UPSC IAS All in One is a comprehensive learning app for the preparation of IAS, IRS, IFS, IPS. It provides free study material for all the subjects of the syllabus for the 2018 UPSC exams. It also includes questions of previous years' exams, along with the answers and the solutions. 

The app has been designed in a way that will help you in understanding the concepts easily. It also provides you with all the relevant information in a concise manner. The material included in the app has been designed in a way that will help you in getting the knowledge quickly. You can also find the video lectures for all the subjects of the syllabus.