Purchases

Subscriptions and lifetime unlocks are managed by Apple. Restore purchases from the app's Pro screen, or manage subscriptions in your Apple Account.

ChemKeys

ChemKeys is the optional chemistry keyboard. It works without Full Access, so it has no network access and cannot transmit what you type.

Data sources

Element, molecule, spectrum, isotope, and reference data are credited in the app's Settings and data ledger.

Contact

Email qiujsh@gmail.com with your device model, iOS version, and a short description of the issue.