#647CC5
Closest named color: Cool Blue (#4984B8). oklch(60% 0.115 269), rgb(100, 124, 197).
Aa
Black text reads best on this color (5.23:1).
About this color
#647CC5 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 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.23:1 |
| White text | 4.01:1 |
Values
| HEX | #647CC5 |
| RGB | rgb(100, 124, 197) |
| HSL | hsl(225, 46%, 58%) |
| OKLCH | oklch(60% 0.115 269) |
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 #647CC5 | 4.01:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #647CC5 | 5.23:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #647CC5 text on white | 4.01:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #647CC5 text on black | 5.23:1 | AA | Lc -34.3 | 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
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#899ED9
oklch(70.6% 0.09 269)
-
Step 500
500 (this color)
#647CC5
oklch(60% 0.115 269)
-
Step 600
600
#556EBC
oklch(55.6% 0.125 268.7)
-
Step 700
700
#465CA2
oklch(49.2% 0.115 268.8)
-
Step 800
800
#394B84
oklch(42.7% 0.097 268.8)
-
Step 900
900
#313F69
oklch(37.7% 0.074 268.7)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#647CC5 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) | #6083C8 | 0.019 |
| Deuteranopia (no green cones) | #567BC3 | 0.018 |
| Tritanopia (no blue cones) | #3C8B97 | 0.102 |
| Achromatopsia (no color) | #7F7F7F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647CC5
#647CC5
oklch(60% 0.115 269)
- #9C7C19
#9C7C19
oklch(60.1% 0.115 89.1)
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 #647CC5, 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 0.047
- Off Blue #5684AE ΔE 0.050
- Windows Blue #3778BF ΔE 0.051
- Faded Blue #658CBB ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.053
- Soft Blue #6488EA ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.063
Use #647CC5 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.