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Principles STAH-dig · Norwegian for steady

Steady, by design.

Stadig is Norwegian for steady. The apps are built for the long game: years of training and eating, not a thirty-day challenge. These are the rules both apps follow, and the ones new work is checked against.

  1. Prescribe, don't describe

    A chart tells you what happened. Stadig apps tell you what to do next. Every insight ends in one concrete action, and the plan is written for you, with a Why if you want it.

  2. Real-world tests, not time in the app

    Strength moves on lifts, Endurance on heart-rate benchmarks, Agility on mobility tests, Physique on the tape. Opening the app or time spent in it moves nothing.

  3. No XP and no streaks

    Discipline is a rolling four-week adherence rate with an 80 to 90 percent target band. Above it earns nothing extra, and one miss barely dents it. Rest is part of the plan. A day you didn't log is unknown, not a failure.

  4. Offline first

    The exercise library and the food and supplement catalogs ship inside the apps. They work on a plane and in a basement gym. iCloud sync is there for your own devices.

  5. Private by construction

    No account. No analytics. Your data lives on your devices and in your iCloud. Where an app uses a language model, it's Apple's on-device model, or Private Cloud Compute only when you allow it. Progress photos are never analysed.

  6. Free, all of it

    Both apps are free: every plan, every target, every way to log. Nothing to unlock, no tiers and no ads. Export and backups are built in, so your data is always yours to take.

  7. No third-party code

    Swift, SwiftUI, SwiftData and Apple's frameworks. No SDKs phoning home, no trackers, nothing to break when a vendor changes terms.

The scores What moves each one

Six scores, and what moves them.

Each app shows the scores it measures: Strength, Physique, Endurance, Agility and the training half of Discipline in Stadig Lift; Vitality and the nutrition half of Discipline in Stadig Macro. With both set up, each app shows all six and says which app measures each one.

  • Strength

    Stadig Lift

    Estimated maxes on free-weight lifts, against bodyweight standards.

  • Physique

    Stadig Lift

    The tape: waist to height and your proportions.

  • Endurance

    Stadig Lift

    VO₂ max, resting heart rate, benchmarks and weekly cardio.

  • Agility

    Stadig Lift

    Five mobility tests. The weakest is named.

  • Discipline

    Stadig Lift + Stadig Macro

    Four weeks of the plan kept, in the gym and at the table.

  • Vitality

    Stadig Macro

    How steadily you log your food.

Discipline, defined

Discipline is the one score both apps share. It is a rolling four-week adherence rate against the planned days, with a target band of 80 to 90 percent. Going above the band earns nothing extra. One miss barely moves it. Rest days are planned days and count as kept. A day with nothing logged is unknown, not a failure. Vacation, illness and exempt crunch days never count either way.