# No Equal RPN Calculator > RPN scientific calculator with visible stack and quadratic equation solver. (iPhone/iPad app by Stan Corbin.) - Source: https://appshunter.io/ios/app/no-equal-rpn-calculator/id1440529798 (this page in markdown: same URL + `.md`) - Developer: [Stan Corbin](https://appshunter.io/developer/1440529797) - Category: Utilities, Productivity - Price: Free - Rating: 4.90/5 from 7 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 11 MB - Languages: American English - Released: 2019-05-28 - Data updated: 2026-06-01 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/no-equal-rpn-calculator/id1440529798/reviews.md ## What is No Equal RPN Calculator? This scientific calculator uses Reverse Polish Notation (RPN), similar to most HP calculators produced since 1972. RPN is more efficient for complex calculations. Unlike many RPN calculators, the No Equal calculator always shows the stack. This allows you to see both numbers before performing an operation, and it makes it easier to keep track of where you are in a complex calculation. The No Equal calculator has 10 memory registers. It also has a special function for solving quadratic equations (see the built-in help for details). This is the initial release of the No Equal calculator. Additional features will be coming soon. ## Key features - Reverse Polish Notation (RPN) - Always visible stack - 10 memory registers - Quadratic equation solver - HP calculator style ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/no-equal-rpn-calculator/id1440529798/reviews.md ### 5/5 — Nice app *2022-11-25* Thanks for the app! Hope a dark theme will be coming one day ### 3/5 — Educational *2022-05-24* With the stack permanently on display, its behaviour is easy to understand, making this one of the best calculators for anyone wishing to learn the powerful logic of RPN: more efficient and more logical than virtually all algebraic systems as well as providing immediate access to recent results. Even so, extra memories can be useful - and this has another 10 which work intuitively. But… This app does not make best use of the screen, particularly with an iPad in landscape view. The keypad is small and requires care to ensure each keypress is registered making operation rather clunky, especially when trying to access the extra orange and blue functions. If the keypad was larger, perhaps the most commonly used functions could have their own keys, thus reducing the number of keypresses to call them? The advertising banner is distracting, despite being smaller than some in other apps. Such distraction may not be much of a problem with games and other trivia, but is very unwelcome in a calculator. Overall, this is a good app with which to learn the considerable advantages of RPN - but for those already familiar, exploring the App Store for others could be very rewarding… ### 4/5 — Nice works ok *2021-05-16, version 1.0.3* Nice simple rpn calculator with just a few a knowing items 1) the adds are sometimes very miss leading I would stay away from using them. Two) after pressing enter the x reg retains its previous value rather then setting to 0 - small item but when your working the stack it’s a big confusion factor ### 5/5 — Ugly but gets the job done *2019-11-04, version 1.0.3* The operators and functions are there, and it doesn’t make mistakes. But it is ugly. Time spent with any HP calculator would provide design cues that would be welcome. I like it. But I don’t show it off to my friends. ## Frequently asked questions about No Equal RPN Calculator ### What is Reverse Polish Notation (RPN) on No Equal RPN Calculator? RPN is a calculation method where operators follow operands, unlike standard algebraic notation. No Equal RPN Calculator uses this method, similar to HP calculators, for potentially more efficient complex calculations. ### Does No Equal RPN Calculator have ads? Yes, No Equal RPN Calculator contains advertisements. It is a free application supported by ads. ### What devices does No Equal RPN Calculator support? No Equal RPN Calculator is available for iPhone, iPad, and iPod touch devices. ### How often is No Equal RPN Calculator updated? The latest version, 1.0.3, was released on June 22, 2019. The initial release was on May 28, 2019, indicating updates may not be very frequent. ### What is the age rating for No Equal RPN Calculator? No Equal RPN Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Can No Equal RPN Calculator solve quadratic equations? Yes, No Equal RPN Calculator includes a special function for solving quadratic equations. Details on how to use this feature can be found in the app's built-in help section. ### What makes No Equal RPN Calculator different from other RPN calculators? A key difference is that No Equal RPN Calculator always shows the stack, allowing users to see both numbers before an operation and better track complex calculations. ### What is the user sentiment for No Equal RPN Calculator? Based on the available data, the app has a high rating of 4.9 stars from 7 ratings, suggesting positive user sentiment. ## Version history (last 2 releases) ### 1.0.3 — 2019-06-22 Just some minor fixes and support for some earlier versions of iOS. ### 1.0.2 — 2019-05-28 No release notes. ## Apps similar to No Equal RPN Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [HP-35](https://appshunter.io/ios/app/hp-35/id6738010641) | 5.0 (5) | Free | Utilities | | [RePNCalc - RPN Calculator Pro](https://appshunter.io/ios/app/repncalc-rpn-calculator-pro/id969780852) | 5.0 (1) | Free | Utilities | | [bcRPN](https://appshunter.io/ios/app/bcrpn/id1614744829) | 4.8 (4) | Free | Utilities | | [Dozecal](https://appshunter.io/ios/app/dozecal/id1521160089) | 4.0 (4) | Free | Utilities | | [RLM-10CX](https://appshunter.io/ios/app/rlm-10cx/id6466089794) | 5.0 (1) | Free | Utilities | | [Halcyon Calc Lite](https://appshunter.io/ios/app/halcyon-calc-lite/id408004888) | 4.7 (15) | Free | Utilities | ## Related topics [no equal rpn calculator](https://appshunter.io/ios/topics/no-equal-rpn-calculator) · [stack rpn calculator](https://appshunter.io/ios/topics/stack-rpn-calculator) · [rpn calculator](https://appshunter.io/ios/topics/rpn-calculator) --- *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 2026-06-01.*