I'm currently building a workout tracker and a nutrition/macro tracker with my co-founder.
Workout app:
https://justfitness.io/
Manage, track, and analyze your workouts across your devices.
Macro tracking app:
https://www.getmicro.app/
Confidently control your nutrition to reach your diet goals.
Track your macros, weight, cardio, consistency, and adherence.
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The workout app is available to download now for the web, mobile, and Android. We're working on an iOS release right now :) But will soon get a reskin to match our overall company branding (Micro).
What are you building? :D