# Legendary 67 > RPN scientific calculator with programmable features and virtual program cards. (iPhone/iPad app by Fabian Fränz.) - Source: https://appshunter.io/ios/app/legendary-67/id646047448 (this page in markdown: same URL + `.md`) - Developer: [Fabian Fränz](https://appshunter.io/developer/646047511) - Category: Utilities, Productivity - Price: Free - Rating: 4.60/5 from 23 App Store ratings · 15 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 27 MB - Languages: American English - Released: 2013-05-12 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/legendary-67/id646047448/reviews.md ## What is Legendary 67? # Iconic The Legendary 67 revives the spirit of the indeed legendary hp67, one of the first handheld, scientific and programmable calculators. # Powerful Calculations are done step-by-step using reverse Polish notation (RPN), which is very similar to calculating with pen and paper. This gives you full control and lets you spot mistakes early rather than later. In addition it is much simpler than using an algebraic calculator while using less keystrokes all at the same time. Last but not least, RPN makes it super easy to create your own programs. # Programmable Creating programs is exactly like using the calculator, so there is no need to learn any programming language. Simply put the calculator just records exactly the keys you typed and can replay them on demand. Through a small set of nifty features, like conditions, subroutines and flags a vast set of powerful programs is possible. You can program everything from simple snippets like the Pythagorean theorem, implement matrix algebra and even create games. # Batteries included The calculator comes equipped with a handful of useful programs and you can easily create your own. Each program is stored on a virtual magnetic card, with fully customisable labels and descriptions. # Free Now the best part, the app is completely free and does not include any advertisements. # Features: - scientific RPN calculator (Reverse Polish Notation) - 4 element deep automatic stack - 26 storage registers - over 100 on-key functions - realistic sounds - handy descriptions for every single key - every function is recordable in a program - loops, conditional execution and subroutines are possible - programs can hold up to 224 program steps - 5 programmable keys - program cards store programs and/or register content - 16 preinstalled program cards (standard pack) - unlimited count of custom cards - cards contain their own description - program card editor; add custom labels and descriptions - export and import custom program cards - export and import via email - import plain text programs - import "CuVee Software RPN-67 for iPad" program cards - print programs via AirPrint - illustrated manual Please, feel free to send an email to (legendary67@t-online.de), if you have questions or found a bug. Disclaimer In no event, unless required by applicable law or agreed in writing, shall the author be liable for any loss, expense or damage, of any type or nature arising out of use or inability to use this software application. ## Key features - Scientific RPN calculator - 4-element automatic stack - 26 storage registers - Over 100 on-key functions - Programmable with loops and conditions - Virtual magnetic program cards - Export/import program cards ## Recent user reviews (10 of 15) All indexed reviews: https://appshunter.io/ios/app/legendary-67/id646047448/reviews.md ### 2/5 — Looks good but sounds terrible *2024-03-21* I like the look and functionality of the calculator but the sound of the button click is not in line with the calculator look and feel. Wish it was closer to the sound of the actual calculator buttons which was one of the outstanding features of the typical HP calculator. **Developer response:** Thank you for the review. The sounds are actual recordings of an original hp 67. However, as the original is already quite dated (especially the magnet card drive), the sounds might not be the same anymore. Also, the recordings probably cannot capture the true sound. You can disable the sound in the settings or after pressing h E. ### 5/5 — RPN!!! It has Reversed Polish Notation *2022-11-17, version 1.7.0* The first calculator I used with any frequency was a HP 46. Before that was a slide rule. HP used to always make the best calculators. Then I got issued a HP 67. That’s where I first got into programming, and eventually became a real computer programmer. Anyway, as far as I can tell, this is a nearly flawless implementation of one of absolutely best hardware calculators ever. But pardon me for asking for support, is there documentation somewhere in the program? Oh, for those who aren’t familiar with Reverse Polish Notation, (not a slur, it was invented by a Polish guy), and if you do much more than add - subtract, multiply, divide, you owe it to yourself to learn RPN well enough to make a judgement. As an ex-land surveyor, math guy and programmer, I can tell you that it’s worth learning. It’s much more flexible than algebraic notation. ### 5/5 — This is a great app *2022-10-27* I used a real HP-67 when I was studying statistics at university. I still pwe a working one. This app is as close to the real thing ss it can get. Great work Fabian! ### 5/5 — A fabulous old beast *2022-06-20, version 1.7.0* Hewlett Packard were pioneers of the programmable calculator. They did it with a focus on sturdy reliability and practical functionality. The HP-67 was ahead of its time. It made good use of brand new technology of the day with its charming red LED display, and clever programming logic allowed recording of keypresses to automate repetitive