Independent Developer

Apps that
just work.

Productivity tools and wellness trackers built for everyday use — clean, fast, and available on iOS and Android.

1000+
Active Users
3
Published apps
Free
To download

Apps

iOS Android

PDF Reader & Converter

All-in-one PDF tool

iOS: Nguyen Giap • Android: Pippi

Scan documents with your camera, convert images to PDF, extract text with OCR, merge files, add e-signatures, and read any document — all offline.

  • Document scanner with auto-edge detection
  • Image ↔ PDF conversion (JPEG, PNG)
  • OCR text extraction from scanned images
  • Merge, split, compress, and e-sign
  • Text-to-speech, password-protected files
App Store Google Play
1000+ Users Android

Pippi Period Tracker

Cycle & calendar

Android: Pippi

Track your menstrual cycle, predict upcoming periods and fertile days, and log symptoms — all in a simple, private calendar. Join over 1000 active users!

  • Period & ovulation prediction
  • Cycle calendar with symptom logging
  • Fertility window tracking
  • Health insights and reminders
  • Private — no account required
Google Play Android only
Android

Mood Tracker Daily Journal

Wellness & journaling

Android: Pippi

Log how you feel each day, write daily journal entries, and track your emotional patterns over time to build better mental wellness habits.

  • Daily mood check-in with emoji scale
  • Private journal with free-text entries
  • Mood trend charts and history
  • Daily reminders for check-ins
  • Streak tracking for consistency
Google Play Android only

About the developer

Nguyễn Mạnh Dũng

Independent mobile developer building focused, practical apps for iOS and Android. Each app solves a specific everyday problem — no bloat, no dark patterns, no unnecessary permissions.

Android Apps (Pippi) iOS Apps (Nguyen Giap)
3
Apps published
1000+
Active Users
VN
Based In
Free
All apps