Fomcal vs RCS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fomcal
This app allows you to create and save custom calculation formulas for daily use. It supports complex functions, logical operations, and parameter studies, with options to export results as CSV. An optional numeric pad enhances input efficiency.
- Save and reuse custom formulas
- Support for logical and comparison functions
- Parameter study for variable analysis
- Export results as CSV
- Optional enhanced numeric pad
- Extended syntax for branching and iteration
Read full descriptionHide full description
Fomcal is a calculator to calculate quickly with formula inputted already. Since you can register formulas used in daily routine by yourself, there is no need to search or to develop the dedicated calc app. Moreover, Fomcal can be also available as a general function calculator pad (option). Registered formula can be utilized as a function in the other formula or on the calcpad. And constants or variables can be used in these. Fomcal can show descriptions and a figure, about formulas and variables. In addition to the numeric functions such as trigonometric functions, you can also use the logical or comparison functions. By describing separated multiple of a formula with a semicolon';', you will be able to calculate these at the same time. Temporary variables are available in formula definition as followings. exp) x=1;x+2 result) 3 You can try a parameter study with specifying an initial value, a incrementation and a repeat number. The result can be exported as CSV data. Following formulas are preset as samples. ・Hypotenuse of Right Triangle - Geometry ・Cross-sectional Performance of Rectangle - Mechanics of materials ・Roots of quadratic equation - Mathematics ・Compound interest calculation - Business ・Number of years to become N times with compound interest calculation After purchase of "Enhancements (former Restriction Release)" with In-App purchase, you will be able to following functions. ・Export/import of formula data. ・A special numeric pad will be utilized for efficient inputting. ・Function calculator pad. ・Parameter study. From Ver.3.3, "Extended Syntax" feature is available. With $IF, $FOR, $WHILE or etc., branch or iterative operation is easily specified.
RCS
Read full descriptionHide full description
Analyse and design reinforced concrete sections on your iPhone. RCS brings geometry, material properties, load cases and calculation results into one workflow, with professional PDF reports. DEFINE YOUR CROSS SECTION Choose from solid and hollow circular, rectangular, oblong and other standard sections. Build beam and wall sections, or define custom contours, openings and reinforcement. Use bar catalogues or custom diameters, with count and spacing modes where available. SET MATERIALS AND THE DESIGN CODE Define the concrete and steel properties, and select from the supported editions of ACI 318, AASHTO LRFD, CSA A23.3, CSA S6, AS 3600 and NZS 3101. Review material behaviour and adjust the advanced parameters for the selected profile. US and SI units are available. ADD YOUR LOAD CASES Enter axial forces and bending moments manually, import them from a file or paste a table of values. CALCULATE SECTION PROPERTIES Obtain areas, centroids, bending inertias and principal axes. Use finite element calculations for torsional properties, shear areas and the shear centre, and inspect shear stress distributions. CHECK RESISTANCE IN BIAXIAL BENDING Section check combines a 3D interaction surface, 2D curves and load checks in one page. Compare design and nominal resistance. Review resistant moments at each load's axial force, demand-to-resistance ratios and characteristic limit states. Identify the load cases the section can resist and those for which its resistance is insufficient. DESIGN THE REINFORCEMENT Determine the minimum steel area for the selected load cases. Review the resulting resistance surface, then recalculate a catalogue bar proposal selected from the design standard for the defined arrangement. CREATE PROFESSIONAL REPORTS Combine geometry, materials, loads and selected analysis results in a PDF report. Include project and engineer details, then save or share the report using your preferred app. LEARN THROUGH A GUIDED EXAMPLE Follow a circular-section example through section properties, section checks, reinforcement design and the final report. Contextual help explains each page and its results. LOCAL CALCULATIONS. NO ACCOUNT. Calculations run on your device. Save and load your project inputs locally, and choose when to share your reports. No RCS account is required. BUY ONCE, KEEP IT FOREVER Full access is a one-time purchase: no subscription, no recurring billing and no account. Updates are included. The App Store displays the price for your region before confirmation. Try RCS first with a free trial of 7 days or 20 analyses, whichever comes first, with no automatic charge. Restore purchases from Settings using the same Apple Account. RCS calculates cross-section resistance and properties. It does not perform a complete structural or member design. Review the selected code edition, material assumptions and input data for your project. Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: RCS at Free against Fomcal's $1.99. RCS also leads on update cadence (every 2 days vs every 3 months). Fomcal's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On ads and 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
RCS is free to download; Fomcal costs $1.99 up front. Fomcal sells 1 one-off in-app purchase and RCS sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Fomcal ships an update every 3 months, RCS every 2 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.
| Parameter | Fomcal | RCS |
|---|---|---|
| Price | $1.99 | Free — better |
| Positive reviews | 75.0% of reviews | — |
| Update frequency | Every 3 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 6 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | NOBORU IMAI | Nabil El Berria |
In-app purchases
Fomcal
- Enhancements$1.99
RCS
- RCS Weekly7 Days trial$4.997 Days
- RCS Yearly7 Days trial$49.991 Year
- 7-day TrialFree
- Full Access$24.99









