The program supports multiple modes, including enabling it to be used as a programmable calculator with a then-popular reverse Polish notation (RPN) input method.

On the screenshots of the program, printed in grayscale in the manual, the title in the main window changed to CALCULATOR COPYRIGHT (C) ATARI 1979.

[10][11] In June 1982, the "Calculator: Instruction Manual" book was printed by the APX, noted with "User-Written Software for Atari Computers" on the cover, and the program got product ID number APX-20130.

[14][15][16] On 12 October 2011, Benj Edwards,[17] a tech reporter and historian, published on the "Vintage Computing & Gaming" site the transcription of the interview with Carol Shaw, who left Atari after 1980.

[22][23][24] In October 2014, Norbert Kehrer created free simulators of the Hewlett-Packard RPN calculators (HP-35, HP-45, HP-55 and HP-80) for Atari 800XL and Commodore 64.

[28] In the late 1980s, Atari produced a line of hardware desktop and pocket calculators, but none of them had programming support and an RPN input.

[34][35] Cover illustration also includes a sign in a lower right corner in a form of mathematical formula to say "Thank you", used by Atari community to honor notable contributors:[36]

Rapp also designed a label for the possible future ROM cartridge release of the Atari Calculator, reserving ID number CXL-4028.

[37] On 27—28 April 2013, the Atari Calculator was displayed at the 14th Vintage Computer Festival Europe (VCFe) in Munich, and Vortrag Wassenberg made its presentation.

The podcast site also published the source of the example program for the Atari Calculator, newly created cheat sheet, screenshots of software screen in various modes and an excerpt from the original user manual showing a mistake on instruction illustration.

[49][50][51] On 4 September 2020, Savetz released on GitHub source files of the Colleen Calculator, recovered and reconstructed from scanned printouts.