And for a more practical comparison: https://valgrind.org/gallery/survey_03/q4.html https://valgrind.org/gallery/survey_03/q4.html The takeout is: valgrind is

And for a more practical comparison: https://valgrind.org/gallery/survey_03/q4.html https://valgrind.org/gallery/survey_03/q4.html The takeout is: valgrind is free and doesn't require recompilation, purify has a more complete UI, they both have similar performance impact and bug-finding abilities.