Offline Android Inventory Management App

I need a simple, fully-offline Android application that helps me control stock inside my godown. The app should let an Admin user (no other roles are required) perform three key jobs: • Stock tracking – add new items, record inward and outward movement, and view current quantities at a glance... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, App Design, Kotlin, Mobile App Development, Mobile Development, PHP, Software Architecture)