Terms of Service

Last updated: 18 August 2026

These terms govern your use of the StrengthOS mobile app ("StrengthOS", "the app"). By using StrengthOS you agree to them.

The app

StrengthOS is a log for lifters. You record sets, reps and load while you train, and it turns that history into an honest read on progress, volume and training frequency. StrengthOS runs entirely on your device.

StrengthOS is not medical advice

StrengthOS is a personal tracking tool, not a medical device. It does not diagnose, treat, cure or prevent any condition, and nothing it shows you is medical advice. Talk to a qualified professional before changing your diet, training or medication, particularly if you have a health condition, are pregnant, or are recovering from injury or illness. If you think you have a medical emergency, contact your local emergency services.

Your data is yours

Everything you enter stays on your device. We do not receive it, so we make no claim to it and can neither retrieve nor restore it. Keeping it safe — through your own device backups — is up to you. See the Privacy Policy.

Accuracy

StrengthOS calculates from reference data and from what you enter. Reference values are approximations, and what you enter may be estimated. Treat every number as a useful estimate rather than a measurement, and do not rely on StrengthOS where precision matters medically.

Availability

StrengthOS is provided as is, without warranty of any kind. We may change or discontinue it at any time. Because it runs entirely on your device, an update from us is never required for it to keep working on the version you have installed.

Liability

To the maximum extent permitted by law, thetinyapp and its contributors will not be liable for any loss or damage arising from your use of StrengthOS, including any decision made on the basis of what it displays.

Contact

Questions about these terms? Email resources@thetinyapp.com.