CMCalc vs Big character calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CMCalc
This app emulates a classic 1980s computer math calculator, offering decimal arithmetic, binary conversions, and logic functions. It supports parentheses for complex calculations and includes modern features like copy/paste and landscape mode.
- Decimal arithmetic
- Binary conversions (decimal, binary, octal, hexadecimal)
- Binary logic functions
- Operator grouping with parentheses
- Hexadecimal input (A-F)
- Copy and paste results/functions
- Landscape mode
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The CMCalc application is a replica of the Casio CM-100 Computer Math Calc solar powered calculator that was sold in the mid 1980’s. It performs simple decimal arithmetic and basic binary conversions (decimal - binary - octal - hexadecimal) and binary logic functions. While it is a standard infix calculator, it supports operator grouping with parentheses. For hexadecimal calculations, the input keys include A through F. CMCalc application performs all the same functions as the calculator, and has the same look as the original. There are a couple features that were not conceivable in the 1980’s on a calculator … such as the ability to copy and paste the results or the entered function, and a landscape mode for devices with 4 inch or larger screens. The face of the calculator can be viewed in two modes including a traditional application style, and a photo replica of the original calculator face.
Big character calculator
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Calculator with large buttons and easy to use for anyone
Screenshots
Verdict
The clearest difference is ads: CMCalc at none against Big character calculator's shown. CMCalc also leads on iOS requirement (12.0 vs 15.8.3). Big character calculator's advantage is update cadence (every 11 days vs every 45 months). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CMCalc ships an update every 45 months, Big character calculator every 11 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | CMCalc | Big character calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (7 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 45 months | Every 11 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 15.8.3 |
| Further details — not scored | ||
| Size | 4 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | William David | Hideaki Uchikoshi |
In-app purchases
CMCalc
No in-app purchases
Big character calculator
No in-app purchases
Questions
Is CMCalc free?
Is Big character calculator free?
Do CMCalc or Big character calculator have ads?
Which is updated more often, CMCalc or Big character calculator?
Other comparisons
