What are some alternatives?
When comparing ConnectUpz and QR Droid, you can also consider the following products
Barcode Scanner - Barcode Scanner for Android
QuickMark - QuickMark makes everything possible.
MKH Barcode Reader - This tool can be used to scan QR codes on your PC or tablet. Note: a webcam is required.
SecScanQR - The QR-Code Scanner/Generator that cares about your privacy
Obsqr - obsqr is an open-source, fast and lightweight QR scanner for Android.
bcWebCam - Scan barcodes and QR Codes with your computer web cam