#647EA6
Closest named color: Off Blue (#5684AE). oklch(58.9% 0.069 258.8), rgb(100, 126, 166).
Aa
Black text reads best on this color (5.07:1).
About this color
#647EA6 is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.069 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.022 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #647EA6 |
| RGB | rgb(100, 126, 166) |
| HSL | hsl(216, 27%, 52%) |
| OKLCH | oklch(58.9% 0.069 258.8) |
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 #647EA6 | 4.13:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #647EA6 | 5.07:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #647EA6 text on white | 4.13:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #647EA6 text on black | 5.07:1 | AA | Lc -33.2 | 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
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B5C2D5
oklch(81% 0.03 257.8)
-
Step 400
400
#8EA2C0
oklch(70.7% 0.05 258.4)
-
Step 500
500
#728BB0
oklch(63.1% 0.063 258.1)
-
Step 600
600 (this color)
#647EA6
oklch(58.9% 0.069 258.8)
-
Step 700
700
#4A6285
oklch(49.2% 0.064 257.7)
-
Step 800
800
#3D506C
oklch(42.8% 0.053 257.9)
-
Step 900
900
#344258
oklch(37.6% 0.042 259.3)
-
Step 950
950
#1F2733
oklch(27.1% 0.025 258.3)
#647EA6 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) | #7080A8 | 0.018 |
| Deuteranopia (no green cones) | #687AA5 | 0.012 |
| Tritanopia (no blue cones) | #4E878C | 0.061 |
| Achromatopsia (no color) | #7D7D7D | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647EA6
#647EA6
oklch(58.9% 0.069 258.8)
- #93784D
#93784D
oklch(58.8% 0.068 78.5)
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 #647EA6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.022
- Dusty Blue #5A86AD ΔE 0.024
- Stormy Blue #507B9C ΔE 0.031
- Steel Blue #4682B4 ΔE 0.036
- Grey Blue #647D8E ΔE 0.037
- Cool Blue #4984B8 ΔE 0.037
- Slate Gray #708090 ΔE 0.039
- Lavender Gray #7E7F9A ΔE 0.040
Use #647EA6 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.