The Happi app is a free health app for Android users developed by E-sites B.V. It provides knowledge, ease, and trust in dealing with chronic diseases and general health. The app aims to support patients and healthcare providers in treatment by introducing the Happi Health Platform, which consists of three parts.

The Happi Portal allows healthcare providers to remotely view the results on the Happi app. Patients create a Happi account, select their care providers and grant access to their data. The Happi App gives patients information about their disease-specific health goals, allows ordering repeat medication (for patients living in the Netherlands), and is supported by various patient associations. Lastly, the DataLab feature allows patients to give permission to anonymously share their data with the Happi DataLab to conduct research and improve the quality of care.

The app is disease-specific for patients infected with the HIV virus, those with chronic skin diseases, and blood disorders. The Happi Health Platform's objective is to offer accessible, easy, and people-friendly care to make patients Happi-er and Healthy-er.