Comparison

RPN vs AFrame Pro

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

Head to head
About

RPN

This app is a faithful simulation of a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run existing programs, manage virtual program cards, and even print listings, all on their iPad.

Highlights
  • Virtual program and data cards
  • Virtual paper tape printer
  • Database-driven card manager
  • Save card collections to Mac/PC
  • Formatted program listings
  • Print listings via AirPrint
  • Live display of stack and registers
Features
Read full description

A dream calculator of the 70's, priced at $1,900 in today's dollars, now on your iPad! RPN-67 Pro is the first complete simulation of Hewlett-Packard's legendary HP-67 programmable calculator for iOS. Produced from 1976 to 1982, the HP-67's features coupled with its capability to store programs on magnetic cards made it a huge success among scientists, engineers and other professionals. Thousands of programs were written for it. Now you can run them right on your iPad, with more ease and faster than ever before. To get you started quickly, download hundreds of program cards from our website for free. What users said: "I am a collector of HP emulators on my iPad. The HP-67 is beyond spectacular!" "What an application! Perfect visual experience, perfect emulation, even the clicks are pleasant." "In many ways, the app is even better than the original - much faster, better and easier programming". RPN-67 Pro is fully compatible with RPN-97 Pro, its companion simulator of the HP-97 calculator. Features: • Virtual program and data cards • Virtual paper tape printer supports all HP-97 printer modes • Powerful database-driven card manager • Create, label, and organize a virtually unlimited number of cards • Use iTunes to effortlessly save entire card collections on your Mac/PC • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • Formatted listing clearly showing labels and targets of branches • E-mail listings and let the recipient paste the text right into RPN-67 • Print listings on any AirPrint-compatible printer • Program listing on paper tape shows subroutine nesting • Edit paper tape • E-mail paper tape, or print it via AirPrint • Cut/copy/paste displayed value or program steps • Paste existing HP-67 or HP-97 listings into RPN-67 and run them • "Live" display of stack, memory registers, program counter, flags • Show program usage notes • 30 selectable background images, even add your own • Fast: 0.8 secs vs. 6 mins (iPad Pro vs. HP-67, determinant of 5x5 matrix) • Low-battery indicator (iPad charge 10% or less) • Compatible with RPN-67 SD and RPN-97 Pro, CuVee Software's HP-97 simulation • Supports external hardware keyboard While RPN-67 Pro works like a real HP-67, changing a simple setting will turn the app into a super-charged HP-67: • Up to 999 program steps, 8 subroutine levels, 6 additional flags (F4...F9) • 100 additional registers • 100 additional labels • 100 built-in constants and conversions • More than 150 additional powerful operations and functions Plus: • 15 commands to print and manipulate any range of extended registers • Unrestricted register arithmetic • Exchange x with any register • Complex numbers, hyperbolic functions • Non-volatile memory - stack, registers, program, flags, paper tape • Status indicators for prefix keys (f, g, h, STO, RCL, etc.) • Display showing thousands separators (optional) • Text output on paper tape in 10 colors, even simple plotting • Stack-of-stack: push/pop the entire stack on internal stack (4 levels) • Single-step into subroutines (optional) • Powerful debugging aids, including 10 breakpoints with counters • Keycodes translated to command name while entering or single-stepping a program • Change the duration of the PAUSE command • Cancel SST or BST operation by simply sliding your finger off the depressed key • Compress constants in programs into a single step (reversible) • Use existing programs in text format by a simple paste operation RPN-67 Pro comes with more than 130 programs pre-installed, including HP Standard Pac, HP Business Decisions Pac, HP Math Pac I, HP Stat Pac I, and HP Surveying Pac I. The simulator has been verified to correctly run the examples given in HP Civil Engineering Pac I, HP Clinical Lab Pac, HP E.E. Pac I, HP Games Pac I, HP M.E. Pac I, HP Navigation Pac I, as well as large number of programs published in Users' Library Solutions. For more information and free program downloads visit the RPN-67 website: cuveesoft.ch/rpn67

About

AFrame Pro

This application provides tools for 2D frame analysis using the stiffness matrix method. It offers detailed calculations and generates reports for shear force diagrams, bending moment diagrams, frame deformation, and support reactions. Results can be easily shared in PDF format.

