Account Information (Optional)
If you choose to create an account, we collect your email address and a securely hashed password (we never store your plain-text password). Account creation is entirely optional — all calculators can be used without registration.
Saved Projects & Calculations (Optional)
Registered users may save calculation inputs and results. This data belongs to you and is only used to provide the save/restore feature. We do not analyze, sell, or share your engineering calculations.
Anonymous Usage Analytics
We collect anonymous page view data (page visited, approximate country, session duration, browser language) to understand how the app is used. No personally identifiable information is stored. Your IP address is never stored.
Push Notification Tokens (Mobile Only)
If you use the mobile app and grant notification permission, a Firebase Cloud Messaging (FCM) token is stored to deliver push notifications (e.g. electricity price alerts). You can revoke this permission in your device settings at any time.