GO-21 SciRPN at Mac App Store analyse

App power index: 100 (based on ranks around App Stores today)
Utilities Productivity
Developer: BigCatOs
Price: 0 free
Current version: 5.5, last update: 4 years ago
First release : 17 Dec 2019
App size: 9.35 Mb
4.3 ( 6683 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


GO-21 SciRPN simulates the venerable HP-21 Pocket Scientific Calculator from 1975. Virtually indistinguishable from the real item in operation, GO-21 is a powerful yet simple retro calculator.

• RPN (Reverse Polish Notation)
• 10-digit LED calculator display, 10-99 to 10+99
• Four stack registers with roll down
• One storage register with arithmetic memory operators
• Math, trigonometric, polar/rectangular, logarithmic, power and other miscellaneous functions
• One additional window with views of:
◦ stack/storage registers
◦ keystroke log
• Copy-from and Paste-to the calculator display
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