The stoic app is divided into three parts:

Read the classic stoic texts from the greatest stoics that have ever lived including Marcus Aurelius, Seneca, and Epictetus.

The books available for free on the app are:
Meditations by Marcus Aurelius
On the Shortness of Life by Seneca
Morals for a Happy Life by Seneca
Enchiridion by Epictetus
The Golden Sayings of Epictetus
As a Man Thinketh by James Allen

The stoics had many practices to help reduce negative emotions like anxiety, the second part of the app helps the user to reframe negative thoughts using multiple stoic techniques.

The final part of the app revolves around the concept of Momento Mori, which means to remind the user of their mortality by letting them know, statistically, how many days they have left to live, as well as how quickly people are passing worldwide on average.
In Stoicism, this later led to Carpe Diem, to seize the day, and live life as richly as possible, while it is still possible.