# RLM-11CX — Scientific & Programable > Scientific and programmable calculator app based on the HP-11C. (iPhone/iPad app by Ricardo Lira Matte.) - Source: https://appshunter.io/ios/app/rlm-11cx/id1630739014 (this page in markdown: same URL + `.md`) - Developer: [Ricardo Lira Matte](https://appshunter.io/developer/289639238) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 3.14/5 from 7 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 6 MB - Languages: English - Released: 2022-06-28 - Data updated: 2026-06-07 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews.md ## What is RLM? The RLM-11C+ application is a general purpose calculator with a special focus science and engineering. It is based in the Hewlett-Packard HP-11C calculator, but specially designed to bring up the most of your iOS devices and , at the same time, conserving the easy of use and all functions originally provided by the real calculator. >Finance Menu: •Account Balance: Credit line type account based on cash transactions and interest rates applied. •Amortization: Loan Amortization Schedule for a single loan payment or from several payments at once. •Bond Price & Yield: Bonds calculations in an easy way with all options and values at sight. •Black-Scholes Options: CALL, PUT and “Greeks” calculations of the Black-Scholes European option valuation model. •Equal Periods: Calculations with Cash Flows occurring at regular time intervals. •Unequal Periods: Calculations with Cash Flows occurring at arbitrary dates. •Depreciation: Calculates depreciation with SL, SOYD, DB or MACRS methods and conventions. values at sight. •Interest Conversion: Nominal and effective interest conversion. •Time Value of Money: Compound Interest problems involving money earning interest over a period of time. >Business Menu: •Bill-Tip-Split: Calculates the sharing of a Bill with Tip. •Break-Even: Analyze the following relation: Profit = (Price - Var.Cost) • Units - Fix.Cost •Currency Exchange with on-line rates. •Percents & Margins: Calculates %Change, %Total and Business margins. Date / Time Menu: Calculates Date and Time intervals with all values at sight. >Statistics Menu: •One-Variable Statistics: Calculations for one variable data samples. •Two-Variable Statistics: Calculations for two variables data samples. •Curve Fitting: 6 Regression models to fit a curve based on two variables data samples. •Probability: Combinations, permutations, Normal, Exponential, t-Student and Weibull probability distributions. >Scientific Menu: •Complex Numbers: Operations and functions with complex numbers. •Logarithms, Trigonometric, Hyperbolic and Number Alteration functions. •Triangle Solution: Solves a Plane & Spherical triangles. •3D Vectors: Operations and functions with vectors in Cartesian, Spherical or Cylindrical coordinates. •Universal Constants: All the NIST-CODATA physical constants values and descriptions. •Units Conversion: Physical units conversion completely customizable. >Convert Menu: •Angles & Polar: Convert angles between DEG,RAD,GRAD,DMS or Slope % & Polar-Rectangular coordinates. •Currencies: world currencies conversions with manual input or on-line current rates. •Interest Rates: Nominal and effective interest conversion. •Units: Physical units conversions. >Program Menu: Create, edit or load previously saved programs. >Solver Menu: Solve arbitrary algebraic equations entered and saved in the equation editor and creates a menu with all the variables to solve any of them. >Utilities Menu: •General Settings: Customize the calculator to your preference. •Storage Registers: Store and perform operations directly over the calculator’s storage registers. •Memory Content: Shows all memory content edit, backup or restore. •Help Documents: learn by example about all menus. >Editors: submenu to select data editors. System requirements: iOS 15.0 or above. 30 days Free-Trial. In-App-Purchase: One-Payment for life. License Agreement: http://www.apple.com/legal/itunes/appstore/dev/stdeula Disclaimer: THIS IS NOT A HEWLETT PACKARD CALCULATOR, AND IS NOT SPONSORED IN ANYWAY BY HEWLETT PACKARD OR ANY OF ITS SUBSIDIARIES. ## Key features - Finance calculations (amortization, bond price, Black-Scholes) - Business functions (break-even, currency exchange) - Statistical analysis (regression, probability distributions) - Scientific functions (complex numbers, logarithms, trigonometry) - Unit and currency conversions - Programmable interface for custom scripts - Equation solver ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly Subscription | $0.49 | per month | | Semi-Annual Subscription | $2.99 | per 6 months | | Annual Subscription | $5.