The Short Version
531 Tracker is designed with your privacy in mind. All your workout data stays on your device. We collect a small amount of anonymous usage data to understand how the app is used and improve it — never your workouts, never your identity, and you can turn it off in the app's settings. The only time we receive anything personal is when you choose to send us a message through the contact form.
Data Storage
All information you enter into 531 Tracker—including your workout programs, lifting records, and personal records—is stored locally on your device. This data never leaves your phone.
We do not have servers that receive, store, or process your workout data.
Anonymous Usage Analytics
To understand how the app is used and where it can be improved, 531 Tracker collects a small set of anonymous usage events — for example, which screens are viewed, which features are used, when the app is opened, and general app and device information (app version, device model, operating system version).
This data is anonymous by design:
- Events are tied to a random identifier generated on your device — never to your name, email, or any account.
- Your workout data (programs, lifts, weights, records, bodyweight) is never included in analytics events.
- We do not collect precise location, and IP addresses are not stored.
- Nothing is used for advertising, shared with data brokers, or sold — this data exists only to improve the app.
You can turn analytics off at any time in the app under Settings → Privacy. The app works identically with it off.
Where a legal basis is required (e.g. under UK/EU data protection law), we rely on our legitimate interest in understanding and improving our own app, balanced by the minimal, anonymous nature of the data and the in-app opt-out.
Contacting Us
Both the app (Settings → Support → Contact & Feedback) and this website have a contact form for bug reports, feature requests and questions. Using it is entirely optional.
When you send a message we receive what you type — your message, your email address and, if you give it, your name — so that we can reply. Messages sent from the app also include your app version, device model and operating system version, because they are usually needed to investigate a bug. Your workout data is never included.
Messages are delivered to our support mailbox as email and are kept only for as long as needed to deal with your request. Your email address is used solely to reply to you: it is never added to a mailing list, shared with anyone else, or used for marketing.
Data We Don't Collect
531 Tracker does not collect:
- Personal information (name, email, etc.) — unless you choose to send us a message through the contact form, as described above
- Workout or fitness data
- Location data
- Advertising identifiers — we show no ads and do not track you across other apps or websites
Third-Party Services
531 Tracker uses RevenueCat to manage in-app purchases and subscriptions. RevenueCat may collect anonymized purchase data as required to process transactions. For more information, please refer to RevenueCat's Privacy Policy.
Anonymous usage analytics are processed by PostHog, hosted in the European Union, acting as our data processor. For more information, please refer to PostHog's Privacy Policy.
Contact form messages are sent as email using Cloudflare and stored in our support mailbox, which is hosted by Fastmail. Both act as our data processors. For more information, please refer to Cloudflare's Privacy Policy and Fastmail's Privacy Policy.
Your Control
Since all workout data is stored locally on your device, you have complete control over it. Deleting the app will remove all associated data. You can also clear your data from within the app settings at any time.
Anonymous analytics can be switched off in Settings → Privacy inside the app. Deleting the app also discards the random analytics identifier, unlinking any previously collected events from your device.
If you have contacted us and would like your message and email address deleted, reply to the same thread or send a new message through the contact form and we will remove it.
Changes to This Policy
If we make changes to this privacy policy, we will update the "Last updated" date at the top of this page.