QI - Invoice estimate maker is an iPhone app designed to assist freelancers in keeping track of their work hours and billing. With its user-friendly interface and comprehensive features, this app is a valuable tool for managing invoices and estimates.

One of the key features of QI is the ability to track working time for multiple projects. Freelancers can easily monitor their hours spent on different tasks, allowing for accurate billing and project management. The app also offers the option to export reports in CSV format, making it convenient to share with clients or accountants.

QI also provides enhanced security measures with Touch ID or Face ID integration. Users can protect sensitive information by hiding projects behind biometric authentication, ensuring that only authorized individuals have access.

Customization is another standout feature of QI. Users can create personalized invoices with their own logo and colors, giving their documents a professional and branded look. Additionally, the app supports invoices in 23 different languages, making it suitable for freelancers working globally.

Furthermore, QI offers a monthly billing goal feature, allowing users to set financial targets and monitor their progress. This feature provides freelancers with a clear overview of their earnings and helps them stay on track with their financial goals.

Overall, QI - Invoice estimate maker is a comprehensive and user-friendly app for freelancers who need efficient time tracking and billing capabilities. With its customizable invoices, multiple language support, and enhanced security features, QI is a valuable tool for freelancers in the business and productivity category.