#647C93
Closest named color: Grey Blue (#647D8E). oklch(57.6% 0.045 247.5), rgb(100, 124, 147).
Aa
Black text reads best on this color (4.84:1).
About this color
#647C93 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.045 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.009 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #647C93 |
| RGB | rgb(100, 124, 147) |
| HSL | hsl(209, 19%, 48%) |
| OKLCH | oklch(57.6% 0.045 247.5) |
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 #647C93 | 4.33:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #647C93 | 4.84:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #647C93 text on white | 4.33:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #647C93 text on black | 4.84:1 | AA | Lc -31.7 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B7C2CD
oklch(80.9% 0.02 248.1)
-
Step 400
400
#91A3B4
oklch(70.7% 0.032 246.7)
-
Step 500
500
#768CA2
oklch(63.1% 0.042 248.5)
-
Step 600
600 (this color)
#647C93
oklch(57.6% 0.045 247.5)
-
Step 700
700
#4E6378
oklch(49.1% 0.042 248.7)
-
Step 800
800
#405161
oklch(42.7% 0.034 247.1)
-
Step 900
900
#364350
oklch(37.7% 0.028 248.6)
-
Step 950
950
#20272F
oklch(26.9% 0.018 251.9)
#647C93 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) | #737C94 | 0.021 |
| Deuteranopia (no green cones) | #6D7793 | 0.018 |
| Tritanopia (no blue cones) | #568183 | 0.038 |
| Achromatopsia (no color) | #797979 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647C93
#647C93
oklch(57.6% 0.045 247.5)
- #8C745D
#8C745D
oklch(57.6% 0.045 65.5)
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 #647C93, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.009
- Slate Gray #708090 ΔE 0.022
- Battleship Grey #6B7C85 ΔE 0.023
- Stormy Blue #507B9C ΔE 0.028
- Steel Grey #6F828A ΔE 0.030
- Battleship Gray #6C757D ΔE 0.034
- Steel #738595 ΔE 0.035
- Cerulean #457B9D ΔE 0.038
Use #647C93 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.