Privacy Policy

Calix · Last updated: 18 October 2026

Calix (“the app”, “we”, “us”) is a workout and training app operated by an independent developer. This policy explains what data the app collects, why, and your choices. It also covers the waiting list on calixtenics.com. We keep data collection to the minimum needed to run the app.

What we collect

Account information — by default the app creates an account bound to your device: it generates a random secret that stays on your phone and sends us only a hashed form of it, so such an account has no email address and no password. If you signed up with an email address instead, we store that address and your password (only as a securely hashed value, never in plain text). Optionally a display name if you provide one.
Onboarding answers — what you tell the app during its first run: age, body weight and height, sex, how much of each movement you can already do, any injuries or areas you mark as sensitive, the equipment you have, and how you want to train. They decide your training level and which programs you are shown. If you draw the optional commitment signature, it is stored with them.
Training data you create — your workout, session, and program activity: completed sessions, elapsed time, and program progress.
Waiting-list email — if you join the waiting list on calixtenics.com, the email address you enter, whether and when you confirmed it, when we sent the confirmation email, and the short tag of the Calix link you arrived by, if it carried one (for example "ig" for our Instagram profile), so we can count which of our links bring people. Nothing else: joining creates no account, and the website sets no cookies and loads nothing from other sites.

What we do NOT collect

No analytics or usage-tracking SDKs.
No advertising identifiers and no ads.
No location data.
No contacts, photos, or device files.
We do not sell your data or share it with third parties for marketing.

How we use your data

To create and secure your account and log you in.
To work out your training level from your onboarding answers and recommend programs that match it.
To save your training activity so it is available every time you open the app — and, if your account has an email sign-in, on any device you sign in on.
To email the waiting list: one email to confirm your address, and one the day Calix opens to everyone. We send nothing else to it.

Where data is stored

Data is stored on a private server located in Germany (EU). Traffic between the app and the server is encrypted in transit (HTTPS/TLS). Waiting-list emails are delivered by Resend, which receives your address only to send them.

Data retention & deletion

We keep your account data until you ask us to delete it. To delete your account and all associated training data, email us at the address below and we will remove it within 30 days. If your account has no email, include the account id shown in the app's Settings, so we can find it. Afterwards we keep only the date and the note "deleted on request", nothing that identifies you.

Leaving the waiting list

Every email we send to the waiting list has a link to leave it; following it and pressing "Leave the list" deletes your address straight away. You can also email us at the address below. An address that is never confirmed is deleted automatically after 30 days; a confirmed one is kept until you leave.

Children

Calix is not directed to children under 13, and we do not knowingly collect data from them.

Changes to this policy

If this policy changes, we will update the date at the top of this page.

Contact

Questions or deletion requests: contact@calixtenics.com