Indexel Data Science is the young Berlin-based data subsidiary company of Indexel, an editorial and digital agency located in Paris, created nearly 20 years ago, and which generates a turnover of around € 2 million (www.indexel.com). Indexel Data Science supports medium and large size companies, mainly in Germany and Europe, to help them increase their web audience, analyze it and optimize performances both quantitatively (performance increase) and regarding data quality (reliability of figures).