I had a problem that my app did not work outside Xcode (had to include the metalkit.framework I found a simple trick to get my NSLog outputs and locate the issue: NSURL *downloadsDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSDownloadsDirectory inDomains:NSUserDomainMask] firstObject]; NSURL *fileURL = [downloadsDirectory URLByAppendingPathComponent:@"Log.txt"]; NSString *filePath = [fileURL path]; // Redirect stderr to the file freopen([filePath fileSystemRepresentation], "a+", stderr); Now you get debug info in your Download folder!