# RPN-67 SD — Vintage Programmable Calc > Vintage Hewlett-Packard HP-67 programmable calculator simulation for iPhone. (iPhone/iPad app by CuVee Software.) - Source: https://appshunter.io/ios/app/rpn-67-sd/id1109722386 (this page in markdown: same URL + `.md`) - Developer: [CuVee Software](https://appshunter.io/developer/424873503) - Category: Utilities, Productivity - Price: $3.99 - Rating: 4.60/5 from 17 App Store ratings · 14 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 63 MB - Languages: American English - Released: 2016-05-04 - Data updated: 2026-08-26 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/rpn-67-sd/id1109722386/reviews.md ## What is RPN? A dream calculator of the mid-70's, priced at $2,500 in today's dollars (2025), right on your iPhone! RPN-67 SD is the iPhone version of RPN-67 Pro, the first complete simulation of Hewlett-Packard's legendary HP-67 programmable calculator for the iPad. Produced from 1976 to 1982, the HP-67 was a huge success among scientists, engineers and other professionals. Thousands of programs were written for it. Now you can run them right on your iPhone, with more ease and faster than ever before. To get you started quickly, run the built-in program cards, or choose from the large number of programs available as free downloads from our website. What users said: “This version permits you to use your virtual HP-67 just as you could the original – hand-held and highly portable. Congratulations to the developer for providing such an excellent and aesthetically pleasing software product." "This was my first scientific calculator in real life. It is great to have the simulator on my iPhone. The special features added make it into a HP-41 or 42S! It comes packaged with some great samples. Am having great fun with it." Features: • Virtual program and data cards • Virtual paper tape printer supports all HP-97 printer modes • Powerful database-driven card manager • Create, label, and organize a virtually unlimited number of cards • Use iTunes to effortlessly save entire card collections on your Mac/PC • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • Editable listing shows labels, targets of branches, and errors • E-mail listings and let the recipient paste the text right into RPN-67 • Print listings on any AirPrint-compatible printer • Program listing on paper tape shows subroutine nesting • Edit paper tape • E-mail paper tape, or print it via AirPrint • Cut/copy/paste displayed value or program steps • Paste existing HP-67 listings into RPN-67 SD and run them • "Live" display of stack, memory registers, flags • Show and edit program instructions • Fast: 1.5 seconds vs. 6 minutes (program HM-05, determinant of 5x5 matrix) • Low-battery indicator (iPhone charge 10% or less) • Optional high-contrast mode for working in bright ambient light • Compatible with RPN-67 Pro and RPN-97 Pro While RPN-67 SD works like a real HP-67, changing a simple setting will turn the app into a super-charged HP-67: • Up to 999 program steps, 8 subroutine levels, 6 additional flags (F4...F9) • 100 additional registers • 100 additional labels • 100 built-in constants and conversions • More than 150 additional powerful operations and functions Plus: • 15 commands to print and manipulate any range of extended registers • Unrestricted register arithmetic • Exchange x with any register • Complex numbers, hyperbolic functions • Non-volatile memory - stack, registers, program, flags, paper tape • Status indicators for prefix keys (f, g, h, STO, RCL, etc.) • Display showing thousands separators (optional) • Text output on simulated paper tape in 10 colors, even simple plotting • Stack-of-stack: push/pop the entire stack on internal stack (4 levels) • Single-step into subroutines (optional) • Powerful debugging aids, including 10 breakpoints with counters • Keycodes translated to command names while entering or single-stepping a program • Change the duration of the PAUSE command • Compress constants in programs into a single step (reversible) RPN-67 SD comes with more than 130 programs pre-installed, including HP Standard Pac, HP Business Decisions Pac, HP Math Pac I, HP Stat Pac I, and HP Surveying Pac I. The simulator has been verified to correctly run the examples given in HP Civil Engineering Pac I, HP Clinical Lab Pac, HP E.E. Pac I, HP Games Pac I, HP M.E. Pac I, HP Navigation Pac I, as well as large number of programs published in Users' Library Solutions. For more information and free program downloads visit the RPN-67 website: cuveesoft.ch/rpn67 ## Key features - Virtual program and data cards - Virtual paper tape printer - Database-driven card manager - Create, label, and organize unlimited cards - Share cards via email, AirDrop, Dropbox - Editable program listings - Enhanced features for more program steps and registers ## Recent user reviews (10 of 14) All indexed reviews: https://appshunter.io/ios/app/rpn-67-sd/id1109722386/reviews.md ### 2/5 — キー *2026-02-24* キーの黒ラベルがよく見えません。