Free forever
The free tools include PT charts and superheat and subcooling support with no account needed. If you are exploring HVAC Refrigerant Log, you can start at home, review the features, or join the waitlist.
Paid features
The paid plan unlocks the refrigerant log, leak rate tracking, cylinder tracking, and the PDF audit report. Those features are intended for people who need records and reporting beyond the free calculator tools.
Billing
Billing is handled by Apple. If you cancel, you manage it in your Apple account settings, and any price or trial details are shown in the App Store purchase sheet at the time of purchase.
Reference only. Verify with manufacturer data and gauges. Follow the manufacturer chart and EPA rules. This site is not an approval from EPA.