Stronger by the Day is an Android app developed by Strong Strong Friends, available for free in the Lifestyle category. The app is designed to help users become the strongest lifter they can be, whether at home or in the gym. The app offers a group training program that is dedicated to providing a focused path to strength, with Meg Gallagher, aka Megsquats, as the coach.

The in-gym program involves building muscle and improving strength through progressions on four main lifts: squat, bench, deadlift, and overhead press. The program is complemented by rotating accessory lifts from a library of over 400 movements. Users can also join thousands of other lifters who are on the same journey.

The at-home program is also progression-based, utilizing bodyweight and simple pieces of equipment, such as bands, to build strength. The app also includes features such as an in-app training journal to track progress, suggested weights for each lift based on previous training sessions, and a stats section that visually features squat, bench, deadlift, and overhead press. Additionally, users can access a new week of programming every Sunday, swap out movements with an easy-to-access substitutions library, and access extensive video and blog libraries to improve technique and continue learning.