United States

The United States has the largest pool of professional beta readers, many of whom specialize in a specific genre such as romance, fantasy, or thriller. Because the market is so large, authors can often find beta readers with deep familiarity in a narrow subgenre, which tends to produce more useful, targeted feedback than a generalist read.

Ask a prospective beta reader what genres they read for pleasure, not just professionally, since genuine familiarity with a genre's conventions tends to produce sharper, more useful feedback.