CountChar
A little utility counting the characters in a text field

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CountChar is a little utility that can count the number of characters in a given string. Very simple to use. You paste your string into the top text field and CountChar immediately gives you the number of characters in that string.
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What makes CountChar even more useful is that it provides its basic functionality through the Mac OS X Services. Any application that implements OS X services (that excludes all Carbon applications so far) will have a new option in the "Services" sub-menu, in the application menu.
Note: you may have to log out or force the Finder to quit to see the new option. You obviously have to quit any application that are running when you force quit the Finder. CountChar must be installed in one of the "blessed" application directories, which are /Applications (for computer-wide installation), /Network/Applications (for network-wide use) or /Users//Applications (for specific user installations).
CountChar is now exclusively available from the Mac App Store here.