#647EC9
Closest named color: Cool Blue (#4984B8). oklch(60.6% 0.118 268.3), rgb(100, 126, 201).
Aa
Black text reads best on this color (5.36:1).
About this color
#647EC9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.118 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.045 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #647EC9 |
| RGB | rgb(100, 126, 201) |
| HSL | hsl(225, 48%, 59%) |
| OKLCH | oklch(60.6% 0.118 268.3) |
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 #647EC9 | 3.91:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #647EC9 | 5.36:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #647EC9 text on white | 3.91:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #647EC9 text on black | 5.36:1 | AA | Lc -35.3 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B1C0E7
oklch(80.9% 0.058 268.6)
-
Step 400
400
#889FDB
oklch(70.8% 0.092 267.9)
-
Step 500
500 (this color)
#647EC9
oklch(60.6% 0.118 268.3)
-
Step 600
600
#536EBE
oklch(55.6% 0.128 268)
-
Step 700
700
#445CA4
oklch(49.2% 0.119 268)
-
Step 800
800
#384B85
oklch(42.7% 0.099 268.3)
-
Step 900
900
#303F6B
oklch(37.7% 0.078 268.3)
-
Step 950
950
#1C253E
oklch(26.9% 0.049 268)
#647EC9 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) | #6186CC | 0.021 |
| Deuteranopia (no green cones) | #567DC7 | 0.017 |
| Tritanopia (no blue cones) | #388E9A | 0.106 |
| Achromatopsia (no color) | #818181 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647EC9
#647EC9
oklch(60.6% 0.118 268.3)
- #9F7D14
#9F7D14
oklch(60.6% 0.118 88.4)
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 #647EC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.045
- Faded Blue #658CBB ΔE 0.049
- Steel Blue #4682B4 ΔE 0.050
- Off Blue #5684AE ΔE 0.052
- Soft Blue #6488EA ΔE 0.052
- Windows Blue #3778BF ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.057
Use #647EC9 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.