Complex RPN Calculator vs OmniCounter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Complex RPN Calculator
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
- Complex number support
- Four-level stack
- Polar and rectangular formats
- State persistence
- 10 memory locations
- Scientific calculations
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Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.
OmniCounter
This app is a comprehensive calculator with support for basic, scientific, and advanced mathematical functions. It features a customizable keyboard, multiple input bases, and expression beautification. Enjoy a powerful, ad-free calculation experience.
- Supports over a dozen computing categories
- Customizable keyboard with auto-completion
- Multiple input bases (binary, octal, decimal, hex)
- Beautified input expressions
- Optional historical features
- Copy inputs and outputs
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It's a Fully Functional Calculator that supports basic, scientific, trigonometry, algebra, calculus, combinatorics, datetime, economics, geometry, matrix, vector, number theory, statistics, and so on. · This App is permanently ad-free. · This App uses a powerful computing engine to support up to a dozen categories of computing, including basic, scientific, trigonometry, algebra, calculus, combinatorics, datetime, economics, geometry, matrix, vector, number theory, statistics, and more. · This app provides a customized keyboard that supports automatic completion and parameter prompts. In addition, the app also supports the system to include input from other third-party keyboards. · This app supports binary, octal, decimal, binary, and hex inputs and outputs. · This app beautifies the input expressions in different colors and spaces. · This app offers optional historical features (on by default). · This app supports the copying of inputs and outputs. · This app provides a number of configurable parameters. · This app was ingeniously built all by myself.
Screenshots
Verdict
The clearest difference is review sentiment: OmniCounter at 100% against Complex RPN Calculator's 52%. OmniCounter also leads on rating (5.0 vs 3.8) and iOS requirement (13.0 vs 16.4). Complex RPN Calculator's advantage is in-app purchases (none vs 10) and ratings volume (22 vs 4). On price, update cadence, ads and monetization model 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
Both are free to download. OmniCounter sells 10 one-off in-app purchases. Complex RPN Calculator asks for nothing beyond the download.
OmniCounter holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 22 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 100% of OmniCounter's.
Complex RPN Calculator ships an update every 5 months, OmniCounter every 4 months. The most recent releases landed on August 23, 2026 and June 1, 2026 respectively.
| Parameter | Complex RPN Calculator | OmniCounter |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (22 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 51.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 22 — better | 4 |
| Update frequency | Every 5 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | John Coddington | 留传 于 |
Customer experience
Complex RPN Calculator
OmniCounter
Bugs and requests
Complex RPN Calculator
Reported bugs
6 issues- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)
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- Unreadable fonts on iPad (historical version 1.2 issue)
Requested features
24 requests- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)
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- Improve SwiftUI design (less whitespace)
- Show all stack levels
- Add angle function
- Add magnitude function
- Add 'Clear X' button
- Make RAD/DEG toggle button
- Single button for Sci/Eng/Fix/Raw modes
- Add '//' (parallel) function
- Add 'Module' button
- Change 'i' to 'j' for imaginary part
- Show stack levels
- Add log2 function
- Add logGamma function
- Smaller buttons
- Add complex conjugate button
- Add real part button
- Add imaginary part button
- Add modulo function
- Make app start faster
OmniCounter
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Complex RPN Calculator
No in-app purchases
OmniCounter
- Datetime$0.99
- Calculus$2.99
- Combinatorics$2.99
Show 7 moreShow fewer
- Economics$2.99
- Geometry$2.99
- Matrix & Vector$2.99
- SpecialFunction$2.99
- NumberTheory$2.99
- Statistics$2.99
- Trigonometry$2.99
Questions
Is Complex RPN Calculator free?
Is OmniCounter free?
Which has better reviews, Complex RPN Calculator or OmniCounter?
Do Complex RPN Calculator or OmniCounter have ads?
Which is updated more often, Complex RPN Calculator or OmniCounter?
Other comparisons
