# RPNscfi — Financial&Statistics RPN Calc.

> RPN calculator with financial, statistical, and scientific functions. (iPhone/iPad app by Neopoise.)

- Source: https://appshunter.io/ios/app/rpnscfi/id563901525 (this page in markdown: same URL + `.md`)
- Developer: [Neopoise](https://appshunter.io/developer/563901528)
- Category: Finance, Productivity
- Price: Free (on sale, was $2.99)
- Rating: 3.50/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 4 MB
- Languages: American English
- Released: 2012-09-28
- Data updated: 2026-06-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rpnscfi/id563901525/reviews.md

## What is RPNscfi?

RPNscfi is a 15-digit RPN calculator with unlimited stack depth. It supports numbers with magnitudes greater than or equal to 2^{-1022} (approximately 10^{-308}) and less than 2^{1024} (approximately 10^{308}).

With ease of use and beauty in mind, RPNscfi is designed for every family member (parents and students) and for professionals (in finance, engineering, and science). It combines a comprehensive set of household financial calculations (loans, mortgages, "what-if" analyses), statistical calculations, and scientific/engineering functions into a single package.

■ Tap “OPTIONS” and then the [Help] key to view the User’s Manual.
• Jump to Section 1.3 for a quick tour, then continue reading Section 1.4.
• If you are not familiar with an RPN calculator, please refer to Section 2.6.

■ VoiceOver-enabled universal app
• Supports macOS as a “Designed for iPad” iOS application

■ Financial Calculator
• Mortgage and loan calculations
• Amortization schedule (copy or e-mail in CSV or text formats; select and paste)
• Savings plan and pension fund calculations
• Savings account, appreciation, and depreciation calculations
• Lease calculations with/without residual value
• Interest rate conversions (e.g., dividend to annual interest rate and vice versa)
• Calendar functions with dynamically localized date output
• Helps you understand and manage your budget with “what-if” analyses

■ Statistics Calculator
• Mean (μ), population (σ) and sample (s) standard deviations, weighted mean (μ.w)
• Normal, log-normal, and log-log least-squares regression analyses (tested with a million data samples)
• Equation output, x and y estimators, r: Pearson product-moment correlation coefficient
• Powerful editing feature: edit any record; export/import your data between iOS devices and desktop computers
• Test generator to get acquainted with the statistics calculator
• Regression graph feature: guides you to visually navigate your datasets

■ Scientific Calculator
• Common trigonometric, hyperbolic, logarithmic, and exponentiation functions (bases e, 10, and 2)
• Arbitrary rounding, mod operation, various ceil and floor functions, percentage functions
• Factorial function, binomial coefficient, and greatest common divisor calculations

■ Unit System Conversion Calculator
• Simple yet useful for addressing daily metric to/from imperial conversion needs.
• 5 length, 5 area, 2 weight, 2 volume, and temperature, plus a little more cross-unit conversions.

■ Built-in PDF User’s Manual
• E-mail or print the User’s Manual
• All financial features are explained and demonstrated with annotated examples

■ Additional Features
• Easy-to-review, on-demand, non-intrusive tape
• Built-in tape history browser and editor
• Gives you a true record of all calculations
• Includes copy, selective copy, and e-mail functions

■ Easy configuration via gestures
• US and EU number formats
• 5 number notations: DEC, FIN, ENG, SCI, UNF
• 2 trigonometric angle modes: DEG, RAD
• Fixed-point (FIN) and fixed-digit (ENG) number notations
• 4 keypad themes, 3 keypad fonts, 3 display fonts, 3 tape fonts, and 4 display and tape font colors

## Key features

- Unlimited stack depth RPN calculator
- Financial calculations (loans, mortgages)
- Statistical analysis (regression, correlation)
- Scientific and engineering functions
- Unit system conversion
- Built-in PDF User's Manual
- Tape history browser and editor

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/rpnscfi/id563901525/reviews.md

### 2/5 — Great RPN but major iOS14 issue

*2020-11-13*

Both versions (RPNscfi and ProgCalc) we working fine on iPhone and iPad until iOS 14. Now on iPad there is a white bar that goes across the bottom of the screen in both portrait and landscape mode and hides the lower row of buttons. Hopefully this can be addressed in the next version!

### 5/5 — Best rpn out there

*2013-03-08*

As stated in the title, best calculator app. It's extremely powerful yet even a novice can use it. All in all, I would highly recommend. The developer is very responsive and has addressed all of my questions. 

Tip:
There is a hidden help menu under options. Awesome feature but many may not notice it. 

Features that I really like:
As a professional, I'm required to do fast number crunching. Love the ability to whip open the app and punch away. 
Black theme with blue font looks very professional and easy on the eyes. 
Ability to set dec or eng or fin by simple up down swipes. Also, ability to set decimal places by simple left right swipe on display panel. 

Features I would love to see in the long run:
Ability to email directly from app in a beautiful format like Digits or Soulver. 

