#647CBE
Closest named color: Cool Blue (#4984B8). oklch(59.6% 0.105 268), rgb(100, 124, 190).
Aa
Black text reads best on this color (5.16:1).
About this color
#647CBE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.105 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.038 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #647CBE |
| RGB | rgb(100, 124, 190) |
| HSL | hsl(224, 41%, 57%) |
| OKLCH | oklch(59.6% 0.105 268) |
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 #647CBE | 4.06:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #647CBE | 5.16:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #647CBE text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #647CBE text on black | 5.16:1 | AA | Lc -33.9 | 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
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E3
oklch(80.9% 0.052 268)
-
Step 400
400
#8A9FD5
oklch(70.7% 0.083 267.8)
-
Step 500
500 (this color)
#647CBE
oklch(59.6% 0.105 268)
-
Step 600
600
#566FB6
oklch(55.5% 0.115 267.9)
-
Step 700
700
#475D9D
oklch(49.2% 0.106 268)
-
Step 800
800
#3A4C7F
oklch(42.7% 0.088 267.9)
-
Step 900
900
#324066
oklch(37.8% 0.068 267.7)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#647CBE 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) | #6382C1 | 0.016 |
| Deuteranopia (no green cones) | #5A7ABD | 0.014 |
| Tritanopia (no blue cones) | #418A94 | 0.094 |
| Achromatopsia (no color) | #7E7E7E | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647CBE
#647CBE
oklch(59.6% 0.105 268)
- #997B28
#997B28
oklch(59.6% 0.105 88.3)
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 #647CBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.038
- Steel Blue #4682B4 ΔE 0.041
- Off Blue #5684AE ΔE 0.041
- Dusty Blue #5A86AD ΔE 0.045
- Faded Blue #658CBB ΔE 0.047
- Windows Blue #3778BF ΔE 0.050
- Stormy Blue #507B9C ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.063
Use #647CBE 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.