Calculator # vs Calculator RPN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Math Photos Solver
- Handwriting Recognition
- AI Math Problem Solver
- Mathematical Display
- Equation Solvers
- 2D Graphing
- Algebraic Functions
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◉ 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/
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.
- RPN calculation mode
- 54 mathematical functions
- Trigonometry (simple and hyperbolic)
- Coordinate and unit conversions
- Degrees and radians support
- Simple interface
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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
Verdict
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
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.
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.
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.
| Parameter | Calculator # | Calculator RPN |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.6 (36K ratings) | 4.7 (48 ratings) — better |
| Positive reviews | 59.5% of reviews | 60.0% of reviews — better |
| Number of ratings | 36K — better | 48 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac, Apple Watch — better |
| Requires iOS | 12.1 — better | 14.0 |
| Further details — not scored | ||
| Size | 57 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Incpt.Mobis | Benjamin Pisano |
Customer experience
Calculator #
Calculator RPN
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
Calculator #
- 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
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- PRO + Recognition 3 Months$11.993 Months
- 250 AI Recognition & Queries$0.99
- 600 AI Recognition & Queries$1.99
Calculator RPN
No in-app purchases
Questions
Is Calculator # free?
Is Calculator RPN free?
Which has better reviews, Calculator # or Calculator RPN?
Do Calculator # or Calculator RPN have ads?
Which is updated more often, Calculator # or Calculator RPN?
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