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We know that not every app is Angry Birds and not every app developer is Rovio. But just how tough are things for the workaday app developer? In a recent GigaOM Pro study (subscription required) of app developers, more than half of the respondents say they make less than $500 a month from their paid apps (see chart below). Perhaps not surprisingly, app development isn’t a full-time job for most of them. Some 75% of 352 respondents either hold another job or do app development only as a portion of their main job. (The picture is even grimmer for developers of advertising-dependent apps — a third of those developers make less than $100 a month in ad revenue, according to the study.)

On the high (and much more rare) end of the spectrum, about 5 percent of app developers in the survey make over $20,000 a month. These developers tend to be part of big app firms.