Invoice Maker & Quotation Generator

Invoice Maker & Quotation Generator is a fast, offline-first Android mobile application built for freelancers, contractors, small business owners, consultants, and service providers. Create itemized estimates, track payments, calculate taxes automatically, and generate sleek A4 PDF invoices directly from your phone—with zero subscriptions, zero account logins, and 100% on-device privacy.

Key Value Propositions & Features

• ⚡ 100% Offline & Instant: Works everywhere without requiring an active internet connection. All customer records, item catalogs, and financial balances remain privately on your device.
• 📄 Professional ISO A4 PDF Engine: Generates high-resolution vector PDF invoices and estimates complete with your custom business logo, payment terms, bank details, and signature.
• 🔄 1-Tap Quotation to Invoice: Turn accepted price quotes into formal invoices instantly without retyping line items or client details.
• 💼 Built-in Client & Item Catalog: Store repeat clients, addresses, hourly rates, and standard inventory units (pcs, hrs, kg, days, units) for rapid billing.
• 📊 Payment Tracking & Status Badges: Record cash, bank, or card payments with real-time tracking of Subtotal, Discounts, Taxes, Total Paid, and Balance Due.
• 🌍 Multi-Currency & Dark Theme: Global currency support (USD, EUR, GBP, AED, INR, CAD, AUD, JPY, SAR, etc.) with dynamic Material 3 Dark & Light themes.

Technical Architecture & Tech Stack

Specification	Details
Platform	Android (Min SDK 24 / Android 7.0+ up to Android 15)
Language	Kotlin 2.0+ (100% Modern Kotlin)
UI Framework	Jetpack Compose + Material 3 Design System
Architecture	MVVM (Model-View-ViewModel) + Kotlin StateFlow & Coroutines
Local Database	Android Room Database + SQLite (Local On-Device Persistence)
PDF Engine	Android Native Vector PDF Engine (android.graphics.pdf.PdfDocument)
Document Sharing	Android FileProvider with sandboxed, temporary read-only permissions
Security & Privacy	Zero Cloud Telemetry, Zero Analytics, 100% Offline Sandboxed Storage
Package Name	com.sohaibworld.invoicemaker

Visual Showcase & Screenshots

Frequently Asked Questions

Q: Does the app require an internet connection?
A: No. Invoice Maker & Quotation Generator is 100% offline. All client details, item lists, and documents are stored locally on your device.

Q: Can I add my own business logo to the invoices?
A: Yes! In the Business Profile settings, you can choose any logo or image from your phone gallery. It will appear at the top of all generated invoices and estimates.

Q: Are my client and financial details private?
A: Absolutely. We do not operate cloud servers, track usage, or collect your data. Everything stays in your device’s secure local database.

Q: How does Quotation conversion work?
A: When a quotation is accepted by your client, simply tap “Convert to Invoice”. The app clones all line items, customer details, and price modifiers into a new invoice immediately.