@Tutanota personally i’m a brave search kinda girl.
independent index, no ties to google (unless you let it) or bing unlike most of these
ai is optional (you don’t have to add “-ai” every time, i switched it off once first use and never saw it again)
and it brings up the convert tool quickly when you search what something is in a different unit of measurement, like so (only SE other than google i know of that does that):
