Over time I built a small set of Android apps, mostly single-purpose utilities and one developer-focused companion tool.

Utility apps (no accounts, no subscriptions): - Offline PDF & EPUB reader/editor - QR & barcode scanner and generator - Phone hardware and battery diagnostics

Developer tool: - VSCoder Copilot – a mobile companion for VS Code / GitHub Copilot workflows

For the utility apps, the focus was: - minimal permissions - no background services - all on-device processing

VSCoder is different by nature and supports optional paid features.

I’d appreciate feedback, especially on UX decisions, permission discipline, and whether there’s still room for focused utility software on Android.

Google Play links:

PDF & EPUB Reader–Editor https://play.google.com/store/apps/details?id=com.pdfepub.readereditor

QR & Barcode Scanner https://play.google.com/store/apps/details?id=com.emirbaycan.qrbarcode.scanner

Phone Health Checker https://play.google.com/store/apps/details?id=com.phonehealthcheckernew

VSCoder Copilot https://play.google.com/store/apps/details?id=com.emirbaycan.vscodercopilot