Comparison

CMCalc vs OpenCCman Open Chinese Convert

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

OpenCCman Open Chinese Convert

Features
Read full description

Convert Chinese text on iPhone and iPad, and add script conversion to your own Shortcuts workflows. OpenCCman brings local text conversion, TXT files and a native source/result workspace together. Choose Simplified Chinese, OpenCC Traditional, Taiwan Standard with Taiwan idioms, or Hong Kong Traditional. Advanced character-variant and regional wording options remain available. Simplified output is not a complete reverse conversion of Taiwan-specific vocabulary. Start with a blank draft, paste your text, or fill in an example when you need one. Compare source and result side by side or stacked on iPad. The compact iPhone Convert button leaves more room for reading. Clear Source asks before removing the current source and result. On iOS and iPadOS 16 or later, the free Convert Chinese Text action accepts text and one of four presets, then returns the result to the next Shortcuts action. Connect it to clipboard or file actions without changing an open draft. It does not use the homepage daily allowance; text input is limited to 10 MiB in UTF-8. Import or drop one UTF-8 TXT file up to 10 MiB, including files with a BOM. Copy or share the result, or export the latest successful conversion as UTF-8 TXT without a BOM. Line endings, blank lines and Unicode text are preserved. Save Big5 or GBK files as UTF-8 first. Batch files and files over 10 MiB are not supported on iPhone or iPad, including with Pro. Free users can complete 12 successful homepage conversions per day. Importing, exporting and changing presets do not count. Lifetime Pro is a one-time purchase that removes the homepage limit and in-app recommendations. View purchase status or restore purchases in Settings. Powered by OpenCC, text conversion runs locally on your device. OpenCCman requires iOS or iPadOS 15 or later. Open source under the MIT license: https://github.com/gewill/OpenCCman

Screenshots

CMCalc4 screens
OpenCCman Open Chinese Convert4 screens

Verdict

The call

The clearest difference is in-app purchases: CMCalc at none against OpenCCman Open Chinese Convert's 1. CMCalc also leads on iOS requirement (12.0 vs 15.0). OpenCCman Open Chinese Convert's advantage is update cadence (every 3 months vs every 45 months) and device support (4 vs 2). On price and ads 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

Both are free to download. OpenCCman Open Chinese Convert sells 1 one-off in-app purchase. CMCalc asks for nothing beyond the download.

UpkeepUpdate frequency

CMCalc ships an update every 45 months, OpenCCman Open Chinese Convert every 3 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
CMCalc versus OpenCCman Open Chinese Convert: the parameters behind the verdict, then further details
ParameterCMCalcOpenCCman Open Chinese Convert
PriceFreeFree
Rating4.6 (7 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings7 — better—
Update frequencyEvery 45 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.0 — better15.0
Further details — not scored
Size4 MB21 MB
Age rating4+4+
DeveloperWilliam David伟 葛

In-app purchases

None

CMCalc

No in-app purchases

1 purchases

OpenCCman Open Chinese Convert

One-time1
  • Lifetime Pro$2.99

Questions

Is CMCalc free?
CMCalc is free to download, with no in-app purchases.
Is OpenCCman Open Chinese Convert free?
OpenCCman Open Chinese Convert is free to download, with in-app purchases available.
Do CMCalc or OpenCCman Open Chinese Convert have ads?
Neither CMCalc nor OpenCCman Open Chinese Convert shows ads.
Which is updated more often, CMCalc or OpenCCman Open Chinese Convert?
CMCalc ships an update every 45 months, and OpenCCman Open Chinese Convert every 3 months. Most recently, CMCalc was updated on October 24, 2026 and OpenCCman Open Chinese Convert on October 25, 2026.

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