We need a special custom Keypad app for android and ios. You please have to develop the UI and the app itself. Its okay if it is in flutter / dart. The keyboard should be easy to install for the customer and should have three tabs with different functions.
We could use the google standard keayboard for input to have the user select the languages they need. The app should be translated in several languages. Its important that the app is stable. We need one in app purchase.
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We have developed multiple apps in Flutter and that's our core expertise. I would like to share links of live apps with you in chat. Please share UI design to review so we can share proper estimate, let's do it.