Ledger Books is a free Android app that provides a unique set of features to help you manage your personal or business financial records and calculations. It allows you to create an unlimited number of ledger books, and no data is collected or shared. The app provides multiple backup and restore methods, including automatic backup and restore via Google Drive.

The app's spreadsheet-style records organization makes it easy to enter and track transactions. You can also use the app's built-in expression calculator to perform calculations. Transaction details can be automatically sent through Gmail, SMS, and WhatsApp, and the app provides automatic bulk Gmail and notifications when the due date is approaching. You can also send Gmail, SMS, and WhatsApp on behalf of you.

Ledger Books also offers advanced data loss prevention algorithms and financial reports. You can view your books as CSV in spreadsheets and share books through social media. The app provides app-level and book-level Auto Completions and full-text search to easily locate transactions.

Overall, Ledger Books is a comprehensive and user-friendly app that is suitable for anyone who deals with financial activities.