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Lifetime Purchase | $9.99 | one-time | ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews.md ### 1/5 — Life time purchase is not true *2024-04-12* I purchased this program a year ago my phone just died I purchased new phone install the app on new phone now they are demanding $9.99 payment…..it is not a life time payment **Developer response:** Please install the app from the AppStore's Purchase History. There you will find the original RLM-11C that you may purchase at that time. We say that because we have to create a new app with the same name in order to offer a 30 days free trial without any commitment, which is the RLM-11CX version 2.1.4 Other causes should be target to Apple customer service because all the sales, payments and installation processes are completely controlled by them. We can't do anything about. ### 5/5 — A classic! *2023-03-14* I’ve been using an HP-11C for 30 years, and RLM’s HP-11C simulators for dozens of years. I’m very happy to see it available for iOS. Keep up the good work! **Developer response:** Thank you very much for your rating. It encourage us to build top quality and usable calculators for iOS. ### 5/5 — I use it every day *2023-02-08* I have been using this version and an earlier version of this HP-11C emulator from R.L.M. for years now. It’s even better than the original calculator, which I happen to have ## Frequently asked questions about RLM ### What is RLM-11CX? RLM-11CX is a general-purpose calculator app for iOS devices, specifically designed for science and engineering. It emulates the functionality of the Hewlett-Packard HP-11C calculator while leveraging the capabilities of modern iOS devices. ### Does RLM-11CX have ads? No, RLM-11CX does not contain advertisements. The app is free to download and use, with optional in-app purchases for subscription plans. ### What are the subscription options for RLM-11CX? RLM-11CX offers several subscription plans: a monthly subscription for $0.49, a semi-annual subscription for $2.99, and an annual subscription for $5.99. These plans provide access to premium features or extended functionality. ### What kind of finance features does RLM-11CX offer? RLM-11CX includes a comprehensive Finance Menu with features such as Account Balance, Loan Amortization, Bond Price & Yield calculations, Black-Scholes Options analysis, and Time Value of Money calculations. ### Can RLM-11CX solve equations? Yes, RLM-11CX features a Solver Menu that allows you to solve arbitrary algebraic equations. You can enter and save equations, and the app will create a menu to solve for any of the variables. ### What scientific functions are available in RLM-11CX? The Scientific Menu in RLM-11CX supports operations with complex numbers, logarithmic, trigonometric, and hyperbolic functions, triangle solutions, 3D vector operations, and access to universal physical constants. ### How often is RLM-11CX updated? RLM-11CX was last updated on April 26, 2024, with version 2.1.4. This indicates a relatively active development cycle, with updates addressing functionality and compatibility. ### What devices is RLM-11CX compatible with? RLM-11CX is designed for iOS devices, including iPhone, iPad, and iPod. It is rated for ages 4 and up, making it suitable for a wide range of users. ## Version history (last 5 releases) ### 2.1.4 — 2024-04-26 Now you can listen music while using the calculator. ### 2.1.3 — 2024-04-04 New editor for the Unit Conversion Database. Fix a problem with some devices involving the edition of a units conversions and categories in the database. ### 2.1.2 — 2024-03-07 Fix a bug regarding Accessibility Setting that affect the look of the interface. Now is always drawn well. ### 2.1.1 — 2024-02-18 Fix the issue of Currency Exchange menu where the "Get Rate" stop working since February 16th, 2024. ### 2.1 — 2023-09-06 - Lots of refinements in all menu views. - Small layout bugs in iPad fixed. - Improvements in performance and stability. ## Apps similar to RLM | App | Rating | Price | Category | | --- | --- | --- | --- | | [HP 15c Calculator](https://appshunter.io/ios/app/hp-15c-calculator/id503720774) | 4.8 (168) | $14.99 | Utilities | | [Plus42](https://appshunter.io/ios/app/plus42/id1597963622) | 4.9 (76) | $9.99 | Utilities | | [HP15C: Scientific Calculator](https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693) | 2.7 (3) | $4.99 | Utilities | | [HP41CV](https://appshunter.io/ios/app/hp41cv/id1214637000) | 2.7 (21) | Free | Utilities | | [Free42](https://appshunter.io/ios/app/free42/id337692629) | 4.8 (278) | Free | Utilities | | [RPN-25 CE](https://appshunter.io/ios/app/rpn-25-ce/id1529311398) | 4.6 (9) | $2.99 | Utilities | ## More apps by Ricardo Lira Matte - [RLM-10BX](https://appshunter.io/ios/app/rlm-10bx/id1563019331) - [RLM-17BX](https://appshunter.io/ios/app/rlm-17bx/id1593889938) - [RLM-19BX](https://appshunter.io/ios/app/rlm-19bx/id1597086394) - [RLM-12CX](https://appshunter.io/ios/app/rlm-12cx/id1613759385) - [RLM-12PX](https://appshunter.io/ios/app/rlm-12px/id1613770734) All apps by Ricardo Lira Matte: https://appshunter.io/developer/289639238 ## Related topics [hp 11c](https://appshunter.io/ios/topics/hp-11c) · [i48](https://appshunter.io/ios/topics/i48) --- *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 2026-06-07.*