Highlights
  • Stiffness matrix method for 2D frame analysis
  • Detailed frame calculations
  • Reports for SFD, BMD, deformation, and reactions
  • PDF export and email results
  • User-friendly interface
Features
Read full description

Professional 2D Frame Structural Analysis AFrame Pro is a professional structural engineering application for analyzing two-dimensional frame structures using the Direct Stiffness Matrix Method. Designed for structural engineers, civil engineers, students, educators, and researchers, AFrame Pro combines a modern interface with powerful engineering calculations to help you create, analyze, and understand structural behavior anywhere. Design Structural Frames Create and edit structural models quickly with an intuitive graphical interface. • Interactive 2D frame editor • Multi-story and multi-bay frame generation • Grid frame templates • Node editing • Member editing • Support definitions • Point loads • Distributed loads • Moment loads • Pan and zoom controls Powerful Structural Analysis Analyze structures using the Direct Stiffness Matrix Method. Features include: • Global stiffness matrix assembly • Local stiffness matrices • Coordinate transformation matrices • Joint displacements • Member end forces • Support reactions • Equilibrium verification • Linear elastic analysis Material & Section Libraries Manage reusable engineering properties. • Material library • Elastic modulus • Cross-sectional area • Moment of inertia • Multiple material definitions Engineering Reports Generate comprehensive analysis reports including: • Equilibrium checks • Stiffness matrices • Transformation matrices • Member stiffness calculations • Support reactions • Member forces • Displacements • Calculation summaries Structural Diagrams Visualize structural behavior with: • Shear Force Diagrams (SFD) • Bending Moment Diagrams (BMD) • Deflected Shapes • Reaction forces • Applied loads Professional PDF Export Create engineering-quality PDF reports suitable for: • Design documentation • Engineering review • University assignments • Project records • Client presentations Multiple Unit Systems Supports both SI and US Customary units with automatic unit handling. Ideal For • Structural Engineers • Civil Engineers • Engineering Students • University Professors • Researchers • Engineering Consultants Whether you're solving classroom problems, checking structural behavior, or preparing professional engineering documentation, AFrame Pro delivers accurate analysis in a clean, modern workflow.

Screenshots

AFrame Pro4 screens

Verdict

The call

The clearest difference is review sentiment: RPN at 90% against AFrame Pro's 36%. RPN also leads on rating (4.3 vs 2.0) and iOS requirement (12.0 vs 18.6). AFrame Pro's advantage is update cadence (every 5 weeks vs every 3 months). On price, ratings volume, ads and in-app purchases 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

RPN costs $4.99 and AFrame Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RPN holds the better App Store score, 4.3 against 2.0. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews point the same way: 90% of RPN's written reviews are positive against 36% of AFrame Pro's.

UpkeepUpdate frequency

RPN ships an update every 3 months, AFrame Pro every 5 weeks. Both last shipped on September 21, 2026.

Scorecard4 real differences · 6 level
RPN versus AFrame Pro: the parameters behind the verdict, then further details
ParameterRPNAFrame Pro
Price$4.99$4.99
Rating4.3 (6 ratings) — better2.0 (4 ratings)
Positive reviews90.0% of reviews — better36.4% of reviews
Number of ratings6 — better4
Update frequencyEvery 3 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad — better
Requires iOS12.0 — better18.6
Further details — not scored
Size78 MB14 MB
Age rating4+4+
DeveloperCuVee SoftwareJutarus Ratanasethakul

Customer experience

RPN

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews20 reviews
Positive90.0%
Neutral0.0%
Negative10.0%

AFrame Pro

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews33 reviews
Positive36.4%
Neutral9.1%
Negative54.5%

In-app purchases

None

RPN

No in-app purchases

None

AFrame Pro

No in-app purchases

Questions

Is RPN free?
RPN costs $4.99, with no in-app purchases.
Is AFrame Pro free?
AFrame Pro costs $4.99, with no in-app purchases.
Which has better reviews, RPN or AFrame Pro?
RPN is rated higher. RPN averages 4.3 out of 5 from 6 ratings, while AFrame Pro averages 2.0 from 4 ratings.
Do RPN or AFrame Pro have ads?
Neither RPN nor AFrame Pro shows ads.
Which is updated more often, RPN or AFrame Pro?
RPN ships an update every 3 months, and AFrame Pro every 5 weeks. Most recently, RPN was updated on September 21, 2026 and AFrame Pro on September 21, 2026.

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