Support
Email info@stackwiseapp.net and you'll get a reply from a person.
Apple Health shows no data
Two usual causes. The iOS Simulator has an empty Health store, so try a real device. And correlations need at least ten days where a supplement was sometimes taken and sometimes missed — charts appear immediately, signals take a few weeks.
A barcode didn't scan
The NIH label database covers US products and does not record a barcode for every label it holds. When a code isn't found there, Stackwise asks Open Food Facts what the product is and searches NIH by name instead. If that still comes up empty, type the supplement facts panel in once — Stackwise recognises the bottle the next time you scan it.
Why does it say "no clear signals yet"?
Because it is being honest. Stackwise runs on the order of a hundred correlations and corrects for that, so weak associations that other apps would report as findings get filtered out as likely chance. It reports how many associations it tested next to how many survived.
Restoring a subscription
Me → Restore purchases, signed in with the Apple Account that bought it.
Deleting your data
Everything is on your device. Me → Delete everything clears it, and deleting the app removes all of it.