Unless someone from Intuit wants to chime in and give us current figures, there are different ways to estimate the number of businesses using QuickBooks:
In mid-2008, Intuit claimed that QuickBooks had 3.7 million users, representing 94.2% of the business accounting market.
A current Intuit webpage asserts that QuickBooks holds 85% retail market share in small business accounting software.
SCORE says there were an estimated 29.6 million small businesses in America in 2009. How many of them license their own accounting software? Who knows? The vast majority of the ones who do their books in-house, however, have got to be using QuickBooks.
It’s a huge market, and there are thousands of software developers in the Intuit Developer Network who want to reach that install base. These developers can try to get their app listed in the Intuit App Center.
Those select apps have a built-in marketing connection to the user base, at least for users of the 2010 and 2011 versions of QuickBooks. The App Center — located as a button on the QuickBooks icon bar — makes those apps just one click away from the user. Selected add-on developers can also advertise on QuickbooksUsers.com.
How about users in the cloud? Intuit now claims 215,000 users of its QuickBooks Online Edition, with growth last year of 44%.
Any way you look at it, QuickBooks dominates the SMB accounting software market.