Comparison

Calculator # vs Calculator RPN

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

Head to head
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/

About

Calculator RPN

This scientific calculator offers Reverse Polish Notation (RPN) for faster calculations. It includes 54 mathematical functions, coordinate conversions, and unit conversions, all within a simple interface.

Highlights
  • RPN calculation mode
  • 54 mathematical functions
  • Trigonometry (simple and hyperbolic)
  • Coordinate and unit conversions
  • Degrees and radians support
  • Simple interface
Features
Read full description

On this calculator you will be able to benefit from all the functions of a scientific calculator and RPN with the new iOS calculator. Thanks to the RPN mode you will be able to calculate sums at great speed which greatly reduces the typing. With a simple and uncluttered interface design, this calculaor includes 54 mathematical functions such as : • basic functions like natural logarythms, square roots and factorials • trigonometry (simple and hyperbolic) • it convertes polar and rectangular coordinates, decimal hours, hours, minutes and seconds • it can calculate degrees and radians And much more This calculator uses the very efficient and much talked about RPN system used by engineers and scientists, now on iOS.

Screenshots

Calculator #4 screens
Calculator RPN4 screens

Verdict

The call

The clearest difference is price: Calculator # at Free against Calculator RPN's $4.99. Calculator # also leads on ratings volume (36K vs 48) and iOS requirement (12.1 vs 14.0). Calculator RPN's advantage is in-app purchases (none vs 6) and ads (none vs shown). On rating and review sentiment 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

Calculator # is free to download; Calculator RPN costs $4.99 up front. Calculator # sells 6 in-app purchases, starting at $1.49 per month. Calculator RPN asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Calculator # against 4.7 for Calculator RPN. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 48, so its average is the more settled of the two. Written reviews split almost evenly too, at 60% and 60% positive.

UpkeepUpdate frequency

Calculator # ships an update every 2 months, Calculator RPN every 3 weeks. The most recent releases landed on November 8, 2026 and November 1, 2026 respectively.

Scorecard8 real differences · 2 level
Calculator # versus Calculator RPN: the parameters behind the verdict, then further details
ParameterCalculator #Calculator RPN
PriceFree — better$4.99
Rating4.6 (36K ratings)4.7 (48 ratings) — better
Positive reviews59.5% of reviews60.0% of reviews — better
Number of ratings36K — better48
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac, Apple Watch — better
Requires iOS12.1 — better14.0
Further details — not scored
Size57 MB16 MB
Age rating4+4+
DeveloperIncpt.MobisBenjamin Pisano

Customer experience

Calculator #

All ratings35,876 ratings
Positive90.4%
Neutral3.8%
Negative5.8%
Written reviews467 reviews
Positive59.5%
Neutral6.4%
Negative34.0%

Calculator RPN

All ratings48 ratings
Positive91.7%
Neutral0.0%
Negative8.3%
Written reviews45 reviews
Positive60.0%
Neutral8.9%
Negative31.1%

Bugs and requests

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

Calculator RPN

Not enough reviews yet to summarise bugs or requests.

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
None

Calculator RPN

No in-app purchases

Questions

Is Calculator # free?
Calculator # is free to download, with in-app purchases available.
Is Calculator RPN free?
Calculator RPN costs $4.99, with no in-app purchases.
Which has better reviews, Calculator # or Calculator RPN?
Calculator RPN is rated higher. Calculator # averages 4.6 out of 5 from 36K ratings, while Calculator RPN averages 4.7 from 48 ratings.
Do Calculator # or Calculator RPN have ads?
Calculator # shows ads; Calculator RPN does not.
Which is updated more often, Calculator # or Calculator RPN?
Calculator # ships an update every 2 months, and Calculator RPN every 3 weeks. Most recently, Calculator # was updated on November 8, 2026 and Calculator RPN on November 1, 2026.

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