Comparison

Complex RPN Calculator vs SwiftRPN

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

Head to head
About

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.

Highlights
  • Complex number support
  • Four-level stack
  • Polar and rectangular formats
  • State persistence
  • 10 memory locations
  • Scientific calculations
Features
Read full description

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.

About

SwiftRPN

Read full description

SwiftRPN is an RPN (Reverse Polish Notation) calculator that aims to be quick to open and easy to use. = RPN Stack Work quickly and efficiently using the RPN Stack by pushing and popping values. The stack will always show what series of inputs led to each output, so you won't lose context during complicated expressions. = Extended Types SwiftRPN can understand scalar types like integers and real numbers, as well as vectors and square matrices of sizes 2, 3, and 4. When operating purely in the scalar integer domain, SwiftRPN can promote up to BigInts to avoid floating point imprecision. = Operators SwiftRPN has 84 built-in operators with included documentation and examples. All the expected operators (basic arithmetic, exponents, logarithms) are present, as are: - Rounding functions (floor/ceil/trunc/round) - Unit conversions - Bitwise operations (and/or/not/xor/shift left/shift right) - Statistics (avg/min/max/sum/std dev/NPV) - Trigonometry (sin/cos/tan + arc/hyperbolic variants) - Vector operations (dot/cross/normalize/length/swizzle) - Matrix operations (identity/inverse/transpose + translation/scale/rotation matrix generators) = Unit Conversions SwiftRPN has 74 built-in units, and can convert between units within families, including: - Angle - Area - Colors (3 and 4 components) - Coordinate systems (2D and 3D) - Length - Mass - Storage (Base 10 [SI, 1000 bytes in a kb] and Base 2 [1024 bytes in a kb]) - Temperature - Time - Volume = Value Representation SwiftRPN recognizes values represented in binary, octal, decimal, and hexidecimal. You can: - Enter values in one representation, and convert them to another - See the result of bitwise operations in binary automatically - View vec3 and vec4 components (truncated) in hexidecimal when working with colors.

Screenshots

Complex RPN Calculator4 screens
SwiftRPN4 screens

Verdict

The call

The clearest difference is rating: SwiftRPN at 5.0 against Complex RPN Calculator's 3.9. Complex RPN Calculator's advantage is ratings volume (24 vs 1) and update cadence (every 5 months vs every 14 months). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SwiftRPN holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Complex RPN Calculator ships an update every 5 months, SwiftRPN every 14 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Complex RPN Calculator versus SwiftRPN: the parameters behind the verdict, then further details
ParameterComplex RPN CalculatorSwiftRPN
PriceFreeFree
Rating3.9 (24 ratings)5.0 (1 ratings) — better
Positive reviews51.7% of reviews—
Number of ratings24 — better1
Update frequencyEvery 5 months — betterEvery 14 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 — better17.6
Further details — not scored
Size1 MB3 MB
Age rating4+4+
DeveloperJohn CoddingtonPatrick Gelvin

Customer experience

Complex RPN Calculator

All ratings22 ratings
Positive72.7%
Neutral0.0%
Negative27.3%
Written reviews87 reviews
Positive51.7%
Neutral8.0%
Negative40.2%

SwiftRPN

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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)
Show 1 more
  • 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)
Show 19 more
  • 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

SwiftRPN

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Complex RPN Calculator

No in-app purchases

None

SwiftRPN

No in-app purchases

Questions

Is Complex RPN Calculator free?
Complex RPN Calculator is free to download, with no in-app purchases.
Is SwiftRPN free?
SwiftRPN is free to download, with no in-app purchases.
Which has better reviews, Complex RPN Calculator or SwiftRPN?
SwiftRPN is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while SwiftRPN averages 5.0 from 1 ratings.
Do Complex RPN Calculator or SwiftRPN have ads?
Neither Complex RPN Calculator nor SwiftRPN shows ads.
Which is updated more often, Complex RPN Calculator or SwiftRPN?
Complex RPN Calculator ships an update every 5 months, and SwiftRPN every 14 months. Most recently, Complex RPN Calculator was updated on October 21, 2026 and SwiftRPN on October 24, 2026.

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