The numbers below are for a project with one cube, one camera, and one scene. None of the standard or other assets were included. The upshot is that around 14MB of "something" extra (i.e., debug symbols) is being compiled in. Since there are only three objects in the entire project, this seems a little excessive. I bring this up because I have noticed that builds can get ununusually large. I wasn't sure if this was an artifact of running Unity on an Intel Mac, or if this was normal behavior. I do understand that around 10MB (spread between the frameworks and the binary) is the minimum to provide core functionality. Universal Binary Code (csharp): Zelda:~/Desktop/test_unity_project/build_with_cube.app/Contents flip$ du -sk * | sort -n 4 Info.plist 4 PkgInfo 24 Data 1348 Resources 8668 Frameworks 29036 MacOS Zelda:~/Desktop/test_unity_project/build_with_cube.app/Contents flip$ ls -l MacOS/ total 58072 -rwxr-xr-x 1 flip flip 29731960 Apr 8 11:09 test_unity_project Intel Only Code (csharp): Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only.app/Contents flip$ du -sk * | sort -n 4 Info.plist 4 PkgInfo 24 Data 1348 Resources 5252 Frameworks 19948 MacOS Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only.app/Contents flip$ ls -l MacOS/ total 39896 -rwxr-xr-x 1 flip flip 20425120 Apr 8 11:17 test_unity_project Intel Only, strip debug Code (csharp): Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only_stripped.app/Contents flip$ du -sk * | sort -n 4 Info.plist 4 PkgInfo 24 Data 1348 Resources 5252 Frameworks 5712 MacOS Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only_stripped.app/Contents flip$ ls -l MacOS/ total 11424 -rwxr-xr-x 1 flip flip 5846888 Apr 8 11:21 test_unity_project Intel Only, compress textures and strip debug Code (csharp): Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only_compress_and_strip.app/Contents flip$ du -sk * | sort -n 4 Info.plist 4 PkgInfo 24 Data 1348 Resources 5252 Frameworks 5712 MacOS Zelda:~/Desktop/test_unity_project/build_with_cube_intel_only_compress_and_strip.app/Contents flip$ ls -l MacOS/ total 11424 -rwxr-xr-x 1 flip flip 5846888 Apr 8 11:20 test_unity_project
Debug symbols are from the frameworks and executable - they're a constant overhead, and not related to your project size.