If you want to subtract, use a negative number. Create a note where numbers are detected and added automatically. Craete a folder to organize multiple notes and folders. A folder to shows a grand total for everything inside. A numeric keypad and date buttons for easy entry. Choose font type, size, colors for the numbers. iCloud Sync for multiple iOS devices Importing & Exporting CSV file Lock Screen using TouchID or FaceID Advanced Search can do AND (All Keywords) or OR (Any Keyword) searches. Save as PDF