As of this month, Chegg's subscription business encompassed Chegg Study, Chegg Writing, Chegg Math Solver, Chegg Study Pack, Busuu, Mathway, and Thinkful. Headcounts capture customers who have paid to connect to the service during a particular time period. The figures disclosed for 2013 were rounded to the nearest 10,000. Following 2013, disclosed subscriber-counts were rounded to the nearest 1,000.