#647CBA
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.099 267.3), rgb(100, 124, 186).
Aa
Black text reads best on this color (5.13:1).
About this color
#647CBA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.099 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 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.13:1 |
| White text | 4.09:1 |
Values
| HEX | #647CBA |
| RGB | rgb(100, 124, 186) |
| HSL | hsl(223, 38%, 56%) |
| OKLCH | oklch(59.4% 0.099 267.3) |
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 #647CBA | 4.09:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #647CBA | 5.13:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #647CBA text on white | 4.09:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #647CBA 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8B9FD2
oklch(70.6% 0.078 267.8)
-
Step 500
500 (this color)
#647CBA
oklch(59.4% 0.099 267.3)
-
Step 600
600
#5770B3
oklch(55.6% 0.109 267.3)
-
Step 700
700
#475E9A
oklch(49.2% 0.1 266.9)
-
Step 800
800
#3B4D7D
oklch(42.8% 0.083 267.3)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#647CBA 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) | #6582BD | 0.017 |
| Deuteranopia (no green cones) | #5D7AB9 | 0.011 |
| Tritanopia (no blue cones) | #438992 | 0.090 |
| Achromatopsia (no color) | #7D7D7D | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647CBA
#647CBA
oklch(59.4% 0.099 267.3)
- #987A2F
#987A2F
oklch(59.4% 0.1 86.9)
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 #647CBA, 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 0.036
- Steel Blue #4682B4 ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.040
- Faded Blue #658CBB ΔE 0.045
- Windows Blue #3778BF ΔE 0.050
- Stormy Blue #507B9C ΔE 0.055
- Cerulean #457B9D ΔE 0.060
Use #647CBA 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.