Invoice Manager is a versatile invoice app available on the iPhone App Store. It offers a one-time purchase with no monthly fees and does not require an internet connection. With this app, users can create and send unlimited professional invoices, estimates, and purchase orders. There are 20 different styles and professional templates to choose from, allowing for customization and personalization. The app also provides the ability to sync data across multiple devices, making it convenient for users who work on different platforms.

In addition to its invoicing capabilities, Invoice Manager offers a range of other useful tools. These include time tracking for hourly jobs, expense tracking, inventory management, cost calculation, and currency conversion. The app also supports features such as receipt tracking, customer statements, and the ability to sign invoices and estimates. Users can integrate payment options like Paypal and accept online payments from customers.

Invoice Manager is designed for businesses of all sizes, providing a comprehensive solution for managing various aspects of business activities. The app supports multiple languages and allows users to customize their invoices with their own company logo, font styles, and colors. It also offers data backup and passcode protection for added security.

Please note that for upgrading to the pro version, users can tap on the Menu screen and select "Upgrade to Paid Version." The app currently offers a special Black Friday promotion of $6.99 for the upgrade.

Overall, Invoice Manager is a feature-rich and user-friendly app that provides a convenient and efficient solution for creating and managing invoices, estimates, and other business-related documents.