Hey DEV community!
I'm Abhishek, a solo Android developer from Bihar, India. After months of late-night coding, I launched my app Lihenium: Scan PDF & Vault on Google Play Store!
🤔 Why I Built It
I was frustrated using 5 different apps just to scan, edit, manage, compress and lock my documents. So I built one app that does everything — offline-first, private by default.
🛠️ Tech Stack
- Kotlin + Jetpack Compose
- OpenCV for smart document corner detection
- Room Database for local storage
- CameraX for scanning
- ML Kit for OCR
📱 Core Features
- ✂️ PDF Tools: Merge, split, sign, OCR & watermark
- 📷 QR Scanner & Generator
- 📄 Smart Document Scanner with auto-crop
- 🔒 Secure Vault with biometric lock
- 📁 Doc Library with folders & tags
- 🖼️ Passport photo maker & background remover
- ☁️ Optional Google Drive backup
💪 Biggest Challenges as Solo Dev
- Integrating OpenCV efficiently without bloating the APK
- Handling 10,000+ images without OOM crashes
- Keeping the final APK at just 18MB with all features packed in
🚀 Try It!
👉 Play Store: https://play.google.com/store/apps/details?id=com.abhi.docu
Would love your honest feedback! 🙏
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