The best replacement for rew is audyssey.

The best alternatives to rew are rated as following:
★★★★★  audyssey
★★★★  omnimic
★★★★  smaart
★★★  xtz
★★★  fuzzmeasure
★★  13b rew

Your alternative for rew is not listed? Suggest!
Speaking about rew, one probably shouldn't forget about audyssey mic.

Other search terms related to rew and their ratings are:
★★★★★ audyssey mic
★★★★ omnimic
★ minidsp
★ spl meter
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rew
audyssey
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