IronMath

Privacy

Last updated September 26, 2026

IronMath is a barbell calculator. It is offline-first, has no ads, and does not track you.

What stays on your phone

Weights, units, gym plate counts, rest-timer run state, scratch calculator inputs, and your set log stay on your device in local app storage. They are not sent anywhere unless you turn on sync with an account.

Optional account and sync

You can use IronMath without an account. If you create an optional IronMath account, we store your email, the name you enter, and the workout data you choose to sync (logged sets, lifts, gym profiles, 1000 lb Club numbers, and settings) on Berth, so you can restore them on another phone.

• Sync uses Berth end-user authentication.
• The app ships only Berth's publishable key.
• You can delete your account in Settings. That removes your Berth user and the backed-up rows. Data that stayed only on the phone is not deleted by that action; deleting the app removes it.

Ads and analytics

There are no ads and no third-party analytics in the app. This website has no trackers and sets no cookies.

Contacting us

If you contact us, we only see what you choose to send.

Questions

Email hello@atberth.com.