Last updated: November 3, 2026
Sightglass is an iPhone app for HVAC and refrigeration technicians: superheat, subcooling and airflow checks, and pressure-temperature charts for common refrigerants. Every calculation runs on your phone.
Nothing. Sightglass has no accounts, no ads, no tracking, no analytics and no third-party SDKs. The readings you type, the refrigerant you pick, your units and your elevation stay on your iPhone, in the app's own settings, and are never sent to us or anyone else. We have no server that receives data from this app.
Sightglass makes no network requests of its own and works with no connection at all. Subscription purchases and restores are handled entirely by Apple's App Store, and Apple's own privacy policy applies to those. We never see your Apple Account.
Sightglass is not directed at children and collects no personal information from anyone, including children.
If this policy ever changes, the date at the top changes with it.