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According to magazine author Arika Okrent in "Discouraging Words" from Failure Magazine (July 21, 2009), it's Esperanto. She writes,
What is the most widely used invented language?
Definitely Esperanto, which is ironic because when you say “Esperanto,” most people say, “Didn’t that die out in the 1920s?” Or, “Esperanto? That failed utopian ...
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If you don't consider Sanskrit and Hebrew to be conlangs, your best bet would be Esperanto literature, with over fifty books over at Project Gutenberg alone.
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My experiences are largely the same as those of Adarain, though I have access to a data-set that perhaps better shows the predominance of artlangs, as I moderate a moderately sized discord server in which users can request roles that show what kind of languages they make and at the same time get a fancy-coloured name. Many users have more than one roles and ...
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This is a hard to answer question, as there isn’t any statistically useful database. CALS has a bunch of data, but only a small subset of conlangers have ever entered their data there. There, there seems to be a clear preference for the creation of Artlangs, i.e. creating languages simply for the sake of creating art, not to fulfill any purpose. A priori ...
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