Android Khatabook-Style Reminder App

@s9iper1

Hello, I can build your Android payment-reminder and ledger app using Flutter, including customer balances, transaction history, scheduled SMS/WhatsApp/push reminders, payment gateway integration, and CSV/PDF exports. I’ll deliver a stable, tested app with clean source code and documentation. After reviewing the complete requirements, we can finalize the timeline and budget based on the exact scope.

@hassans5

Hi, I understand you need an Android-only Khata book style balance management app focused on automated payment reminders. I can build the customer ledger, balance tracking, scheduled SMS , Whats App and push reminders, payment gateway, transaction history, CSV or PDF exports, and real-time payment updates. I’ll keep the app stable on Android 10+, with a clean Kotlin/Flutter architecture and proper testing for the complete payment and reminder flow. Quick question: Which payment gateway do you want to use, and should Whats App reminders be sent through the Whats App Business API? Best Regards, Hassan H

@shayankhan333

Hi, I can build your Android-only Khatabook-style reminder app in Kotlin, with customer ledgers, scheduled SMS, WhatsApp, and push reminders, plus a payment gateway so customers clear dues from the reminder link. For the scheduler, I will log every reminder with a timestamp and auto-adjust balances the moment a gateway webhook confirms payment. Questions: 1) Which payment gateway do you prefer, Razorpay, Stripe, or another? 2) Should WhatsApp reminders go through the official Business API or a click-to-chat link? Looking forward to discussing further. Regards, Shayan.

@rakhshanz3

As a seasoned AI and Machine Learning specialist with a strong background in mobile application development, I believe I would be an ideal fit for your Android Khatabook-style Reminder App project. I understand that your main priority is to have a functional, user-friendly app that can automate reminders and initiate payments when necessary. My expertise in AI and mobile app development will be invaluable in constructing an efficient system that meets all the features outlined in your project description. Over the course of my career, I've acquired extensive experience creating similar applications in a range of languages including Kotlin and Flutter. My previous work includes implementing secure payment gateway integration for seamless transactions, comprehensive user profiles with transaction history and export options, as well as robust push notification systems. Moreover, ensuring stability and performance is ingrained in my coding practices. I'm confident in producing clean code that can handle large data sets and processing needs without crashes or slowdowns. With your acceptance criteria in mind, I am meticulous about testing and debugging; guaranteeing your app will run smoothly on Android 10+ without any hitches regardless of the size of your customer base or number of transactions.

@savaliyaravina13

Hello, I read your requirement for an Android app similar to Khatabook, focused on customer balances, automated payment reminders, transaction history, and online payments. I have 6 years of Flutter experience and have worked on similar finance and business management apps involving customer ledgers, wallet/transaction management, payment gateways, notifications, and PDF/CSV reports. I can build the balance and reminder system with daily, weekly, or custom schedules, maintain complete payment/reminder history, and ensure the ledger updates correctly after successful, failed, or cancelled payments. Flutter would be my preference for this project, while keeping the architecture clean enough to support iOS later if required. I can share the similar app I worked on from my portfolio for your review. Best Regards, Ravina

@YousefAiman

Hi, I’m Yousef, an Android developer working with Kotlin, Jetpack Compose, Room, Firebase, notifications, and REST APIs. Your app can be designed as a lightweight ledger first, with reminders built cleanly around the customer balance data. I’d implement: • Customer profiles and pending balances • Credit/payment transaction history • Automatic balance calculation • SMS, WhatsApp, and push reminder options • Scheduled reminder notifications • Room-based local storage • Search and customer filtering • Clean Material-style interface • Optional cloud backup/sync I’d keep the ledger as the source of truth rather than storing only a current balance, so every payment or credit entry remains traceable and balances can always be recalculated correctly. For WhatsApp reminders, I’d also confirm whether you want user-triggered WhatsApp sharing or integration with the official WhatsApp Business API. Best, Yousef

@fazeelrb

Hi, With 7+ years of Android and Flutter development experience, I can build this as a focused ledger and payment-reminder app rather than overcomplicating it. I’d structure the customer ledger so balances and payments update reliably, with a clear transaction history and CSV/PDF export. The reminder system can handle scheduled SMS, WhatsApp, and push notifications while recording each notification with its timestamp. I can also integrate the payment gateway so successful, failed, and cancelled transactions are reflected correctly in the ledger. I’ll pay particular attention to reliability around repeated transactions, payment callbacks, and background scheduling, and deliver the project through Git with clean build/setup documentation. I’m available to start immediately and can discuss the preferred payment gateway and reminder provider before development.

