What are some alternatives?
When comparing ConnectUpz and MKH Barcode Reader, you can also consider the following products
Barcode Scanner - Barcode Scanner for Android
QuickMark - QuickMark makes everything possible.
SecScanQR - The QR-Code Scanner/Generator that cares about your privacy
Obsqr - obsqr is an open-source, fast and lightweight QR scanner for Android.
QR Droid - QR Droid Zapper
bcWebCam - Scan barcodes and QR Codes with your computer web cam