Comparison

RPN vs Calculator Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RPN

Features
Read full description

The basic four function calculator displays numbers in fixed format. The scientific calculator has 75 built-in functions covering logarithms, powers, roots, trigonometric, date, time, memory operations, statistics, and probabilities and up to four user defined macro functions. It displays numbers in user configurable fixed, scientific, or engineering formats. The user configurable calculator has sixteen user configurable function buttons that can each be assigned two functions from 75 built-in functions and access an unlimited number of user defined macro functions. It displays numbers in user configurable fixed, scientific, or engineering formats. The programmer’s calculator has a hexadecimal keypad and displays numbers in user configurable hexadecimal format. It has four basic mathematics, six bitwise, and two shift functions. All calculators share an operation history display for ease of reviewing computations and extensive in-app help documentation. Numbers can be copied to and pasted from the clipboard for ease of use with other applications.

About

Calculator Pro

This comprehensive toolkit offers standard and scientific calculations, currency and unit conversions, and financial planning tools. It features a clean interface with multi-language support and customizable options for everyday math needs.

Highlights
  • Standard and scientific calculator modes
  • Real-time currency conversion
  • Extensive unit converter
  • Mortgage and finance estimators
  • Calculation history and widget
  • Multi-language support
  • Dark Mode
Features
Read full description

Calculator Pro brings a scientific calculator, a currency converter, a unit converter, and number-base conversion together in one place. Compare exchange rates on a single screen, convert units and number bases, calculate percentages and discounts, and revisit recent calculations with a Home Screen widget. Depending on your region and language, you can also access useful tools for dates, mortgages, savings estimates, and more. CURRENCY CONVERTER Keep your frequently used currencies together in an editable list. Compare travel money and prices across currencies at a glance. Exchange rates may be delayed and are for reference only. UNIT CONVERTER Enter a value once and compare supported units across length, mass, temperature, time, area, volume, speed, engineering, electricity, and digital storage. EVERYDAY CALCULATORS Use base conversion, BMI estimation, random numbers, percentages, discounts, and other practical tools. SCIENTIFIC CALCULATOR Perform everyday arithmetic and scientific calculations, including trigonometric functions, logarithms, exponents, roots, and factorials. Switch between degree and radian modes. CALCULATION HISTORY AND WIDGET Review previous calculations and continue from an earlier result. Use the Home Screen widget to access recent calculations. Exchange rates and financial estimates are for informational purposes only. BMI is an estimate, not a medical assessment. These tools do not constitute investment, medical, tax, or legal advice. Verify important decisions with appropriate official or professional sources. Terms of Use: https://iorangepie.com/supercalculator/terms.html Privacy Policy: https://iorangepie.com/supercalculator/privacy.html

Screenshots

RPN4 screens
Calculator Pro4 screens

Verdict

The call

The clearest difference is price: Calculator Pro at Free against RPN's $4.99. Calculator Pro also leads on update cadence (every 10 days vs every 7 months). RPN's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Calculator Pro is free to download; RPN costs $4.99 up front. Calculator Pro sells 1 one-off in-app purchase. RPN asks for nothing beyond the download.

UpkeepUpdate frequency

RPN ships an update every 7 months, Calculator Pro every 10 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 5 level
RPN versus Calculator Pro: the parameters behind the verdict, then further details
ParameterRPNCalculator Pro
Price$4.99Free — better
Positive reviews—100.0% of reviews
Update frequencyEvery 7 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.6 — better17.6
Further details — not scored
Size1 MB7 MB
Age rating4+4+
DeveloperSteven DaviesLOVE ORANGE TECHNOLOGY CO.,LTD

In-app purchases

None

RPN

No in-app purchases

1 purchases

Calculator Pro

One-time1
  • Lifetime Pro$4.99

Questions

Is RPN free?
RPN costs $4.99, with no in-app purchases.
Is Calculator Pro free?
Calculator Pro is free to download, with in-app purchases available.
Do RPN or Calculator Pro have ads?
Neither RPN nor Calculator Pro shows ads.
Which is updated more often, RPN or Calculator Pro?
RPN ships an update every 7 months, and Calculator Pro every 10 days. Most recently, RPN was updated on November 3, 2026 and Calculator Pro on October 31, 2026.

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