RPN Calculus vs PuchCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Calculus
This scientific calculator app for iPad offers a clean RPN interface with basic and advanced functions. It supports high precision calculations and provides an extensive, user-extendable database of scientific constants.
- RPN (Reverse Polish Notation) interface
- Basic and advanced mathematical functions
- High precision calculations (up to 15 digits)
- Extensive scientific constant database
- User-extendable constant database
- Memory space for values
Read full descriptionHide full description
RPN Calculus is a scientific RPN Calculator for the Apple iPad. RPN Calculus provides basic arithmetic operations as well as advanced mathematic operations like trigonometric, hyperbolic or logarithmic functions. The calculator app provides an unlimited, well, limited by system resources, amount of memory space for values. RPN Calculus performs calculations with a precision of up to 15 digits and supports a number range from -1E127 to 1E127. It's smallest presentable number is 1E-128. RPN Calculus offers a clean and simple layout, very common if you have used scientific RPN calculators before. RPN Calculus has a build in constant values database. The database contains over 120 scientific constants of different categories like e.g. Mathematics, Physics or Astronomy. Since the constants database is user extendable, you can add constant values that you are may be missing in the default set of constants. RPN Calculus can print out your values on the stack and the memory.
PuchCalc
Read full descriptionHide full description
<Fashionable function> You can choose the design from 13 themes. You can also change the shape and font of the buttons, expanding the range of designs. <Convenient for shopping> Just add them in the order of purchase, and the total amount will be displayed in the history. ・In parentheses are tax-included ・When automatic recalculation is on, the calculation history can be recalculated. Even if you add it by mistake, it will be automatically recalculated by deleting the wrong line. ・Consumption tax calculation is also displayed automatically. <Calculation history function> The calculation remains as a history and can be reconfirmed after the calculation. The calculation history can be shared externally, and can be sent to e-mail, Twitter, etc. Features) ・Fashionable function:You can choose the overall design, button shape and font. ・Calculation history function:The calculation remains as a calculation history. ・Calculation history sharing function:The calculation history can be sent to an external compatible app. ・Compatible with iPad ・Language support:It is displayed in the supported languages according to the set languages of Japanese, English, and iOS. *Advertisement will be displayed. *Advertisement non-display PuchCalc Pro is also available, please use it.
Screenshots
Verdict
The clearest difference is price: PuchCalc at Free against RPN Calculus's $1.99. PuchCalc also leads on update cadence (monthly vs every 4 months) and device support (3 vs 1). RPN Calculus's advantage is ads (none vs shown) and iOS requirement (12.0 vs 14.1). On in-app purchases 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
PuchCalc is free to download; RPN Calculus costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPN Calculus ships an update every 4 months, PuchCalc monthly. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.
| Parameter | RPN Calculus | PuchCalc |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 11 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Braun | Jutaro Kimura |
In-app purchases
RPN Calculus
No in-app purchases
PuchCalc
No in-app purchases







