Terms of Service

Last updated: November 4, 2026

The Short Version

531 Tracker is a tool that calculates and logs your 5/3/1 training. Use it sensibly, lift safely, and listen to your body — the app does the maths, but you are responsible for what you put on the bar. Subscriptions and purchases are handled by the App Store or Google Play, and you can cancel any time there.

Who We Are

531 Tracker (the "App") and this website are provided by Zub Technologies Limited ("we", "us", "our"). By downloading, installing or using the App or this website, you agree to these Terms of Service. If you don't agree, please don't use them.

If you downloaded the App from the Apple App Store, Apple's Standard Licensed Application End User License Agreement also applies. If you downloaded it from Google Play, the Google Play Terms of Service also apply. Where those terms and these conflict, the store's terms take precedence to the extent required.

Health and Safety

Strength training carries a risk of injury. 531 Tracker provides calculations, templates and tracking tools for general information only. It is not medical advice, and it is not a substitute for a qualified coach, doctor or physiotherapist.

  • Consult a doctor before starting any exercise program, especially if you have an injury, a medical condition or are new to training.
  • Use proper technique, appropriate equipment and a spotter or safety bars where needed.
  • Check that the weights the App suggests are right for you. You decide what you lift — stop if anything feels wrong.

You use the App and follow any training program at your own risk.

Your Licence to Use the App

We grant you a personal, non-exclusive, non-transferable, revocable licence to use the App on devices you own or control, for your own non-commercial use. You agree not to copy, modify, reverse engineer, resell or redistribute the App, or use it in any unlawful way.

The App, this website and their content (other than your own data) belong to us or our licensors.

Subscriptions and Purchases

Some features require 531 Tracker Pro, available as a monthly or annual subscription or a one-time lifetime purchase. Prices are shown in the App before you buy.

  • Payment is charged to your App Store or Google Play account when you confirm your purchase.
  • If a free trial is offered, you will be charged when it ends unless you cancel at least 24 hours before the end of the trial.
  • Subscriptions renew automatically at the same price and length unless cancelled at least 24 hours before the end of the current period.
  • You can manage or cancel your subscription in your App Store or Google Play account settings. Deleting the App does not cancel a subscription.
  • Refunds are handled by Apple or Google under their refund policies — we can't issue them directly.

We may change prices or the features included in Pro in the future. Price changes won't affect a subscription period you have already paid for, and the store will notify you as required.

Your Data

Your workout data is stored on your device, not on our servers. You are responsible for keeping it backed up — we recommend using the App's backup feature regularly. We can't recover data that is lost if your device is lost, reset or the App is deleted.

How we handle the limited information we do receive is described in our Privacy Policy.

About 5/3/1

5/3/1 is a training program created by Jim Wendler. 531 Tracker is an independent tool and is not affiliated with or endorsed by Jim Wendler or J&M Fitness. All trademarks belong to their respective owners.

No Warranty

We work hard to make the App accurate and reliable, but it is provided "as is" and "as available". We don't promise it will be error-free or uninterrupted, or that every calculation will suit your circumstances. Nothing in these terms affects your statutory rights as a consumer.

Limitation of Liability

To the fullest extent permitted by law, we are not liable for any injury, loss of data, or indirect or consequential loss arising from your use of the App or this website. Our total liability to you for any claim is limited to the amount you paid for the App in the 12 months before the claim.

Nothing in these terms limits liability for death or personal injury caused by our negligence, for fraud, or for anything else that cannot be limited by law.

Ending Your Use

You can stop using the App at any time by deleting it (and cancelling any subscription through your store account). We may suspend or end your licence if you seriously breach these terms. We may also update, change or discontinue the App.

Changes to These Terms

We may update these terms from time to time. When we do, we will change the "Last updated" date at the top of this page. Continuing to use the App after a change means you accept the updated terms.

Governing Law

These terms are governed by the laws of England and Wales, and the courts of England and Wales have jurisdiction. If you live elsewhere, you keep any protections given to you by the mandatory laws of your country.

Contact

Questions about these terms? Get in touch through our contact form or from the App under Settings → Support → Contact & Feedback.