269.5)
- #9B7B18
#9B7B18
oklch(59.7% 0.115 89)
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 #647BC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.048
- Windows Blue #3778BF ΔE 0.050
- Off Blue #5684AE ΔE 0.050
- Faded Blue #658CBB ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.054
- Soft Blue #6488EA ΔE 0.062
- Water Blue #0E87CC ΔE 0.064
Use #647BC4 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.