改善お願いします。他のアプリではこの問題はないのですが・・・ ### 5/5 — One of the best apps for iOS *2025-12-07* Amazing authentic replicate And it just works and it looks phenomenal! ### 5/5 — Faithful simulation and super useful calculator *2023-05-16* Incredibly well implemented. ### 5/5 — Very good, but found a math error *2020-04-22* I used a HP-67 for years and loved it. This app makes me feel at home. However, I recently found a small, but significant math error. With the display set to 2 decimal places, enter the number 28,361.48. When entered, the number rounds to 28,361.50. I was doing a financial calc and this was the error. Update! Problem fixed! The Developer said it was caused by a precision change in IOS. **Developer response:** A change in iOS 13 caused numbers to be reduced to 6 significant digits, in vintage mode only. Fixed in version 4.0. ### 5/5 — RPN 67-SD *2020-02-16* I am an owner and long time user of a real world HP-67 which has some technical problems. Because this was such a fantastic device, I have since been using the iPhone version of the RPN 67-SD. Unfortunately this has also now stopped working. It just started crashing when I opened the app. So I deleted it and re-downloaded it. But now it crashes whilst I am trying to perform calculations. Ian H **Developer response:** Version 4.0 had a bug with scientific display format that only affected certain regions – Australia among them – and therefore went undetected for a while. Fixed in version 4.0.1. ### 5/5 — Love this app *2020-01-09* Excellent simulation of the calculator I had in college. Wish there was a Hp 97 version for the iPhone. ### 5/5 — Eine großartige Emulation! *2018-11-14* Ich habe keine bessere Software-Emulation für den guten alten HP-67 gesehen. Diese App lässt einen nicht nur das Gefühl bekommen, diesen Taschenrechner in der Hand zu halten, sie bietet einem auch an, diesen noch weiter 'aufzupeppen'. Wohlgemerkt, das ist ein Angebot. Mehr Programmschritte, mehr Speicher und vieles mehr. Dazu gibt es auch weitere schöne Funktionen wie die Randomfunktion, die das Original leider missen ließ. Aber das schönste an dieser App ist das uneingeschränkte Zusammenspiel mit der Partnerapp für den iPad, den HP-97 Tischrechner. Was auch unbedingt erwähnt werden muss ist der großartige Support. Kompetent, hilfsbereit und freundlich. Alles in allem einfach nur klasse! ### 4/5 — I owned a 67 *2018-04-04* Good replica of 67. I have one issue that could be quickly solved. When I press the f or g key and then the display key, and enter a 4, the number of digits does not change from 2 to 4 and I would be happy. **Developer response:** Hi, what you describe is not how a real HP-67 works. f DSP simply sets FIX mode, g DSP sets SCI mode (and h DSP sets ENG mode). If you then type 4, you're starting a new number entry. To change the number of digits to 4 in any of the aforementioned modes, simply type DSP 4. If you have further comments or questions, please use the contact link at cuveesoft.ch. ### 5/5 — Best RPN calculator *2017-10-08* This was my first scientific calculator in real life. It is great to have the simulator on my iPhone. The special features added make it into a HP-41 or 42S! It comes packaged with some great samples. Am having great fun with it. ### 5/5 — Really cool throwback. *2017-10-06* My first HP calculator was an HP 29. A few years later, I got an HP 67. Later I bought a 15C and when I started an MBA program i got a 12c. It means a lot to have a really faithful representation of my old friend. I currently have this emulator plus a 12c and 15c (from different a vendor) on my iPhone. I love them all. Take it from somebody who know, all the emulators replicate their real world counterparts. ## Frequently asked questions about RPN ### What is RPN-67 SD? RPN-67 SD is an iPhone application that simulates the functionality of the vintage Hewlett-Packard HP-67 programmable calculator. It aims to provide a highly accurate and