Sandyl is a free lifestyle app available for iPhone users. With Sandyl, you can easily track your habits and how they affect your health. Whether you're taking supplements or trying out new health routines, Sandyl helps you determine their effectiveness.

One of the standout features of Sandyl is its ability to build both simple and complex A/B tests with control variables. This allows you to compare different habits or routines and see which ones have a positive impact on your health. By conducting these tests, you can make informed decisions about what works best for you.

Sandyl also offers customizable Health Stats tracking. You can choose the specific health metrics you want to monitor, whether it's steps taken, sleep quality, or water intake. This personalized approach helps you focus on the areas that matter most to you.

Logging your data in Sandyl is a breeze. You can easily record your daily habits and view the results in an organized manner. This allows you to visualize your progress over time and make adjustments as needed.

Overall, Sandyl is a valuable tool for anyone looking to improve their health and track the effectiveness of their habits. With its intuitive interface and customizable features, it's a must-have app for those dedicated to their well-being.

Please note that Sandyl is compatible with Apple Watch Series 8 or higher.