Dynamic Yield is a personalisation and experimentation platform that organisations use to tailor websites, apps and emails to visitors and to test variations. It provides recommendations, A/B testing and audience segmentation, among other features. The platform is delivered as a cloud service and connected to a customer's website or app through scripts and APIs. Dynamic Yield is part of Mastercard, which acquired it from McDonald's.
Mastercard Inc. is headquartered in Purchase, New York, in the United States, so the service falls under US jurisdiction, including the CLOUD Act. Dynamic Yield describes itself as a data processor that is fully GDPR-compliant, with ISO 27701 certification; the customer remains the data controller. Visitors receive a random ID, email addresses are hashed, and according to the vendor IP addresses are not stored. No hosting location or data processing agreement is published, so ask for these in advance.