portable experience of using the original device. ### How much does RPN-67 SD cost? RPN-67 SD is a paid application, available for $3.99. This one-time purchase grants you access to all its features without any additional in-app purchases or subscriptions. ### Is RPN-67 SD compatible with other RPN calculator apps? Yes, RPN-67 SD is compatible with RPN-67 Pro and RPN-97 Pro. This allows for a seamless transition or integration if you use other applications from the same developer. ### Can I run programs from the original HP-67 on RPN-67 SD? Absolutely. You can paste existing HP-67 listings directly into RPN-67 SD and run them. The app is designed to be highly compatible with programs written for the original calculator. ### Does RPN-67 SD have ads? No, RPN-67 SD is ad-free. As a paid application, it provides an uninterrupted user experience without any advertisements. ### What devices does RPN-67 SD support? RPN-67 SD is designed for iPhone and iPod Touch devices. It is not currently available for iPad or other platforms. ### How often is RPN-67 SD updated? The latest version of RPN-67 SD was released on October 17, 2025. While specific update frequency isn't detailed, this indicates ongoing development and support for the application. ### What are the benefits of the enhanced features in RPN-67 SD? The enhanced features in RPN-67 SD significantly expand its capabilities beyond the original HP-67. These include up to 999 program steps, more registers, additional flags, and over 150 extra operations, making it a much more powerful tool. ## Version history (last 5 releases) ### 5.4 — 2025-10-17 • Improved compatibility with iPhone Air and iOS 26. ### 5.3 — 2025-05-11 • Faster startup – no delay until the first button press is recognized after switching on. • Card details view: new Cancel button in the Activities list allows easy dismissing. Or simply tap outside dialog. Bug fix: In program view (tap display in W/PRGM mode), selecting a label at the bottom didn't clear the current selection. ### 5.2 — 2025-03-09 • In "Max" mode, results such as 9.99×10⁹⁹ now appear correctly rounded both in the display and on the printer for all decimal point settings, e.g. SCI DSP 1 (in contrast to the original HP-67). • Certain calculations, e.g. 100⁷⁵, caused the app to crash. ### 5.1 — 2024-10-30 • The program listing view supports two fonts. Long-press the listing to switch. (iOS 13 or later only.) • Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max. ### 5.0 — 2024-07-07 • In interactive mode, the g-shifted functions in the top row (DAT+, DDYS, ...) automatically switch to the appropriate display format for the duration of the selected pause length. • Thousand separators are now supported in "High-Contrast Display" mode. • Toggle "High-Contrast Display": f double-tap display • Toggle thousand separators: f triple-tap display • Swiping the empty card slot left opens the Card Manager. • The default angular mode indicator DEG goes out after the selected pause length. • Updated math functions supporting the OP SOLAR command. ## Apps similar to RPN | App | Rating | Price | Category | | --- | --- | --- | --- | | [RLM-11CX](https://appshunter.io/ios/app/rlm-11cx/id1630739014) | 3.1 (7) | Free | Utilities | | [RCL-57](https://appshunter.io/ios/app/rcl-57/id1621959742) | — | Free | Utilities | | [Meshtastic](https://appshunter.io/ios/app/meshtastic/id1586432531) | 4.2 (751) | Free | Utilities | | [Plus42](https://appshunter.io/ios/app/plus42/id1597963622) | 4.9 (79) | $9.99 | Utilities | | [Free42](https://appshunter.io/ios/app/free42/id337692629) | 4.8 (283) | Free | Utilities | | [HP15C: Scientific Calculator](https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693) | 2.7 (3) | $4.99 | Utilities | ## More apps by CuVee Software - [RPN-45 HD](https://appshunter.io/ios/app/rpn-45-hd/id424873500) - [RPN-70 HD](https://appshunter.io/ios/app/rpn-70-hd/id436127144) - [Smart Sudoku](https://appshunter.io/ios/app/smart-sudoku/id457564906) - [Vintage-45](https://appshunter.io/ios/app/vintage-45/id506402272) - [RPN-45 SD](https://appshunter.io/ios/app/rpn-45-sd/id509923051) - [RPN-67 NP](https://appshunter.io/ios/app/rpn-67-np/id603100249) All apps by CuVee Software: https://appshunter.io/developer/424873503 ## Related topics [cuvee software](https://appshunter.io/ios/topics/cuvee-software) · [touch rpn](https://appshunter.io/ios/topics/touch-rpn) --- *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 2026-08-26.*