@tyronet2

Hi, I can build this Android app as a simple, reliable Khatabook-style ledger focused specifically on collecting pending payments. I’ll handle the customer ledger, payment tracking, scheduled SMS/WhatsApp/push reminders, payment gateway integration, transaction history, CSV/PDF export, and real-time balance updates. I’d recommend Kotlin + Android native for a lightweight Android-first app with reliable notifications and payment handling. I’ll also test the complete flow—including successful, failed and cancelled payments—and deliver the source code, build files and setup documentation via Git. The key is keeping the app fast and extremely simple for a small retail business. I’m ready to start and can discuss the payment gateway and reminder workflow before development.

@lokeshn30

Hi, I can build your Android Khatabook-style reminder app with Flutter/Kotlin, including customer ledger, balance tracking, scheduled SMS/WhatsApp/push reminders, payment gateway integration, transaction history, and CSV/PDF export. I’ll ensure the payment status syncs correctly with the ledger and every reminder/payment is logged with timestamps. I’ll also provide the complete source code, Git setup and build documentation. I have strong Flutter and API/payment integration experience and can deliver a clean, reliable Android app with proper testing. Let’s discuss the existing workflow and start quickly.

@patodeh

Developing an Android application to manage customer balances and send reminders is the core requirement. I will build a Kotlin or Flutter-based app that allows creating and editing customer entries, updating balances, and sending reminders via SMS, WhatsApp, or push notifications on a scheduled basis. I will set up secure payment gateway integration for customers to settle dues directly from the reminder link. I will deliver a fully functional app with a customer transaction history and exportable CSV or PDF features. To confirm, will the payment gateway be provided or should I integrate a specific one. I will provide a complete solution meeting the acceptance criteria. Let's discuss to lock in the exact scope and get started.

@UmairBuildsAI

Hey, I can help build your Android Khatabook-style reminder app with customer ledgers, automated payment reminders, transaction tracking, payment integration and reporting. You can review my work here: https://www.freelancer.pk/u/UmairBuildsAI I have experience with full-stack development, APIs, authentication, databases, payment integrations and automation workflows. I can structure the app so you can add customers, manage balances and payments, maintain complete transaction history, schedule daily/weekly/custom reminders, and automatically update the ledger after successful payments. I can also implement secure backend APIs, push notifications, CSV/PDF exports and maintain timestamped reminder/payment logs, with the project delivered through Git for easy maintenance. Could you please confirm which payment gateway you want to use, and whether SMS/WhatsApp reminders should be sent through your existing provider or need a new API integration? Happy to jump on a quick call to review the project flow and get your project live smoothly. Best Regards, Umair

@Hassana914

Hello, I have 5+ years of Flutter development experience and can build your Android ledger and payment reminder app with a clean, reliable, and easy-to-use interface. I can implement customer management, running ledgers, automated SMS/WhatsApp/push reminders, payment gateway integration, transaction history, CSV/PDF exports, and real-time payment updates. I’ll ensure the app is stable on Android 10+, properly tested, and delivered with clean source code, build files, Git setup, and deployment documentation. Let’s discuss your requirements and get started.

@MohdAteek

I’m a React Native & Mobile App Developer with 5+ years of professional experience building, improving, and maintaining high-quality mobile applications for Android and iOS. Thanks!

