For now our app is only for iOS and Android, but soon we will have a version for desktop. So you can use any NFC reader/writer to connect on your desktop.
n0nce has a point, people don't want to be online at all when they are dealing with their seed words.
Device with CryptoPlatz app needs to be online to download and install it, so desktop app is must have option for everyone.
Airplane mode but most people could make a mistake and just used app online.
Can you tell me what android version is oldest supported by your app?
Older phones might not be able to install app so that could be one more issue I faced before with other Android apps.