Odoo is renowned for its modern interface 1. Odoo is renowned for its modern interface: Odoo is renowned for its modern, intuitive, and user-friendly interface. The user experience is generally appreciated, with smooth navigation and relatively quick learning curve. 2. Ciel and Sage: Although the interfaces of Ciel and certain versions of Sage have evolved, they can sometimes seem more traditional or less intuitive to some users, especially non-accountants. 3. When to choose Ciel or Sage? Ciel can be a good choice for very small businesses or freelancers who have very specific needs and do not want a comprehensive solution, focusing, for example, on accounting or business management alone. Sage remains a robust and reliable solution, particularly for SMEs and large companies with very advanced accounting and financial needs, who are already familiar with the Sage ecosystem, or who have specific industry requirements for which Sage offers dedicated solutions.