RPN Calc vs ELCON smartACCESS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Calc
This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.
- Reverse Polish Notation (RPN) input
- Clean, simple interface
- Large, easy-to-press buttons
- iPhone, iPad, and Apple Watch support
- Today Extension for quick access
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A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch! If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier than your computer or calculator. And, remember those cool calculator watches from the 1980s? Unfortunately, none of them were RPN. RPN Calc brings a reverse polish notation watch calculator to the Apple Watch! In addition to the standard RPN Calculator app that runs on iPhone, iPad, and Apple Watch, RPN Calc includes a handy micro RPN Calc Today Extension available for convenient access to quick calculations from the pull down Today screen.
ELCON smartACCESS
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we can provide a Bluetooth key to replace the traditional physical key. You can also generate new Bluetooth keys or keyboard passwords and send them to the visitors via phone, to remotely control your locks.
Screenshots
Verdict
The clearest difference is price: ELCON smartACCESS at Free against RPN Calc's $0.99. ELCON smartACCESS also leads on iOS requirement (13.0 vs 16.0). RPN Calc's advantage is update cadence (every 3 months vs every 15 months). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
ELCON smartACCESS is free to download; RPN Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPN Calc ships an update every 3 months, ELCON smartACCESS every 15 months. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.
| Parameter | RPN Calc | ELCON smartACCESS |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.0 (6 ratings) — better | — |
| Positive reviews | 37.9% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 months — better | Every 15 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 339 MB |
| Age rating | 4+ | 4+ |
| Developer | James Mattis | ELCON Sicherheitstechnik GmbH |
In-app purchases
RPN Calc
No in-app purchases
ELCON smartACCESS
No in-app purchases
