CalcStak — Support

CalcStak is a reverse-Polish-notation calculator for iPhone. This page is where you can find help if something isn't working.

Contact

The fastest way to reach us is email: support@rosinbum.org.

We typically reply within a few business days. CalcStak is built by an indie developer; we appreciate your patience.

Frequently asked

How does an RPN calculator work?

Instead of writing (2 + 3) × 4, you push the operands onto a stack and apply operators after them. The same calculation in RPN is: 2, enter, 3, +, 4, ×. The stack always shows what your operands are; there is no equals key and no parentheses.

If you've used an HP-12C, HP-48, or any Forth-style language, this will feel familiar.

Where is my calculation history stored?

On your device. The app does not transmit, back up, or sync your data anywhere.

How do I clear history?

Open the Settings tab (gear icon) inside CalcStak and tap "Clear history". You can also clear everything by deleting and reinstalling the app.

How do I switch between degrees and radians?

Tap the angle-mode chip (DEG / RAD) above the keypad to toggle between modes. The setting is also configurable in the Settings tab.

How do I find the app version?

Open the Settings tab inside CalcStak; the version and build number are shown at the bottom.

Will you add (cloud sync / Apple Watch / iPad / equation editor / …)?

Maybe. Email us with the request — we read every one. No promises on timeline.

Reporting bugs

If you hit a bug, the most useful information you can send is:

1. iPhone model and iOS version (Settings → General → About).
2. App version (Settings tab inside CalcStak).
3. Steps to reproduce.
4. What you expected vs. what happened.

Send to support@rosinbum.org.

Privacy

See our privacy policy. Short version: the app collects nothing and makes no network requests.