The best replacement for stylecop is fxcop.

The best alternatives to stylecop are rated as following:
★★★★★  fxcop
★★★  resharper
★★  code analysis

Your alternative for stylecop is not listed? Suggest!
Speaking about stylecop, one probably shouldn't forget about resharper.

Other search terms related to stylecop and their ratings are:
★★★★★ resharper
You have in mind a companion for stylecop and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of stylecop in all years. Click on graph for more.
stylecop
fxcop
resharper