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Certain bar codes are never designed (like pdf417) to be scanned using a camera. Thus a special device required to capture certain 1D and 2D barcodes. While there are more and more scanners on the market, there is one model that stands out - KDC300i. It works with all iOS devices (via bluetooth) and scans pretty much ANY type of barcode that comes your way.
How about Genius Scan? It's free, but seems just like other paid scan app. Wrong? Since I haven't used paid scan app, Please let me know if there is/are big difference(s) in function/usage. Thanks
The problem with scanning certain barcodes (like pdf417) is that they have been designed (in the 90s) to be scanned using a laser, not a camera. So regardless what app you have, it just will not scan such barcode because of the hardware (camera) limitation.
I use Genius Scan regularly. Just scan and email. No need for a traditional scanner. You can also use a stand for holding such as the one at ipaddocumentcamera.com
But, I have and do use a few iPhone apps when they are the only option available and/or the price of the iPad equivalent is too much for something that I rarely use. Doesn't happen often though.