Best apps like Halcyon Calc

10+ similar apps compared and reviewed

4.8 avg rating
2 free apps
Updated July 2026

Looking for something like Halcyon Calc? We've analyzed 10+ similar apps to help you find the best alternative. Each app is compared by ratings, features, and real user reviews, so you can make the right choice.

Top Alternatives to Halcyon Calc

GO-21 SciRPN#2

GO-21 SciRPN by Steve Lidie

Strong Contender
🔧 Utilities
4.9(12 ratings)
$2.99
GO-21 SciRPN screenshot 1
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This app faithfully recreates the 1975 HP-21 pocket scientific calculator, offering RPN functionality and a full suite of mathematical, trigonometric, and logarithmic functions. It features a 10-digit LED display, stack and storage registers, and a keystroke log for detailed operation tracking.

RPN-97 Pro#3

RPN-97 Pro by Willy Kunz

Vintage Desktop Calculator
Worth Considering
🔧 Utilities
4.9(11 ratings)
$4.99
RPN-97 Pro screenshot 1
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This app simulates a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run programs, manage virtual cards, and access hundreds of free program cards from its website.

More apps like Halcyon Calc

4
GO-25 SciRPN
GO-25 SciRPN
GO-25 SciRPN
by Steve Lidie
$4.99

This app faithfully recreates the HP-25C Programmable Scientific Calculator from 1976. It offers RPN input, a 10-digit LED display, and extensive mathematical functions. Users can program it with up to 99 steps and share programs via various methods.

RPN input10-digit LED displayFour stack registers
🔧 Utilities
(23)
paid
5
RCL-57
RCL-57
RCL-57
by Paul Novaes
Free

This app faithfully recreates the TI-57 programmable calculator, offering its full scientific functions and programming capabilities. It includes a user manual, sample programs, and features like turbo speed and alphanumeric display.

TI-57 recreationScientific functionsProgramming capabilities
🔧 Utilities
(0)
free
6
Plus42
Plus42
Plus42
Enhanced HP-42S Calc Simulator
$9.99

This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.

HP-42S RPN calculator simulationAlgebraic expressionsAttached units and conversions
🔧 Utilities
(76)
free
7
GO-29 SciRPN
GO-29 SciRPN
GO-29 SciRPN
by Steve Lidie
$6.99

This app offers a highly accurate simulation of the classic HP-29C programmable scientific calculator. It features RPN input, extensive storage registers, and a wide range of mathematical and statistical functions. Users can program complex calculations, import/export programs, and view detailed program information.

RPN input10-digit LED display simulationFour stack registers
🔧 Utilities
(4)
paid
8
RPN-25 CE
RPN-25 CE
RPN-25 CE
Highly popular 1975 calculator
$2.99

This app is a photo-realistic simulation of the classic HP-25 scientific calculator. It offers advanced programming features, a vast function library, and modern enhancements for enhanced usability on iOS devices.

Photo-realistic simulationProgrammable (99/999 steps)15 user-defined function keys
🔧 Utilities
(9)
paid
9
RPN-67 SD
RPN-67 SD
RPN-67 SD
Vintage Programmable Calc
$3.99

This app simulates a vintage programmable calculator from the mid-70s, offering enhanced features beyond the original. It allows users to run existing programs, manage virtual cards, and utilize advanced functions for scientific and engineering tasks.

Virtual program and data cardsVirtual paper tape printerDatabase-driven card manager
🔧 Utilities
(16)
paid
10
AutoMathic
AutoMathic
AutoMathic
The Smart Calculator
$1.99

This smart calculator automates complex math problems by translating conversational input into solvable equations. It offers three modes: scripted calculations, manual expression entry, and free-form English input for problem-solving.

Automated problem solvingConversational input translationScripted calculations
🔧 Utilities
(2)
paid