RPN vs QODE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
QODE
Enhance your keyboard experience with this app. Monitor battery life, quickly launch your favorite apps and websites with custom shortcuts, and manage multiple language layouts. Stay updated with the latest software and provide direct feedback to the development team.
- Battery life indicator
- Quick-launch app shortcuts
- Multiple language/layout options
- Software update notifications
- Direct customer feedback channel
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The first of its kind, the QODE App is the perfect companion to our award-winning keyboards. The QODE App acts as a concierge for your keyboard, offering: Battery life indicator Never guess when to charge your keyboard. The App keeps a constant eye on your battery, letting you know how much power you have left, and notifies you when it’s time to charge up. Quick-launch shortcuts for your favorite apps Forget swiping and searching for your apps, set up Quick Launch keys to access apps and websites using simple keystrokes on your keyboard. Your favorite destinations are only a keystroke away. Multiple keyboard language/layout options Much like you, our keyboards speak multiple languages. Cycle through different languages available on your keyboard, and see them laid out on screen. You can even print or save the layouts for reference while you work. Language Layout Support for: US English UK English Traditional Chinese Simplified Chinese French German Spanish Italian Swedish Danish Russian Turkish Korean Japanese Thai Software updates While you work, the App regularly checks for software updates to enhance your keyboard. It will instantly notify you of any new software and ask if, and when, you would like to install it. Customer feedback options The App connects you directly to the QODE team giving us feedback on your experiences. Whether it’s a suggestion to improve our keyboards, finding the answer to a question, or just to tell us how you like the App, we look forward to hearing from you! Compatible with the following QODE keyboards: • Ultimate Pro for iPad Air 2 (F5L176) • Ultimate Pro for iPad Air (F5L171)
Verdict
The clearest difference is review sentiment: RPN at 90% against QODE's 14%. RPN also leads on rating (4.3 vs 3.5) and update cadence (every 3 months vs every 8 months). QODE's advantage is price (Free vs $4.99) and ratings volume (24 vs 6). On ads, in-app purchases and device support 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
QODE is free to download; RPN costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPN holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 6 and 24 respectively. Written reviews point the same way: 90% of RPN's written reviews are positive against 14% of QODE's.
RPN ships an update every 3 months, QODE every 8 months. Both last shipped on October 12, 2026.
| Parameter | RPN | QODE |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.3 (6 ratings) — better | 3.5 (24 ratings) |
| Positive reviews | 90.0% of reviews — better | 13.9% of reviews |
| Number of ratings | 6 | 24 — better |
| Update frequency | Every 3 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPad | iPad |
| Requires iOS | 12.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 78 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | CuVee Software | Belkin International, Inc. |
Customer experience
RPN
QODE
Bugs and requests
RPN
Not enough reviews yet to summarise bugs or requests.
QODE
Reported bugs
14 issues- Firmware update fails on iOS 9.1 and above
- App stuck on splash screen
- Keyboard shortcuts only work within QODE app
- Shortcuts require manual screen tap confirmation
- App crashes when customizing keys
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- Bluetooth connection drops every 10 minutes
- Backspace key stops working
- App doesn't recognize paired keyboard
- Feedback email button non-functional
- Language switching not working properly
- App shows incorrect keyboard layout (AZERTY vs QWERTY)
- Firmware update notification persists despite incompatibility
- Accessibility lag when using zoom feature
- Battery percentage indicator inaccurate
Requested features
10 requests- Update app for latest iOS versions
- Shortcuts should work without screen confirmation tap
- Support for all QODE keyboard models
- Keyboard remapping functionality
- Ability to disable Siri button
Show 5 moreShow fewer
- Shortcuts for any app, not just recognized ones
- Working feedback/support email system
- Improved documentation for setup and features
- Firmware update via computer as alternative
- Battery indicator in status bar like other devices
In-app purchases
RPN
No in-app purchases
QODE
No in-app purchases









