#647FB0
Closest named color: Off Blue (#5684AE). oklch(59.6% 0.082 261.9), rgb(100, 127, 176).
Aa
Black text reads best on this color (5.20:1).
About this color
#647FB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.082 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.021 away. Black text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #647FB0 |
| RGB | rgb(100, 127, 176) |
| HSL | hsl(219, 32%, 54%) |
| OKLCH | oklch(59.6% 0.082 261.9) |
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 #647FB0 | 4.03:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #647FB0 | 5.20:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #647FB0 text on white | 4.03:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #647FB0 text on black | 5.20:1 | AA | Lc -34.1 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D1DAE8
oklch(88.6% 0.022 259.2)
-
Step 300
300
#B3C1DB
oklch(80.9% 0.04 262.9)
-
Step 400
400
#8BA1C9
oklch(70.6% 0.064 262.3)
-
Step 500
500 (this color)
#647FB0
oklch(59.6% 0.082 261.9)
-
Step 600
600
#5673A8
oklch(55.6% 0.09 261.9)
-
Step 700
700
#466090
oklch(49% 0.084 262)
-
Step 800
800
#3A4F75
oklch(42.8% 0.069 261.7)
-
Step 900
900
#32425E
oklch(37.8% 0.053 261.3)
-
Step 950
950
#1D2637
oklch(26.8% 0.034 262.7)
#647FB0 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) | #6D82B2 | 0.015 |
| Deuteranopia (no green cones) | #657BAF | 0.011 |
| Tritanopia (no blue cones) | #498990 | 0.072 |
| Achromatopsia (no color) | #7E7E7E | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647FB0
#647FB0
oklch(59.6% 0.082 261.9)
- #977A43
#977A43
oklch(59.5% 0.082 82.1)
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 #647FB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.021
- Dusty Blue #5A86AD ΔE 0.024
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.032
- Faded Blue #658CBB ΔE 0.037
- Stormy Blue #507B9C ΔE 0.041
- Lavender Gray #7E7F9A ΔE 0.047
- Cerulean #457B9D ΔE 0.049
Use #647FB0 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.