@CliveMSoftware

I've built several Khatabook-style ledger apps for small retail businesses, so this project fits my wheelhouse perfectly. I'll develop a clean, crash-free Android app in Kotlin with a local SQLite database for offline reliability, plus Firebase Cloud Messaging for push notifications. The payment gateway integration will use Razorpay or PayU sandbox (your choice) to let customers settle dues directly, with instant ledger updates. I'll build the reminder scheduler to support daily, weekly, and custom dates with full logging, add CSV/PDF export for transaction history, and stress-test the entire flow with 100+ consecutive transactions before delivery. You'll get a working APK, Git repository with clear setup notes, and a demo video showing the full workflow.

@anas389

Hi, I can build this Android app with a simple Khatabook style workflow focused specifically on tracking outstanding balances and making customer reminders easy to manage. I’d structure the app so customer profiles show the current balance and complete transaction history, while payments automatically update the running ledger. The reminder scheduler can support daily, weekly, and custom dates, with every SMS, WhatsApp, or push reminder recorded with its timestamp and status. For payments, I can integrate the gateway in sandbox mode first and ensure successful, failed, and cancelled transactions are correctly reflected in the ledger. I’ll also include CSV/PDF exports, payment confirmations, and proper validation for reliable Android 10+ operation. 1. I’ll keep the codebase clean and maintainable in Flutter or Kotlin, with the build files and setup documentation delivered through Git. 2. I’ll test the core customer, reminder, and payment flows thoroughly, including repeated transaction testing before handover. Question 1: Do you already have a preferred payment gateway, such as Razorpay, or should I recommend one based on your target customers? Question 2: Should WhatsApp reminders use the official WhatsApp Business API, or do you already have a WhatsApp provider configured?

@praveen031924

I have a strong background in Java, Python, web development, API integration, database management, and user interface development. I can build a clean and reliable Android application with a well-structured architecture and proper API/backend integration. I am comfortable working with payment gateway integration, databases, and debugging application issues. I will provide clean source code, build files, and clear setup instructions through Git, with regular progress updates throughout the project. I am ready to review the complete requirements and begin with the first milestone.

@Teshome6

I understand you are looking to build an Android ledger application (Kotlin or Flutter) focused on tracking outstanding customer balances, sending automated multi-channel payment reminders (SMS, WhatsApp, Push Notifications), and processing direct settlements via payment gateway integration. What usually matters most in ledger and reminder systems is ensuring reliable background scheduling (such as Android WorkManager or Firebase Cloud Messaging) so reminders trigger on time, while strictly maintaining transactional consistency between the payment gateway webhook and the ledger database. My approach involves building a responsive client app using Flutter or Kotlin paired with a lightweight backend (Node.js/Laravel) to handle scheduled messaging logs, secure payment gateway signature verification, and exportable CSV/PDF ledger reporting. I am fully available for Git-based delivery and milestone-driven collaboration. A few quick questions: Q1: Do you prefer a cross-platform Flutter build or native Android with Kotlin? Q2: Which primary payment gateway (e.g., Razorpay, Cashfree, or Paytm) do you plan to use for the link-based settlements? Q3: For automated SMS and WhatsApp reminders, do you have an existing SMS gateway / WhatsApp Business API provider (like Twilio, Fast2SMS, or WATI), or should I recommend one? Looking forward to hearing from you.

@marslanrauf

⭐ Respected Sir ⭐ I have reviewed your project and understand that you need an Android app focused on customer balances, automated reminders, and easy payment collection. ✅ Android app with Kotlin/Flutter ✅ Customer ledger & transaction history ✅ SMS, WhatsApp & push reminders ✅ Secure payment gateway integration ✅ CSV/PDF exports & payment tracking I can build a reliable and user-friendly solution with accurate ledger updates, scheduled reminders, secure payments, and complete transaction logging, while ensuring the app is stable and well-tested. I am ready to start right away and can begin work immediately. Warm Regards, Muhammad Arslan Rauf

@jefryNovrialdy

Thanks for detail. I have worked on various android apps from start to deploy. So I know this workflow well. I can make you get good result quickly. Thanks Jefry