Smart utility apps to protect, optimize, and simplify your digital life. Built with Kotlin, designed for everyday use on Android.
Real-time battery monitoring with calibrated health estimator, smart charge alarm, charging history log, and auto popup on charger connect.
com.johniriantosusanto.batteryhealthcheckapp
Coffee brewing companion with step-by-step recipes for espresso, ristretto, lungo, and more. Supports manual lever machines with custom brew profiles.
com.johniriantosusanto.brewmasterapp
WiFi LAN chat app for local network messaging. Share messages and files across devices without internet — perfect for office or home networks.
com.johniriantosusanto.lanchat
Turn your Android device into a local file server. Browse, share, and transfer files over WiFi with a built-in file browser sorted by date.
com.johniriantosusanto.androidfileserverapp
Manage, read, and write NFC cards and tags with ease. Share NFC data instantly with a clean, user-friendly interface built for everyday use.
com.johniriantosusanto.nfccardmanager
Professional invoicing with PDF export, Bluetooth thermal printer support, client & product management, and cloud sync via Firebase.
com.johniriantosusanto.invoiceapp
Detect hidden cameras and suspicious devices around you using infrared and network scanning. Stay protected in hotels, changing rooms, and public spaces.
com.johniriantosusanto.hiddencameradetector
Save your parking location instantly and navigate back to your car with ease. Works offline with GPS — never forget where you parked again.
com.johniriantosusanto.findmycar