# RPN Scientific Calculator > Scientific RPN calculator for iPhone and iPod touch with stack and memory functions. (iPhone/iPad app by Nick Nallick.) - Source: https://appshunter.io/ios/app/rpn-scientific-calculator/id303252045 (this page in markdown: same URL + `.md`) - Developer: [Nick Nallick](https://appshunter.io/developer/303252048) - Category: Utilities, Productivity - Price: $0.99 - Rating: 4.00/5 from 2 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 8.1 · 12 MB - Languages: American English - Released: 2009-01-26 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/rpn-scientific-calculator/id303252045/reviews.md ## What is RPN Scientific Calculator? A scientific RPN calculator inspired by traditional HP calculators but created specifically for the iPhone and iPod touch. It features a standard four level stack with multiple display options, and BCD math for accuracy. Several features provide feedback for tracking the calculator buttons with your finger on the touch screen, including an audio button click and a larger delayed "heads-up" tracking display. • A "paper" tape records transcript for later review. • Provides standard, scientific and engineering display format modes. • Calculator stack and memory values are saved between uses. • Provides ten memory storage locations with arithmetic access functions. ## Key features - Four-level stack - BCD math for accuracy - Audio button click feedback - "Paper" tape for transcript - Standard, scientific, engineering display modes - Ten memory storage locations ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/rpn-scientific-calculator/id303252045/reviews.md ### 5/5 — Very well done *2015-12-25, version 1.2* I used HP rpn calculators back in the day, and this app does a nice job or recreating it. One hint: decreasing the display size increases the space between buttons. ### 2/5 — Needs Work *2010-10-09, version 0* 1. Keys are too small. Need to make them bigger by reducing dead space between them. 2. Don't like how the keys invert when you push the 2nd function button. ### 4/5 — Pretty good *2009-02-01, version 0* It's a lot like the free classic rpn, but looks like an iPhone app. Don't like how the buttons switch when you hit the orange second button. Kinda near at first, but annoying. The stack can be four lines, but the LCD stays the same size so the numbers are really tiny. Overall a nice effort, but not too impressive. ## Frequently asked questions about RPN Scientific Calculator ### What is RPN Scientific Calculator? RPN Scientific Calculator is a utility app for iPhone and iPod touch that emulates the functionality of traditional HP scientific calculators. It utilizes Reverse Polish Notation (RPN) for calculations and offers features like a four-level stack and memory storage. ### How much does RPN Scientific Calculator cost? RPN Scientific Calculator is a paid app, available for $0.99. This one-time purchase grants you access to all its features without any additional costs or subscriptions. ### What devices is RPN Scientific Calculator compatible with? RPN Scientific Calculator is designed for iPhone and iPod touch devices. It is not currently available for iPad or other platforms. ### What is the age rating for RPN Scientific Calculator? RPN Scientific Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions. ### How often is RPN Scientific Calculator updated? The latest version of RPN Scientific Calculator is 1.3, released on January 12, 2016. While the app has not been updated recently, it remains functional for its intended purpose. ### Does RPN Scientific Calculator save calculations? Yes, RPN Scientific Calculator features a "paper" tape that records a transcript of your calculations for later review. Additionally, calculator stack and memory values are saved between uses. ### What kind of display formats does RPN Scientific Calculator offer? RPN Scientific Calculator provides standard, scientific, and engineering display format modes. This allows users to choose the most appropriate format for their specific calculation needs. ### What are the user reviews like for RPN Scientific Calculator? RPN Scientific Calculator has a rating of 4.0 stars from 2 ratings. This suggests generally positive user sentiment, though the limited number of reviews makes it difficult to draw broad conclusions. ## Version history (last 5 releases) ### 1.3 — 2016-01-12 This app has been updated by Apple to display the Apple Watch app icon. • Add long press on backspace to clear the x register. • Fix math bug (e.g., tan(45)). ### 1.2 — 2015-12-21 • Add volume control for key click sound. • Fix calculator stack handling in y^x function. ### 1.1.1 — 2015-01-22 • Fix occasional math bug. • Fix ability to reset trig mode to degrees. ### 1.1 — 2015-01-07 • Updated for iOS 8 and latest Apple technologies. • Scales the display to fit any phone. • Miscellaneous improvements and bug fixes. ### 1.0 — 2009-01-26 No release notes. ## Apps similar to RPN Scientific Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [My RPN Calc](https://appshunter.io/ios/app/my-rpn-calc/id807032892) | 3.0 (2) | $1.99 | Utilities | | [小城经纪人](https://appshunter.io/ios/app/id1459829320) | — | Free | Utilities | | [创衣盒子dBOX](https://appshunter.io/ios/app/dbox/id1462858880) | — | Free | Utilities | | [RPN-67 SD](https://appshunter.io/ios/app/rpn-67-sd/id1109722386) | 4.6 (16) | $3.99 | Utilities | | [SpicyRPN](https://appshunter.io/ios/app/spicyrpn/id1474140612) | — | $9.99 | Utilities | | [GO-29 SciRPN](https://appshunter.io/ios/app/go-29-scirpn/id1472811056) | 5.0 (4) | $6.99 | Utilities | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*