#647BA5
Closest named color: Off Blue (#5684AE). oklch(58.2% 0.07 262.2), rgb(100, 123, 165).
Aa
Black text reads best on this color (4.91:1).
About this color
#647BA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.070 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.028 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.91:1 |
| White text | 4.26:1 |
Values
| HEX | #647BA5 |
| RGB | rgb(100, 123, 165) |
| HSL | hsl(219, 27%, 52%) |
| OKLCH | oklch(58.2% 0.07 262.2) |
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 #647BA5 | 4.26:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #647BA5 | 4.91:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #647BA5 text on white | 4.26:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #647BA5 text on black | 4.91:1 | AA | Lc -32.2 | 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 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B6C1D6
oklch(80.9% 0.032 263.5)
-
Step 400
400
#90A1C1
oklch(70.7% 0.051 263)
-
Step 500
500
#748AB1
oklch(63.1% 0.064 261.7)
-
Step 600
600 (this color)
#647BA5
oklch(58.2% 0.07 262.2)
-
Step 700
700
#4C6186
oklch(49.1% 0.065 261.4)
-
Step 800
800
#3F4F6D
oklch(42.7% 0.054 262.6)
-
Step 900
900
#354258
oklch(37.7% 0.042 260.8)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#647BA5 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) | #6C7EA7 | 0.014 |
| Deuteranopia (no green cones) | #6678A4 | 0.008 |
| Tritanopia (no blue cones) | #4F8489 | 0.064 |
| Achromatopsia (no color) | #7A7A7A | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647BA5
#647BA5
oklch(58.2% 0.07 262.2)
- #907749
#907749
oklch(58.2% 0.07 81.9)
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 #647BA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.028
- Stormy Blue #507B9C ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.031
- Steel Blue #4682B4 ΔE 0.038
- Grey Blue #647D8E ΔE 0.039
- Cerulean #457B9D ΔE 0.039
- Cool Blue #4984B8 ΔE 0.041
- Dull Blue #49759C ΔE 0.041
Use #647BA5 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.