I have been using Foreceipt since 2012. I enjoy the app, but not that it only backs up to Google Drive. I hit the limits twice now in the last two months where I had to delete some things from Google Drive to back up my information. To continue to use this app, I will need to delete data on the app or subscribe to storage through Google since they don’t have backups through any other service. I already purchase iTunes backup and Dropbox, I don’t want or need anymore backup services.
Never used Foreceipt but the two that come to mind (aside from dedicated scanning apps like Scanbot or Scanner Pro) are Shoeboxed and Evernote Scannable: