The KIDA database is a collection of kinetic data for astrochemistry that has now been used by a large community. Last year, we have entirely changed the online interface and extended it to surface reactions. There are still more questions that arise time to time about the way to use the database. In parallel, our group in Bordeaux have been developing an astrochemical model called Nautilus that can compute gas and grain composition in the interstellar medium under many different conditions. This code is available upon request and starts to be used by several groups. In this presentation, I will present user cases of the use of the KIDA database and the Nautilus astrochemical model to help potential users.