Most tracking apps make you tap through a form before you've done a single rep. I wanted the opposite: open the app, hit one red button, and you're training.
That's the core idea behind Delts. The red button starts the session and ends it. While it's running, a Lock Screen Live Activity keeps the timer in front of you, so you don't have to wake the app or context-switch mid-set.
I'm a solo iOS dev and an ACE Certified Personal Trainer, so the design constraint was simple: the app should never get between you and the next set. Timer-first tracking falls out of that. The session is the unit of work, not a spreadsheet row you fill in afterward.
Built in SwiftUI, iOS 17+. The core app is free and the whole thing is open source under MIT.
More on the build to come this week. Tagline says it best: train with the red button.
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