I'm working on a workout API and native apps (iOS/Android) for Strength Level [1] as another interface for my.strengthlevel.com [2]. Strength Level helps you understand your relative strength - how strong you are for your bodyweight.
Using PHP Slim Framework, MySQL, and vanilla Swift/Java. Prioritizing reliability and efficient sync between local storage and server. Currently finalizing API endpoints and feature matching the web app. Next up is adding a subscription model.
It's challenging as:
- Users want to use the app offline which means we need to sync
- We have to match our existing features on [2] in the first version and evolve the API and database to support reliable sync
- Users want to also track their cardio too e.g. Running Level [3] and Rowing Level [4] but that will have to come out in a future version