Comparison

RPN Calc vs In Folio

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

Head to head
About

RPN Calc

This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.

Highlights
  • Reverse Polish Notation (RPN) input
  • Clean, simple interface
  • Large, easy-to-press buttons
  • iPhone, iPad, and Apple Watch support
  • Today Extension for quick access
Features
Read full description

A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch! If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier than your computer or calculator. And, remember those cool calculator watches from the 1980s? Unfortunately, none of them were RPN. RPN Calc brings a reverse polish notation watch calculator to the Apple Watch! In addition to the standard RPN Calculator app that runs on iPhone, iPad, and Apple Watch, RPN Calc includes a handy micro RPN Calc Today Extension available for convenient access to quick calculations from the pull down Today screen.

About

In Folio

This app helps you create professional-looking booklets from PDF files. It automates the process of arranging, folding, and stapling pages for a polished publication. Supports various folding formats like folio, quarto, and octavo.

Highlights
  • Create booklets from PDFs
  • Supports folio, quarto, six, octavo folds
  • Automated photocomposition
  • Adjustable paper and print formats
  • Preserves original document resolution
  • Available in 6 languages
Features
Read full description

Have you ever struggled at home or at the office to print a user manual such as a booklet, folded in 2 or 4 or more, and give your publication a professional look? In Folio assists you in the preparation and execution of your impressions, to create booklets assembled, folded, stapled like a real book. You can now create booklets or books: - folio, pages folded in 2 - in quarto, pages folded in 4 - in six, pages folded in 6 - in octavo, pages folded in 8. Whole pdf file preparation can be automated. In Folio works on Mac, allowing you to do everything directly on your Mac, without needing an iPhone or iPad. With photocomposition capability, the process is fully automated: - Copy the PDF file, in A4, A5, A6, or A7 format, ISO or US, into the 'In Folio' app documents. - On a Mac, you can copy the file by dragging and dropping its icon onto the “In Folio” icon - Select the print paper format (A4 or A3, ISO or US). - Request “PhotoComposer.” - Print the file without having to do anything other than check the double-sided mode and print orientation. Printing is performed without any loss of resolution from the original document. You can also print large documents (more than 16 pages) in Book mode: the layout is divided into sections, which are easier to fold. These sections are then assembled into a book that can be bound. A complete user manual is available on our website:https://alphanumsapps.com In Folio is available in 6 languages: English, French, German, Spanish, Italian, Greek. In Folio works on IOS 13 and higher on iPhone or iPad or macOS 14 or higher. Note: Even if your high-end printer handles layouts in quarto, in Six, 'In Folio' offers you unprecedented ease in creating any type of book or booklet, from in folio to in octavo.

Screenshots

RPN Calc3 screens
In Folio4 screens

Verdict

The call

The clearest difference is rating: RPN Calc at 4.0 against In Folio's 1.0. RPN Calc also leads on review sentiment (38% vs 0%) and monetization model (free vs paid). In Folio's advantage is update cadence (every 2 weeks vs every 3 months) and iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support 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

RPN Calc costs $0.99 and In Folio $1.49 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RPN Calc holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 6 and 2 respectively. Written reviews point the same way: 38% of RPN Calc's written reviews are positive against 0% of In Folio's.

UpkeepUpdate frequency

RPN Calc ships an update every 3 months, In Folio every 2 weeks. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.

Scorecard6 real differences · 4 level
RPN Calc versus In Folio: the parameters behind the verdict, then further details
ParameterRPN CalcIn Folio
Price$0.99 — better$1.49
Rating4.0 (6 ratings) — better1.0 (2 ratings)
Positive reviews37.9% of reviews — better0.0% of reviews
Number of ratings6 — better2
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.013.0 — better
Further details — not scored
Size3 MB15 MB
Age rating4+4+
DeveloperJames MattisAlphanums

Customer experience

RPN Calc

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews29 reviews
Positive37.9%
Neutral13.8%
Negative48.3%

In Folio

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

RPN Calc

No in-app purchases

None

In Folio

No in-app purchases

Questions

Is RPN Calc free?
RPN Calc costs $0.99, with no in-app purchases.
Is In Folio free?
In Folio costs $1.49, with no in-app purchases.
Which has better reviews, RPN Calc or In Folio?
RPN Calc is rated higher. RPN Calc averages 4.0 out of 5 from 6 ratings, while In Folio averages 1.0 from 2 ratings.
Do RPN Calc or In Folio have ads?
Neither RPN Calc nor In Folio shows ads.
Which is updated more often, RPN Calc or In Folio?
RPN Calc ships an update every 3 months, and In Folio every 2 weeks. Most recently, RPN Calc was updated on September 25, 2026 and In Folio on September 15, 2026.

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