OneB Invoice is highly praised by users for its efficiency and user-friendly interface, making it ideal for freelancers and small businesses. Users appreciate its ability to replace multiple tools, offering seamless document creation, signing, and data storage. The service supports multiple languages and includes features like online payments and automatic reminders, which are particularly valued by freelancers. Overall, OneB Invoice is recommended for its simplicity and effectiveness in automating financial tasks, with users noting its intuitive design and time-saving capabilities.