Only the current version so far — new entries appear as the app ships updates.
QR Code Reader - Fast Scanner is a tools app by woodsmall inc. with 10,000+ downloads (about 31K estimated). +11 installs in the last 7 days. Released Sep 15, 2015. Install growth, rank history, SDKs and ad networks.
From the store listing: “Simple, fast, and free QR code reader & barcode scanner app.”