Comparison

Calculator # vs One Converter

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

One Converter

Easily convert between thousands of measurement units for daily life, lessons, or work. This tool offers a simple interface to convert any unit within various categories, including length, velocity, temperature, mass, volume, and more. It functions entirely offline, making it a convenient measurement conversion tool.

Highlights
  • Extensive unit conversion categories
  • Simple and useful interface
  • Offline functionality
  • Supports thousands of units
  • Daily life, lessons, and work utility
  • Metric and US measurement support
Features
Read full description

The best measurement, unit, metric converter app for iOS! Unit conversion tool that you may need in your daily life, in your lessons, and at work. With a simple, useful interface, you can convert any unit you want to another unit and use it in your calculations. All you have to do is enter the category and choose the units to convert the amount. It's that simple! You can easily convert commonly used units with our unit conversion tool. This app a universal unit converter and measure tool that can convert units of different categories. - Length Converter: Angstrom, Astronomic Unit, Centimeter, Chain, Fathom, Feet, Furlong, Inch, Kilometer, Light Year, Meter, Mile, Millimeter, Nautical Mile, Parsec, Yard - Velocity (Speed) Converter: Centimeters Per Hour / Per Minute / Per Second, Feet Per Hour / Per Minute / Per Second, Furlongs Per Fortnight, Inches Per Hour / Per Minute / Per Second, Kilometers Per Hour / Per Minute / Per Second, Knots, Light, March, Meters Per Hour / Per Minute / Per Second, Miles Per Hour / Per Minute / Per Second - Temperature Converter: Celsius, Fahrenheit, Kelvin, Rankine Raumur - Mass (Weight) Converter: Atomic Mass Unit, Drachm, Dram, Firkin, Grain, Gram, Hundred Weight, Kilogram, Milligram, Pennyweight, Quarter, Scruple, Short Hundredweight, Short Ton, Slug, Stone, Tonne, Troy Ounce, Troy Pound, UK Ton, US Ounce, US Pound - Volume (Capacity) Converter: Centiliters, Coffee Spon, Cubic Centimeter, Cubic Decimeter, Cubic Feet, Cubic Inch, Cubic Kilometer, Cubic Meter, Cubic Mile, Cubic Millimeter, Cubic Yard, Cup, Dashes, Deciliter, Drachm, Dram, Drop, Dry Barrel, Gallon, Liquid Barrel, Liter, Millimeter, Pinche, Tablespoon, Teaspoon, UK Bushel, UK Fluid Ounce, UK Gallon, UK Gill, UK Minim, UK Peck, UK Pint, UK Quart, US Bushel, US Fluid Ounce, US Gill, US Liquid Quard, US Minim, US Peck - Angle Converter: Circle, Degree, Gon, Grade, Mil, Minute, Nautical Rhumb, Quadrant, Radian, Revolution, Second, Turn - Energy Converter: BTU, Calorie, Electron Volt, Ergs, Foot Pound Force, Joule, Kilogram Force Meter, Kilowatt Hour, Newton Meter, Therm, Watt Hour - Time Converter: Blink, Century, Cesium133, Day, Decade, Fortnight, Hour, Lunar Year, Microfortnight, Microsecond, Millenia, Minute, Millisecond, Month, Nanosecond, Second, Sidereal Day, Sidereal Hour, Sidereal Minute, Sidereal Second, Sidereal Week, Sidereal Year, Tick, Week, Year - Area Converter: Acre, Barn, Hectare, Rood, Square Centimeter, Square Decimeter, Square Feet, Square Inch, Square Meter, Square Millimeter, Square Rod, Square Yard, Square Mile - Computer Data Converter - Female Shoe Size Converter - Male Shoe Size Converter - Speed Converter - Power Converter It is now effortless to translate between thousands of measurement units. Unit Converter works entirely offline without the need for an internet connection. A measurement conversion tool is here to make your life easier. Download now for free.

Screenshots

Calculator #4 screens
One Converter4 screens

Verdict

The call

The clearest difference is review sentiment: Calculator # at 60% against One Converter's 11%. Calculator # also leads on rating (4.6 vs 2.0) and ratings volume (36K vs 7). One Converter's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, monetization model 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 and One Converter sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calculator # holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 60% of Calculator #'s written reviews are positive against 11% of One Converter's.

UpkeepUpdate frequency

Calculator # ships an update every 2 months, One Converter every 2 weeks. The most recent releases landed on November 5, 2026 and November 2, 2026 respectively.

Scorecard6 real differences · 4 level
Calculator # versus One Converter: the parameters behind the verdict, then further details
ParameterCalculator #One Converter
PriceFreeFree
Rating4.6 (36K ratings) — better2.0 (7 ratings)
Positive reviews59.5% of reviews — better11.1% of reviews
Number of ratings36K — better7
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.1 — better14.0
Further details — not scored
Size57 MB15 MB
Age rating4+4+
DeveloperIncpt.MobisNovvio, Inc.

Customer experience

Calculator #

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

One Converter

All ratings7 ratings
Positive28.6%
Neutral0.0%
Negative71.4%
Written reviews9 reviews
Positive11.1%
Neutral0.0%
Negative88.9%

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

One Converter

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
5 purchases

One Converter

One-time5
  • Unit & Metric Converter Plus$1.99
  • Unit Converter & Calculator$3.99
  • Measurement Unit Converter Pro$4.99
Show 2 more
  • Unit & Metric Converter Plus$4.99
  • Unit Conversion Calculator Pro$5.99

Questions

Is Calculator # free?
Calculator # is free to download, with in-app purchases available.
Is One Converter free?
One Converter is free to download, with in-app purchases available.
Which has better reviews, Calculator # or One Converter?
Calculator # is rated higher. Calculator # averages 4.6 out of 5 from 36K ratings, while One Converter averages 2.0 from 7 ratings.
Do Calculator # or One Converter have ads?
Calculator # shows ads; One Converter does not.
Which is updated more often, Calculator # or One Converter?
Calculator # ships an update every 2 months, and One Converter every 2 weeks. Most recently, Calculator # was updated on November 5, 2026 and One Converter on November 2, 2026.

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