Built for the training, not the data harvest.

What we build

An app that generates a training week from your answers, prescribes the sets, suggests the weight, records what you actually did, and reads the health data your phone already keeps — all without an account, a server, or a network connection.

How it is made

The training logic — plan generation, progress calculations, the muscle map, the weight prescription — lives in a shared Kotlin core that is unit-tested independently of any screen. The iPhone app is SwiftUI on top of it. Apple Health is reached through a single platform boundary, so HealthKit never leaks into the rest of the app.

What we will not do

• Sell or share your health data. It never reaches us in the first place.
• Add analytics that follow you around the app.
• Invent numbers. If Apple Health has nothing, the app says so rather than showing a zero.
• Claim medical authority. This is a fitness tool, not a clinician.

Get in touch

We read everything sent to sumesphere@gmail.com, and the support page is kept up to date with what people actually ask.