Dev Ships Five 'Simple' Apps That Turn ChatGPT Into Your Workout Coach

haltakov · x · 2026-11-11

Indie developer haltakov is building a suite of five "Simple" apps, each designed to cut a few steps out of everyday tasks. Simple Muscle, an iPhone workout tracker, lets ChatGPT or Claude read your goals and every logged set, then write and adapt your training plan — e.g. bumping your Friday top set after noticing bench rose 7.5 kg in 8 weeks, or swapping squats for leg press when your lower back hurts. Sets are logged from the lock screen, and all AI interaction happens in the chat you already use. The other four apps: Simple Post (adapt one post for every social network), Simple Listen, Simple Photo, and Simple Unmark.

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