In our experience (examprofessor.com) setting more severe limits to our free plan boosted paid sales 2x, which was very welcome. We started with a free plan, on

In our experience (examprofessor.com) setting more severe limits to our free plan boosted paid sales 2x, which was very welcome. We started with a free plan, one exam, unlimited students. Later, we limited the free plan to one exam w/ 10 students and many of our clients jumped up to a paid plan. I think if you do have a free plan, seriously limit features in a manner that encourages clients to upgrade.