Touch RPN Calculator

Contains adsIn-app purchases
3.7
6.41K reviews
1M+
Downloads
Content rating
Everyone
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About this app

Touch RPN, formerly known as Touch Fin, is an RPN calculator. This app implements many features of the industry-standard HP-12C.

This app offers many additional flavors of RPN calculators, including financial, scientific and for computer programming.

Two flavors are available for free (ad-supported): financial and scientific. Additional ad-free flavors are available for purchase within the app. The purchased flavors also offer vertical layout and saving memory to files.

Press the ON key to change Settings, choose the active flavor, and purchase additional flavors.
Updated on
Jan 8, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity, and Device or other IDs
This app may collect these data types
Location, App activity, and Device or other IDs
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

3.7
6.28K reviews
John Wagner
January 29, 2021
I really dig it. I have the original from HP and it's excellent. This is the same thing exactly but now I don't have to carry both units. Woulda given 5 stars for no ads but they're kinda small so not that big a deal. Ps., I have figured out a way to beat the ad thing but I won't publish it, not for now anyway. Just letting you know that it is possible.
4 people found this review helpful
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Stephen Shank
September 7, 2020
The paid version now has ads. The developer explains this happened when they consolidated the different versions in the app store into a single version with "flavors" and lost track of who had paid. I fixed mine by opening the app, pressing the "ON" button and choosing "flavor" as "Financial Premium". No additional payment was requested.
31 people found this review helpful
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Michael Zinn
December 25, 2025
Good calculator, the only really annoying issue is that it randomly switches to the i11 version with ads about once per year. Couldn't you change it so that when it loses the settings, it switches to an ad free one if the user bought one? I only bought i15, which is the only calculator I use, so this would fix the issue for me.
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STENDEC
July 12, 2024
Hi, you can restore purchases following the guide at https://stendec.io/ctb/touchfin/purchase.html. It indeed reverts to the default flavor (financial) if you reinstall the app, or replace your phone, but you can change the flavor easily at Settings (key ON).

What’s new

Internal update
Bugfixes in operations INTEG and RCL infix (thanks to Mr. Huysegoms for the reports)