Algorithm Playground is about investigating what makes algorithms more trustworthy. It aims at bringing a human perspective on decisions made by recommender systems. This is a tool developed by the Edinburgh Team involved in the ReEnTrust Project. Algorithm Playground gives users the chance to discover how the algorithms influence their choices when looking for a hotel to book. In this tool, the users can perform several tasks:

• Users can compute lists of recommended hotels for several persona with different genders and traits.
• Users can play with the inputs and watch the changes in the outcome.
• Users have the possibility to switch between several recommendation algorithms to see how this choice is crucial for any recommender system.