Google Maps nowadays shows "areas of interest" in pale orange. (Source.) As far as I can tell, "areas of interest" are basically just high-density commercial districts.
I think it makes sense to show commercial zones in their own color. It's definitely more interesting to walk through a busy area such as Times Square than through a quiet residential street on Staten Island. In fact, even low-density commercial areas are probably more interesting to walk through than residential areas.
You might say, "well, just walk along arterial roads". But this doesn't always help. In my city, large parts of many arterial roads are zoned for residential use (e.g. mid-rise apartments and condos) rather than for commercial or mixed use.
Google Maps does color-coding of "areas of interest" reasonably well. It's true that pale orange is a little bit hard to see at low zoom levels on a low-resolution cellphone; but this is just a minor quibble. Still, I wonder who else shows these areas; maybe one of Google's competitors does a bit better at showing where these districts can be found.
Is there any map website, other than Google Maps, which can use color-coding to show me where commercial areas are?
The website must be free for personal use, since I don't want to pay money to use it.
On second thought, the official Toronto zoning map is definitely a fine option. (The middle of another post explains how to read the map.) I think I like the fact that it shows all commercial zones: even low-density ones like the ones on Marlee Avenue. Of course, it only covers Toronto, Canada; but it still meets my needs fine.