Sterkt is free to download, and the free version is a real starter kit: the written guide and safety warning for every exercise, the hand-drawn animated form check for 22 of them, and one routine — no cut corners on the free tier.
Sterkt Pro unlocks the animated form check for all 60+ exercises, unlimited routines, and every routine template. It is $2.99/month or $19.99/year with a 1-week free trial — both renew automatically until you cancel, which you can do any time in your Apple Account settings. There is also a $34.99 lifetime option that is a single payment and never renews.
Yes. Each stick-figure animation is drawn from technique described in reputable strength-training sources, not guessed at from a photo.
Every exercise also lists the common mistakes people make with it and the specific way it can hurt you if you get it wrong. The safety warning sits right next to the animation, not buried in a disclaimer nobody reads.
No. Sterkt has no account, no analytics, and no servers of its own. Your routines, every logged workout, and your preferences are stored in a single file on your device and nowhere else. Full detail is in the Privacy Policy.
Sterkt can remind you on training days using ordinary local notifications, scheduled and delivered entirely on your phone. They are never routed through a server — nothing about a reminder leaves the device. Permission is only requested when you turn reminders on.
Yes — that's how a routine works in Sterkt. Write it once and split it across your training days, each pinned to a weekday: the free Full Body ×3 programme, a shape of your own, or, with Sterkt Pro, a push/pull/legs or upper/lower template.
Each day is its own page in the notebook, with its own exercises, sets, reps and form checks, ready before you leave the house.
Both — pick your unit in Settings and weights are written in it. Sterkt doesn't convert numbers you've already logged, so pick the unit your plates are in.
Sterkt requires iOS 18 or later.
Open Settings inside Sterkt and tap Restore Purchases, or use the same link on the paywall. As long as you're signed in with the Apple Account that bought Sterkt Pro, the unlock comes straight back. There's no separate account to sign into and nothing to pay again.
No. Sterkt gives general training information — form checks, routine structure, and notes on eating and recovery — not a personalized program and not medical advice.
Consult a doctor, physiotherapist, or qualified fitness professional before starting a new exercise program, especially if you have a pre-existing condition, and stop any movement that causes pain.
Yes. The exercise library, your routines, session mode and your training log all work fully offline — there is nothing in Sterkt that needs a connection, because there is nothing in Sterkt that talks to a server.
Email muddermister@gmail.com. It helps to say which iPhone and iOS version you're on, and what you were doing when it happened.