#647A89
Closest named color: Grey Blue (#647D8E). oklch(56.7% 0.035 238), rgb(100, 122, 137).
Aa
Black text reads best on this color (4.68:1).
About this color
#647A89 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.035 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.010 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #647A89 |
| RGB | rgb(100, 122, 137) |
| HSL | hsl(204, 16%, 46%) |
| OKLCH | oklch(56.7% 0.035 238) |
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 #647A89 | 4.48:1 | AA large text | Lc -76.6 | Fine for body text |
| Black text on #647A89 | 4.68:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #647A89 text on white | 4.48:1 | AA large text | Lc 71.1 | Content text, not long reading |
| #647A89 text on black | 4.68:1 | AA | Lc -30.6 | 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
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B8C2CA
oklch(80.9% 0.016 241.8)
-
Step 400
400
#93A3AF
oklch(70.7% 0.025 240.2)
-
Step 500
500
#788D9B
oklch(63.2% 0.032 237.2)
-
Step 600
600 (this color)
#647A89
oklch(56.7% 0.035 238)
-
Step 700
700
#506471
oklch(49.2% 0.032 236.8)
-
Step 800
800
#42515C
oklch(42.6% 0.026 240)
-
Step 900
900
#38434C
oklch(37.7% 0.021 243)
-
Step 950
950
#21272C
oklch(26.9% 0.013 243.3)
#647A89 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) | #73798A | 0.021 |
| Deuteranopia (no green cones) | #6E7589 | 0.019 |
| Tritanopia (no blue cones) | #597E7F | 0.027 |
| Achromatopsia (no color) | #777777 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647A89
#647A89
oklch(56.7% 0.035 238)
- #877263
#877263
oklch(56.8% 0.035 57.5)
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 #647A89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.010
- Battleship Grey #6B7C85 ΔE 0.014
- Battleship Gray #6C757D ΔE 0.021
- Slate Gray #708090 ΔE 0.026
- Steel Grey #6F828A ΔE 0.029
- Stormy Blue #507B9C ΔE 0.036
- Metallic Blue #4F738E ΔE 0.037
- Steel #738595 ΔE 0.041
Use #647A89 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.