Fomcal vs InstantMemo
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.
InstantMemo
This app is designed for quick note-taking, prioritizing speed and simplicity. It removes all non-essential features to ensure the fastest possible startup time for immediate jotting down of ideas.
- Maximum startup speed
- Eliminates extra functions
- Immediate note-taking
- Simple interface
Read full descriptionHide full description
"I opened the memo app but forgot what to write" It is an application for such people. We eliminated all extra functions and increased the startup speed to the maximum.
Screenshots
Verdict
The clearest difference is price: InstantMemo at Free against Fomcal's $1.99. InstantMemo also leads on in-app purchases (none vs 1) and review sentiment (100% vs 75%). 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
InstantMemo is free to download; Fomcal costs $1.99 up front. Fomcal sells 1 one-off in-app purchase. InstantMemo asks for nothing beyond the download.
Fomcal ships an update every 3 months, InstantMemo every 2 weeks. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.
| Parameter | Fomcal | InstantMemo |
|---|---|---|
| Price | $1.99 | Free — better |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | NOBORU IMAI | Shigeki Matsunaka |
Customer experience
Fomcal
InstantMemo
In-app purchases
Fomcal
- Enhancements$1.99
InstantMemo
No in-app purchases









