Javed Khan Labs Software Portfolio

Practical, Offline-First Applications

Name: pennyBook Ledger
Author: Javed Khan

Every product is engineered with genuine utility, local-first data architecture, and zero intrusive tracking.

Flagship Productv1.0.1 Closed Testing

pennyBook Ledger

"Your money. Your records. Your privacy. Financial software shouldn't require surrendering your personal data to cloud servers or ad networks."

pennyBook Ledger is an offline-first personal financial manager engineered with Jetpack Compose, Material 3, and Room SQLite database. Tailored for both Indian and global financial conventions (UPI, Cash, Cards, Net Banking, Cheque), it operates with strict local-first data sovereignty — zero mandatory account sign-up, zero analytics trackers, and zero transmission of private accounting records to remote servers.

100% Offline with zero cloud sync

Udhaar debt & credit ledger

Interactive spending charts

AES-256 encrypted backups

Detailed App Overview Google Play Official PennyBook Site

Native Utilities & Ongoing Experiments

Independent applications currently in active development or conceptual design.

Android ApplicationActive Development

Qibla Direction Compass

Accurate, privacy-first Qibla compass for Android.

A native Android compass application that computes the exact great-circle bearing to the Kaaba with true-north declination correction.

•Sensor-Based Direction Finding: Uses Android's rotation-vector hardware sensors to provide responsive, smoothed real-time needle movement.

•Magnetic Declination Adjustment: Automatically adjusts magnetic heading to true geographic north using Android's built-in geomagnetic declination algorithm.

•Alignment Feedback: Clear visual cues with 'Qibla facing' confirmation and subtle haptic vibration when your device faces Mecca.

Android NativeKotlin 2.0Rotation-Vector SensorsGeomagnetic Field CalculatorAndroid Location ServicesTarget SDK 36Material Design 3

Details & Specs

Utility ToolIn Ideation / R&D

Future Studio Experiments

Practical software utilities and productivity tools in R&D.

Upcoming experimental tools exploring local-first utilities, device management helpers, and privacy-centric data workflows.

•Lightweight Personal Utilities: Minimalist tools designed to solve single, well-defined problems without subscription paywalls or tracking.

•Local-First Data Connectors: Bridges for moving and backing up personal records without central vendor lock-in.

•Developer & AI Automation: Streamlined agentic scripts and templates for high-speed software testing and cloud infrastructure validation.

KotlinJetpack ComposeTypeScriptNext.jsPython