InterCalc vs In Folio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InterCalc
This app performs linear interpolation using a set of X-Y values to define a relationship. It can calculate values based on defined points, useful for tasks like converting pressure readings to fluid volumes in containers or performing simple unit conversions.
- Linear interpolation of X-Y values
- Defines arbitrary functions from data points
- Calculates fluid volume from pressure readings
- Performs unit conversions (e.g., temperature, speed)
- Supports custom data sets
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This application is designed to linearly interpolate a value given a set of X-Y values that define a relationship. The X-Y values can be as simple as two points that specify a simple line, or they can be a set of points that specifies an arbitrary function. One use of this program is to calculate the amount of fluid in a container given a pressure reading at the bottom of the tank. Typically this situation results in several pressure readings and corresponding volume ( gallons, liters ) readings as the tank is being filled. Once the pressure measuring device is so calibrated, pressure readings can then be converted to gallon or liter values. Other uses include simple conversions between Fahrenheit and Celsius, or between kph and mph.
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.
- 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
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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
Verdict
The clearest difference is price: InterCalc at Free against In Folio's $1.49. InterCalc also leads on rating (5.0 vs 1.0). In Folio's advantage is update cadence (every 2 weeks vs every 11 months) and iOS requirement (13.0 vs 18.6). On ratings volume, 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
InterCalc is free to download; In Folio costs $1.49 up front. Neither carries in-app purchases, so what you see is what you pay.
InterCalc holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
InterCalc ships an update every 11 months, In Folio every 2 weeks. The most recent releases landed on June 25, 2026 and September 15, 2026 respectively.
| Parameter | InterCalc | In Folio |
|---|---|---|
| Price | Free — better | $1.49 |
| Rating | 5.0 (1 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 11 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | River Rock Logic | Alphanums |
Customer experience
InterCalc
In Folio
In-app purchases
InterCalc
No in-app purchases
In Folio
No in-app purchases









