Last updated: 26 July 2026
HeatTreat is an offline steel heat treatment calculator and reference. It computes critical temperatures, retained austenite, tempering equivalence and carbon equivalents from published correlations, entirely on your device. It has no account, no server, and no way to reach the internet. This policy explains, plainly, what that means.
HeatTreat stores exactly one thing: whether you prefer Celsius or Fahrenheit. That single preference lives in the app's private storage on your device so the app remembers it next time you open it. Nothing else is written anywhere.
The composition you type into the calculator, the grade you look up, and the tempering figures you enter are held in memory only while you are using the screen. They are not saved to disk, not kept in a history, and not sent anywhere. Close the app and they are gone.
Most apps that promise privacy still ship with the ability to reach the internet and simply choose not to use it. HeatTreat does not have that ability. The release build declares no INTERNET permission, which means Android itself will refuse any network request the app might make. You can verify this on the app's Play Store listing, where the permissions section will show none, or with any APK inspection tool.
The grade database, all equations, and all citations are bundled inside the app. Nothing is fetched, and there is nothing to fetch.
HeatTreat does not collect names, email addresses, contacts, location, photos, device identifiers, usage analytics, crash reports, or any other personal information. It does not know which grades you looked at, what chemistry you entered, or that you opened it at all. There is no mechanism by which it could report any of this.
HeatTreat requests no runtime permissions. It does not ask for camera, photos, storage, microphone, location, contacts, or notifications. The only entry in its manifest is an Android system permission that the app defines for itself, which grants no access to your device or your data and is added automatically by the Android support libraries.
HeatTreat gives engineering estimates from published empirical correlations. It is not a certification tool and does not issue specifications. Correlations carry scatter, and your steel, your furnace and your quench are not the ones the equations were fitted on. Every result in the app shows its equation, its source, and the range over which that source is reasonable, so you can judge it yourself. Verify against the applicable standard, your supplier's data, and your own test coupons before committing work.
HeatTreat does not knowingly collect any data from anyone, including children. There is nothing to collect.
If this policy ever changes, the updated version will be posted at this same address with a new date above. Any change that would affect data handling would be described here before it took effect.
Questions about this policy can be sent to contact@futigo.io.