BuildByRain buildbyrain.com

Apps I build for fun — and ship.

I’m Mahmudunnobi Rain, a software engineer by trade. BuildByRain is the side of my work I do purely for the fun of it — small apps I design, build, and ship end to end — from Google Play to the Mac App Store.

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Common threads

What they share

Different problems, but the same instincts run through all of them.

Easy on your data plan

Some run entirely on-device; the ones that go online cache what they fetch, so nothing is re-downloaded and a dropped signal isn’t a dead end.

Private by default

No accounts to sign up for, minimal data, nothing sold. What you make stays on your device.

No ads, no upsells

No ads, no coins, no subscriptions — a free download or a flat one-time price, and that’s it.

Work

Projects

Personal projects — all shipped and live, from Google Play to the Mac App Store: reading, business, utilities, games, and a living desktop.

Pathok – জনপ্রিয় বাংলা বই app icon
App Live

Pathok – জনপ্রিয় বাংলা বই

Bengali ebook reader with free books from Bangladesh, India, and translated world literature.

  • Flutter
  • GetX
  • FastAPI
  • SQLite cache
Medic | BD Prescription & Drug app icon
App Live

Medic | BD Prescription & Drug

Mobile prescribing workspace for doctors in Bangladesh — write, manage, and share prescriptions with drug lookup.

  • Flutter
  • GetX
  • SQLite
  • Cached drug lookup
MiniPOS – Shop Khata & Dues app icon
App Live

MiniPOS – Shop Khata & Dues

Easy sales, purchase & due tracker for small shops. Works offline.

  • Flutter
  • Drift / SQLite
  • Google Drive backup
  • Bangla + English
ScanHub – PDF Document Scanner app icon
App Live

ScanHub – PDF Document Scanner

Scan documents to PDF — fast, private, and fully offline. No account, no cloud, no ads.

  • Flutter
  • GetX
  • ML Kit (on-device)
  • On-device OCR
Vividwall – Live Video Wallpapers app icon
App Live

Vividwall – Live Video Wallpapers

Live video wallpapers for your Mac — stunning NASA scenes and sci-fi interfaces built in, or bring your own. Private and battery-smart.

  • Swift
  • SwiftUI
  • AVFoundation
  • Sandboxed
Ludo Pagla app icon
Game Live

Ludo Pagla

Classic Ludo you can play offline — free-for-all, Team Up 2v2, and bots, with the house rules you actually play by.

  • Flutter
  • Pure Dart engine
  • Offline play
  • Bangla + English
The lab

A lab for serious software.

BuildByRain is my workshop for the apps I want to exist — each one a personal project, built with real care and shipped to anyone who wants it. My professional and client work is separate, and isn’t part of this portfolio.