Bottom line: I would pay $5 for this. It's the scientific version of pcalc and does many things far better.

### 5/5 — AWESOME

*2013-01-22*

This is hands down the best calculator app ever.  Tons of features and customer support is amazing.  You can't go wrong. In fact, when I suggested that they add a delete key, they do so in a few days.  How's that for customer support?  Simply amazing.

## Frequently asked questions about RPNscfi

### What is RPNscfi?

RPNscfi is a 15-digit RPN calculator designed for financial, statistical, and scientific calculations. It features unlimited stack depth and supports a broad range of number magnitudes, making it suitable for complex computations.

### What financial calculations does RPNscfi offer?

RPNscfi provides comprehensive financial calculations including mortgage and loan computations, amortization schedules, savings plans, pension fund calculations, and lease analyses. It also aids in budget management with 'what-if' scenarios.

### Can RPNscfi perform statistical analysis?

Yes, RPNscfi includes a statistics calculator with functions for mean, standard deviations, weighted mean, and various regression analyses. It also offers a regression graph feature for visual data navigation and a test generator.

### What scientific functions are available in RPNscfi?

The scientific calculator in RPNscfi supports common trigonometric, hyperbolic, logarithmic, and exponentiation functions. It also includes operations like arbitrary rounding, mod, ceil, floor, percentage, factorial, binomial coefficient, and greatest common divisor.

### Does RPNscfi support unit conversions?

Yes, RPNscfi has a unit system conversion calculator for metric to imperial needs, covering length, area, weight, volume, and temperature conversions.

### How can I learn to use RPNscfi?

RPNscfi includes a built-in PDF User's Manual accessible via the 'OPTIONS' menu. Section 1.3 offers a quick tour, and Section 2.6 is available for those unfamiliar with RPN calculators.

### What devices is RPNscfi available on?

RPNscfi is a universal app that supports iPhone, iPad, and iPod. It is also designed for iPad and functions as an iOS application on macOS.

### Does RPNscfi have ads?

RPNscfi is free and does not contain advertisements, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 3.42 — 2025-11-05

The use of Mac up/down arrow keys has been replaced to avoid hidden compatibility issues with macOS, such as macOS-emulated mouse and trackpad movements.

Documentation Updates:
Section 9, titled “Keyboard Shortcuts for RPNscfi on Mac,” the table in subsection 9.2, and Figure 9.1 in subsection 9.3 have been updated.

### 3.41 — 2025-10-20

Bug Fixes:
1. When a .csv file is clicked in the iOS Files app or macOS Finder, RPNscfi launches but then crashes. This issue has been fixed, and the app now functions properly.
2. The macOS shortcut key ‘K’ did not dismiss the Stack View on its second use. Now it does.

Documentation Updates:
Section 9, titled ‘Keyboard shortcuts for RPNscfi on Mac,’ has been revised for clarity.

### 3.4 — 2025-10-13

Enhancement Release 3.4
This release introduces a new feature: RPNscfi is now compatible with macOS as an iPad app. For a detailed explanation of this update, refer to Section 9, titled “Keyboard shortcuts for RPNscfi on Mac,” in the app documentation.

Bug Fix:
The iPad in portrait mode with the extended keypad layout couldn’t switch the unit conversion key directions with [shift] key unless a right or left swipe gesture was applied to switch to the unit calculator mode.

Documentation Updates:
1. A new Section 9 has been added, titled “Keyboard shortcuts for RPNscfi on Mac.”
2. The two-column document layout has been changed to a single-column layout.

### 3.3 — 2025-10-01

Minor Enhancement:
+ iPad Keyboard Layout Enhancements:
   The iPad keyboard layout has been redesigned to fully utilize the tall Portrait orientation, particularly in split-screen and slide-over compact forms.

+ Unit Conversion Keypad Keys:
   The following unit conversion keypad keys have been added:
   - Teaspoon to milliliters [tsp|ml]
   - Tablespoon to milliliters [tbsp|ml]
   - Kilocalories to kilojoules [kCal|kJ]
   - Knots to kilometers per hour [knots|kmph]

+ Built-in Document View search results:
   PDFView retains search results with matched text highlights until the search is canceled (re: section 1.4).

+ Revised Document Sections:
   Document section 1.4, titled “Built-in Document View (PDFView) Tips,” has its title renamed and revised.
   Document section 6, titled “Unit Conversion Calculator,” has been revised.

### 3.20 — 2022-01-14

Minor enhancement:
+ [logΓx] key replaced with [lnΓx] key, returning natural logarithm of Γ(x).
+ A feature that allowed User's Manual view switching back and forth to calculator on device orientation has been removed.
+ [atan2] key is added to Financial calculator keypad. Press [f][atan2] without any entry to learn syntax.

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## More apps by Neopoise

- [ProgCalc](https://appshunter.io/ios/app/progcalc/id1441551265)

All apps by Neopoise: https://appshunter.io/developer/563901528

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*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 2026-06-04.*