Comparison

Complex RPN Calculator vs Calculator #

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

Calculator #

This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.

Highlights
  • Math Photos Solver
  • Handwriting Recognition
  • AI Math Problem Solver
  • Mathematical Display
  • Equation Solvers
  • 2D Graphing
  • Algebraic Functions
Features
Read full description

◉ Over 11,000,000 Downloads Worldwide ◉ Top Free Utilities Apps in US, UK, AUS, CAN, GER,... ◉ Rated & Reviewed on ILoveFreeSoftware.com FREE Alternative to Graphing TI-83, TI-84, TI-89, Casio FX, Sharp EL,... Calculator # – The free, multi-function calculator for iPhone/iPad is proud to offer a variety of features to satisfy wide ranges of customers: The App possesses a powerful math core and algebra engine with mathematical display support, making it a viable tool for everyone from those looking for basic calculation to more advanced users, such as scientific computation, engineers, and math students. Calculator # makes available everything you need – including a user manual and tutorial video clips – so you can master the app in a matter of minutes! ◉ Official Website: http://iPhoneCalculator.com ◉ ADVANCED FEATURES: ▸ Math Photos Solver * ▸ Handwriting Recognition * ▸ Math Problem Solver (AI) * ◉ GENERAL FEATURES: ▸ Universal Calculator App ▸ Support All the Latest Devices ¹ ▸ Support Multitasking (iPad) ▸ Support Wireless KB ² ▸ Mathematical Display ▸ Edit & Export Expression/Result ▸ History Tape View ▸ Basic Calculations (+, -, x, ÷, %, Abs,...) ▸ Advanced Functions (Sin,Cos,Ln,X!, ^, √,…) ▸ 14 Memory Variables (Including X,Y,Z,M) ▸ Assignment Operator ▸ F(x) Customize Functions (F1 Only) ▸ Fraction and Degree/Angle Calculation ▸ Numeric Integral Calculation ▸ Dual Skins (Silver Light & Carbon+) ◉ ALGEBRA FEATURES: ▸ Big Integer & Rational Number (Up to 30!) ▸ Expand and Factor Polynomials ▸ Basic Indefinite integral ◉ EQUATIONS SOLVERS: ▸ Quadratic Equations ▸ System of Linear Equations (2 Unknowns) ◉ 2D GRAPH: ▸ Snap to Points ▸ Smooth Zoom & Transformation ▸ Support F(X,Y) = 0. E.g. Sin(X) + Cos(Y) = 0. ◉ MULTIPLE LANGUAGES: ▸ English, Spanish, German, ▸ French, Japanese, Chinese (*) In-App-Purchase is required ¹: Include iPhone 6/6S+ HD Retina Display ²: Standard English KB We love your feedback, Thanks a lot ! Terms of Service: https://iphonecalculator.com/terms-of-service/

Screenshots

Complex RPN Calculator4 screens
Calculator #4 screens

Verdict

The call

The clearest difference is rating: Calculator # at 4.6 against Complex RPN Calculator's 3.8. Calculator # also leads on ratings volume (36K vs 22) and update cadence (every 2 months vs every 5 months). Complex RPN Calculator's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price 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. Calculator # sells 6 in-app purchases, starting at $1.49 per month. Complex RPN Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Calculator # holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 22, 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 60% of Calculator #'s.

UpkeepUpdate frequency

Complex RPN Calculator ships an update every 5 months, Calculator # every 2 months. The most recent releases landed on August 23, 2026 and September 24, 2026 respectively.

Scorecard8 real differences · 2 level
Complex RPN Calculator versus Calculator #: the parameters behind the verdict, then further details
ParameterComplex RPN CalculatorCalculator #
PriceFreeFree
Rating3.8 (22 ratings)4.6 (36K ratings) — better
Positive reviews51.7% of reviews60.0% of reviews — better
Number of ratings2236K — better
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.412.1 — better
Further details — not scored
Size1 MB57 MB
Age rating4+4+
DeveloperJohn CoddingtonIncpt.Mobis

Customer experience

Complex RPN Calculator

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

Calculator #

All ratings35,876 ratings
Positive90.4%
Neutral3.8%
Negative5.8%
Written reviews463 reviews
Positive60.0%
Neutral6.5%
Negative33.5%

User reviews

Complex RPN Calculator

From 22 App Store ratings

What we love

  • ✅ Great RPN functionality
  • ✨ Complex number support
  • 🆓 Free to use
  • 🚫 No ads or in-app purchases
  • 💻 Works on macOS

Room to improve

  • 🎨 SwiftUI design is ugly
  • 🐌 Slow keyboard response
  • 🖱️ Clunky operation
  • 📉 Complex number operations limited
  • ⚠️ Broken on newer iOS versions (historically)

Calculator #

From 36K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Powerful functionality
  • 💡 Helpful for math classes
  • ⭐ Great for students
  • 👌 Works like a real calculator

Room to improve

  • 🔍 Confusing interface after update
  • 📢 Too many intrusive ads
  • 💰 Paywall for advanced features
  • 🐛 Incorrect calculations
  • 🔇 Loud audio ads

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

Calculator #

Reported bugs

3 issues
  • Crashes when trying to use certain functions
  • Handwriting recognition not working reliably
  • Inability to input negative numbers

Requested features

3 requests
  • Add option to turn off animation
  • Improve ad placement to avoid obstructing usage
  • Provide more transparency on paid features

In-app purchases

None

Complex RPN Calculator

No in-app purchases

6 purchases

Calculator #

Subscriptions4
  • PRO Upgrade 1 Month3 Days trial$1.491 Month
  • PRO Upgrade 3 Months7 Days trial$2.993 Months
  • PRO + Recognition 1 Month$4.991 Month
Show 1 more
  • PRO + Recognition 3 Months$11.993 Months
One-time2
  • 250 AI Recognition & Queries$0.99
  • 600 AI Recognition & Queries$1.99

Questions

Is Complex RPN Calculator free?
Complex RPN Calculator is free to download, with no in-app purchases.
Is Calculator # free?
Calculator # is free to download, with in-app purchases available.
Which has better reviews, Complex RPN Calculator or Calculator #?
Calculator # is rated higher. Complex RPN Calculator averages 3.8 out of 5 from 22 ratings, while Calculator # averages 4.6 from 36K ratings.
Do Complex RPN Calculator or Calculator # have ads?
Calculator # shows ads; Complex RPN Calculator does not.
Which is updated more often, Complex RPN Calculator or Calculator #?
Complex RPN Calculator ships an update every 5 months, and Calculator # every 2 months. Most recently, Complex RPN Calculator was updated on August 23, 2026 and Calculator # on September 24, 2026.

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