QR Sidekick will run on any modern phone or tablet running iOS or Android. The download links are at the bottom.
The app will only load into a Google Sheet (not Office 365) and requires that you are online. It allows more than one person to scan at a time. Each scan immediately added to the sheet you select. Before the app can write to a sheet you need to give it permission to do so. This is done using the share menu in the top right.
In the dialog that shows add our account email address as an editor
sheets@rightclick-ac379.iam.gserviceaccount.com
Once that email has been added you can copy and paste the URL from the browser into to app.
The app only has the access to the sheet you provide, it doesn't need any other access to your documents or account.