Support
Questions, bug reports, and feature requests all go to one place — and a person reads every one.
Expect a reply within a few days. For a bug, it helps enormously to include your iPhone model, your iOS version, and the sequence of keys that produced the problem.
What is reverse Polish notation?
In RPN you enter the numbers first and the operation last. Instead of 12 × 5 = you press 12 ENTER 5 ×. Numbers pile up on a stack, and each operation consumes the numbers it needs and leaves the result on top.
It takes about ten minutes to stop thinking about it, and then it is faster than the alternative — there are no parentheses to balance and no equals key to hunt for, and every intermediate result stays visible instead of vanishing.
How does scanning work?
Open Scan and point the camera at a receipt; it captures by itself when the shot is steady. The receipt then freezes on screen with every amount turned into a key. Press an amount to put it on the stack — nothing is added automatically, and each key you've used is marked so you don't take it twice.
Voice doesn't understand me
Voice listens in the languages already set on your iPhone (Settings → General → Language & Region), and you can switch with the language key. It understands numbers, not commands — say "twelve ninety-nine", not "add twelve ninety-nine". If a number lands wrong, tap the row and fix it.
What does the purchase unlock?
The Full Deck, €2.99 once: the tape (print and share your keystrokes as an image, text, or PDF), scan, and voice. The calculator itself is free forever. The purchase is shared with your family group through Family Sharing, and Restore Purchase brings it to a new iPhone.
Is my data safe?
Yes. RPN Deck collects nothing, and scanning and voice both run entirely on your iPhone. See the privacy policy.
Requesting a feature
Please do. RPN Deck aims to stay small and quiet rather than grow every function imaginable, so not every request will land — but knowing what people actually reach for is what shapes the next version.