Deltz is a strength-training app. You plan workouts, log every set with its load and effort, and keep a weekly streak that forgives a missed day. It reads and writes workouts through Apple Health and stores everything on the device first.
How it's built
The iPhone app is SwiftUI with SwiftData and HealthKit, and the Android app is native Kotlin. An operator console runs on Cloudflare Workers and D1. It is in private testing.