Kallen — the posture app that measures first. Earn 30% of every payment, recurring.

Posture, mobility and health creators. You already answer “what do I do about my neck?” in every comment section. Kallen is the answer that keeps working after the video ends — and every subscriber who names you keeps paying you, month after month.

Physiotherapists with a local practice. Most of your followers live in the wrong city to ever book an appointment with you, so today they are worth nothing to you. Those are exactly the people this turns into recurring income — and not one of them was ever going to take a slot in your calendar.

Desk-work, remote-work and productivity creators. Forward head, rounded shoulders, a lower back that gives up in the sixth hour of sitting: that is not a fitness topic, it is a home-office topic, and it belongs in the video you are already making about your setup.

The scan is the hook. A phone, a wall, a few seconds — then a screen full of the viewer’s own numbers. It is a before/after you can shoot in one take.

It is honest, so you can be too. It measures what limits a movement instead of guessing, it says when something belongs with a real physio, and it asks the user to approve every change to their plan.

Nothing leaves the phone. No account, no cloud, no sign-up wall — for an audience tired of handing over an e-mail to see a stretch, that objection is simply gone.

Free to download, plan included. Kallen Pro is what lifts the weekly scan limit, so your audience meets the product long before the paywall.

English and Polish, fully localized — a Polish-speaking channel is not the smaller opportunity here.