Find thesis builders at TomMarch.com and JohnMcGarvey.com, as of 2015. The builders make use of user input to write thesis statements. Both thesis builders are free to use, although Tom March accepts donations as well.
While both thesis builders consist of five steps, they build thesis statements in different ways. The builder by Tom March asks for the user's opinion, supporting arguments and an opposing point of view. McGarvey's builder requires the user's opinion, qualifications and the reason why the user's argument should be considered. The first builder is better suited for essays that compare two ideas, whereas the latter is better suited for essays that make strong statements.