GKI Tracker is a lifestyle app designed for iPhone users, developed by Matthias Mellouli. This free app focuses on health and fitness, allowing users to monitor their Glucose Ketone Index (GKI). Users can input their Glucose and Ketones to calculate their GKI on the dashboard. Additionally, the app offers the functionality to sync Glucose Level data with the Health App seamlessly.

In the app, users can access their history to track progress over time and observe improvements. Moreover, GKI Tracker provides resources for users following a Keto diet, enabling them to discover Keto-friendly foods and efficiently manage their Keto grocery list.