If you want to study and update yourself in Work Safety without leaving home and for free, Mr. SMS is the right app for you. It is the most complete and free app that assists you in your work, study and career. This Android app offers a range of features that are simple and clear to use. You can access monthly specialist talks with the most voted topic of the week, quizzes of the most competitive contests for you to study, DDS Diary for you to apply in the company that you work for, and free and paid courses. The app also provides updated regulatory norms (NRs) offline with an alert message service to keep you updated whenever there are changes. You can also access updated checklists of the main NRs, which allow you to audit the application itself and share the checklist via e-mail or WhatsApp. The app also offers dictionaries and technical terms, CA query, market news, and hundreds of security tips, among others. You can even access job vacancies, free books from Fundacentro, and the SST Observatory. The eSocial Calculator and TST eSocial system online are also included in the app.