The best replacement for release build is debug build.

The best alternatives to release build are rated as following:
★★★★★  debug build
★★★  debug build asp net
★★  debug visual studio
  debug

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Speaking about release build, one probably shouldn't forget about pdb.

Other search terms related to release build and their ratings are:
★★★★★ pdb
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release build
debug build
debug build asp net