The best replacement for c++11 is c++98.

The best alternatives to c++11 are rated as following:
★★★★★  c++98
★★★★  c++0x
★★★★  boost
★★★  gnu++11
★★★  c++14
★★  c++03
★★  c11

Your alternative for c++11 is not listed? Suggest!
Speaking about c++11, one probably shouldn't forget about g++.

Other search terms related to c++11 and their ratings are:
★★★★★ g++
You have in mind a companion for c++11 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of c++11 in all years. Click on graph for more.
c++11
c++98
c++0x