Billculator
All-in-one invoicing, inventory and ledger app for small businesses
/ Overview
Billculator is an easy invoice maker that brings billing, thermal printing, inventory, expenses and customer ledgers into one app for small business owners. Users can create PDF invoices and estimates, print receipts on Bluetooth thermal printers, track stock that updates automatically with every sale, and keep a daily cashbook — with cloud backup and support for English and Hindi.
View Project/ Project Details
Name: Billculator
Client: Engross Apps
Industries: Business & Finance
Date: 2025
/ Provided Services
Mobile App Design
Clutter-free, calculator-style UI that lets shop owners create bills and estimates in seconds.
App Development
Offline-first Android app with PDF invoicing, Bluetooth thermal printing, inventory and ledger modules.
Cloud Backup & Sync
Secure, encrypted backup and restore so business records stay safe when switching devices.
/ Challenge
Small shop owners were juggling paper bill books, separate calculator apps and handwritten stock registers. Engross Apps needed a single, lightweight app simple enough for non-technical users, yet capable of handling invoicing, thermal printing, inventory and customer credit tracking reliably — even on low-end Android devices.
/ Solution
Digikons delivered a fast, offline-first billing app with one-tap invoice and estimate creation, instant PDF sharing and direct thermal printer support with auto-cut. Inventory updates automatically as invoices are generated, the cashbook and customer ledger fill themselves from transactions, and encrypted cloud backup keeps business data safe across devices.
/ Tech Stack
Chosen deliberately for what this project actually needed, not a default stack applied to everything.
Kotlin
Native Android build optimised for speed and reliability on entry-level devices.
Bluetooth ESC/POS
Direct thermal printer integration with auto-cut and flexible item-name printing.
Firebase
Authentication, encrypted cloud backup and analytics powering sync across devices.
