As part of the Cap Protéines national program, Optim'Al has been updated with the new features of the INRA 2018 system and incorporates constraints on protein dependence during its optimization calculation. This new version is available online in an intuitive and easy-to-use web application. The user first enters the characteristics of the target animal, then he lists the feeds he wishes to include in the optimization calculation. The characteristics of the foods are managed in a specific table of the tool allowing to work with predefined foods or with personalized foods. The user can manage MINI and MAXI incorporation constraints according to technical, economic and protein autonomy objectives. Following a calculation, the tool offers the least expensive and/or most autonomous ration to meet the needs of the target animal. Finally, it allows, for foods not retained in fine, to calculate the prices of interest in the context tested.