Terms of use
The same terms as every other app on your phone.
Weighted uses Apple's standard licence. Nothing in it will be new to you, since it is the same agreement sitting behind every other app on your phone. Apple publishes the text, and that text governs whatever this page happens to say.
Subscriptions.
Billed by Apple, not by us
What you buy
Weighted Pro, an auto-renewing subscription that unlocks the whole app. There is no separate tier and no one-off purchase.
The trial
Fourteen days, on either plan, run by Apple. It becomes a paid subscription when it ends unless you cancel first.
Renewal
Charged to your App Store account and renewed at the end of each period unless it is cancelled at least 24 hours before that.
Cancelling
In your Apple subscription settings, not in the app. You keep access until the period you already paid for runs out. The steps are on the support page.
Worth saying out loud
It is a logbook, not a coach.
Weighted records what you did and works out what it implies. It does not know your shoulder, your last injury or how you slept, and an estimated one rep max is labelled as an estimate, never as a lift you did.
What you attempt at the bar stays your decision and your risk. If a number here talks you into a weight your elbows disagree with, listen to the elbows.
The licence itself.
Apple's standard End User License Agreement, in full, on Apple's own site. Where it and this page disagree, the licence wins.