tasks, all supplemented with bespoke program cards to further simplify things for the user. This superb emulation of one of HP's best, the legendary 67, comes with several of the most useful program cards, and replicates the original operation so accurately that watching the display during calculation imbues the thing with a life of its own and whisks me back to school in its memory. Unlike mere mortals though, it can always be trusted to come up with correct solutions. Considering the above, my disappointment that it does not rotate for landscape view on an iPad seems churlish. I almost always delete 'portrait only' apps but this wonderful thing really is a genuine exception. Legendary 67 is an outstanding app; a credit to its author and his perfectionism. ### 5/5 — Great calculator accessory *2022-03-20* For RPN fans, a must have on the IPhone. ❤️ it!! ### 5/5 — Really nice emulator *2021-01-05* The days when I would carry my HP-67 around are over, but with this and my phone I can use it again! Thanks for a wonderful app. ### 5/5 — Thanks for Hp 67 app! *2020-12-24* As an old engineer I loved this calculator. When mine died (the rubber mag strip drive wheel got gummy) I moved up to the Hp 48 which was cumbersome to program. I missed the simple keystroke programability of the 67 which I knew so well. It looks like I can resurrect my old 67 programs and run them again. I sincerely appreciate you writing this app and offering it for the free price. You are a true hero to the HP calculator legacy. I am very grateful to you. Thanks again.👍 ### 1/5 — Piece of crap *2020-12-19* Piece of crap. Doesn’t do landscape mode. ### 5/5 — A calculator for the HP style minds. *2020-07-03* A very well written program mimicking the real HP programmable calculator making it extremely useful for engineering types. I just love it. ### 5/5 — Great job! *2020-05-09* You made an old engineer very happy. The only thing I really miss is the great key feel. I loved my HP-67 dearly. ## Frequently asked questions about Legendary 67 ### What is Legendary 67? Legendary 67 is a free mobile application that emulates the functionality of the classic HP-67 programmable scientific calculator. It utilizes Reverse Polish Notation (RPN) for calculations and allows users to create and store their own programs. ### How does Legendary 67 handle programming? Programming in Legendary 67 is done by recording key presses, similar to using the original calculator. It supports features like loops, conditional execution, and subroutines, enabling the creation of complex programs up to 224 steps. ### Can I save and share my programs in Legendary 67? Yes, programs and register content are stored on virtual magnetic cards, which can be customized with labels and descriptions. These cards can be exported and imported, including via email, and can also be printed via AirPrint. ### Does Legendary 67 have ads? No, Legendary 67 is completely free and does not include any advertisements. It is designed to provide an uninterrupted user experience. ### What devices is Legendary 67 compatible with? Legendary 67 is supported on iPhone and iPod devices. It is rated for ages 4 and up. ### How often is Legendary 67 updated? The latest version is 1.7.0, last updated on July 25, 2019. Users can contact the developer via email for questions or to report bugs. ### What is the user sentiment for Legendary 67? Legendary 67 has a high rating of 4.6 stars from 23 ratings, indicating positive user sentiment. Users appreciate its emulation of the classic calculator and its programming capabilities. ### Are there any costs associated with Legendary 67? No, Legendary 67 is a free application. There are no in-app purchases or subscription fees required to use its full functionality. ## Version history (last 5 releases) ### 1.7.0 — 2019-07-25 + While entering a number [h] [DEL] will act as 'backspace', removing the last digit/point. - Fixes serious bug in the comparison functions. - Fixes broken images in the manual. - Fixes crashes while using mean and standard deviation and causing a devision by zero. - Fixes examples in the manual. - Restructures manual and updates external links. - Fixes program printing formatting issues. - Clarifies 'Annuities and compound amounts' program card explanation. - Improves program card visuals. - Makes visual improvements in various other locations. ### 1.6.7 — 2019-03-26 - Fixed a bug that caused numbers to small for FIX notation show incorrectly in FIX, SCI and ENG ### 1.6.6 — 2019-03-18 - The calculator does not prevent other audio from playing anymore. ### 1.6.5 — 2019-01-03 - Fixed a bug that prevented the forced switch to SCI mode, when a number could not be displayed in FIX mode. - Fixed incorrect stack update when '.' was used directly after ENTER. - Added privacy policy to the manual. ### 1.6.4 — 2018-05-22 - Fixed rounding related issues. - Fixed certain visual glitches on iPhone X. ## Apps similar to Legendary 67 | App | Rating | Price | Category | | --- | --- | --- | --- | | [Free42](https://appshunter.io/ios/app/free42/id337692629) | 4.8 (278) | Free | Utilities | | [HP15C: Scientific Calculator](https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693) | 2.7 (3) | $4.99 | Utilities | | [RPN-25 CE](https://appshunter.io/ios/app/rpn-25-ce/id1529311398) | 4.6 (9) | $2.99 | Utilities | | [HP41CV](https://appshunter.io/ios/app/hp41cv/id1214637000) | 2.7 (21) | Free | Utilities | | [RLM-11CX](https://appshunter.io/ios/app/rlm-11cx/id1630739014) | 3.1 (7) | Free | Utilities | | [Plus42](https://appshunter.io/ios/app/plus42/id1597963622) | 4.9 (76) | $9.99 | 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.*