Comparison

Calculator⁼ vs DoubleStruck Input

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

Head to head
About

Calculator⁼

This app offers a clean and intuitive interface for both basic arithmetic and advanced scientific calculations. It includes a history tape to review past computations and supports various mathematical operations, making it suitable for everyday use and complex problem-solving.

Highlights
  • Basic & Scientific Calculator
  • Live Currency Converter
  • History Tape
  • Equation Edit Function
  • Degrees or Radians Calculation
  • Memory Banks
Features
Read full description

Calculator is a clean, easy-to-use calculator app for everyday math and more. It handles basic calculations and scientific functions when you need them and keeps a history of your past results so you can quickly go back and check or reuse them. With its classic design, it feels familiar and straightforward—perfect for quick sums at work, school, or home. AVAILABLE FOR FREE • Basic & Scientific Calculator • Great Visibility; Big buttons for easy calculations • Live Currency Converter; get exchange rate prices • History Tape; Track all calculations, taxes, and expenses • Equation edit function • Calculate with Degrees or Radians • Memory Banks • Choose your Decimal Notation • Set the Number of Decimals • Available in 12 languages • Made for iPad & iPhone • Support Split View & Dark Mode BASIC AND SCIENTIFIC Rotate your device to access all scientific buttons. Or if you prefer calculating in portrait mode, simply swipe left. YOUR EXPERIENCE IS IMPORTANT TO US! As your experience is important to us, we’re happy with your feedback, questions, and suggestions. Please share any support as our team is always ready to help via support@impalastudios.com Mathematical Operations Addition, Subtraction, Division, Multiplication, Percentages, Square, Cubic Exponent, Nth Exponent, Square Root, Cubic Root, Nth Root, Engineering Exponent, Factorial, Power of Two, Power of Ten, Power of E, Natural Logarithm, Common Logarithm, Binary Logarithm, Sine, Cosine, Tangent, Arc Sine, Arc Cosine, Arc Tangent, Hyperbolic Sine, Hyperbolic Cosine, Hyperbolic Tangent, Hyperbolic ArcSine, Hyperbolic Arc Cosine, Hyperbolic ArcTangent, Multiplicative Inverse, Random Number Input LOVING CALCULATOR? Please show your support by rating us! Thank you. Calculator (C) 2011 Impala Studios Terms & Conditions: https://impalastudios.com/terms Privacy Policy: https://impalastudios.com/privacy

About

DoubleStruck Input

Features
Read full description

First of all, this is not just an application. DoubleStruck Input is a keyboard that works just like any other keyboard on your phone, and simulates the DoubleStruck font! Yes, any application, any smartphone! Take a look on the screenshots to see the keys and their possible variants! === Problems seeing the double struck keys? === In some cases, users can have issues to see the new keyboard on the Keyboard list. We recommend that you restart the phone and close all the applications before and after installing/configuring the app. If you have any question related to that, contact us via contato@hodstudio.com.br You will need to follow these steps to install and configure your DoubleStruck Input keyboard: - After installation, go to "Settings" - Select "General" - Select "Keyboards" - Select "Add new keyboard" - Select DoubleStruck Input When using an app, the iPhone/iPad will show a Globe icon or button at the bottom. By holding on it, you can choose which keyboard you want to use. Select DoubleStruck Input and start writing with the double struck characters! PRIVACY POLICE DoubleStruck Input aims to spread and facilitate the use of runes by anyone. Because it’s a keyboard, operational system can display an default alerts to inform that keyboards can capture data typed by users and send them to third parties. That is not the case with DoubleStruck Input. We collect and process only data on app usage statistics, as well as error/crash information. What does that mean? - It is not necessary to create an account and the app will not request any personal data. - No data typed with DoubleStruck Input is sent anywhere. Typed characters are transferred to the operational system of the mobile, which will be standard processed, like inserting them on a text field. - No personal data is collected. Only usage statistics and error/crash information are collected, which are processed directly by Google’s servers.

Screenshots

Calculator⁼4 screens
DoubleStruck Input4 screens

Verdict

The call

The clearest difference is price: Calculator⁼ at Free against DoubleStruck Input's $1.99. Calculator⁼ also leads on update cadence (monthly vs every 41 months). DoubleStruck Input's advantage is in-app purchases (none vs 8) and ads (none vs shown). On device support and iOS requirement 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; DoubleStruck Input costs $1.99 up front. Calculator⁼ sells 8 in-app purchases, starting at $0.49 per 7 days. DoubleStruck Input asks for nothing beyond the download.

UpkeepUpdate frequency

Calculator⁼ ships an update monthly, DoubleStruck Input every 41 months. The most recent releases landed on October 30, 2026 and October 15, 2026 respectively.

Scorecard4 real differences · 6 level
Calculator⁼ versus DoubleStruck Input: the parameters behind the verdict, then further details
ParameterCalculator⁼DoubleStruck Input
PriceFree — better$1.99
Rating4.6 (359K ratings) — better—
Positive reviews35.6% of reviews—
Number of ratings359K — better—
Update frequencyMonthly — betterEvery 41 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size159 MB2 MB
Age rating4+4+
DeveloperImpala StudiosPablo Cussa de Souza

Bugs and requests

Calculator⁼

Reported bugs

3 issues
  • History not always showing all entries
  • Ads covering up parts of the screen
  • Inability to close full-screen ads

Requested features

4 requests
  • Add fraction button
  • Option to clear calculation history
  • Ability to copy/paste results
  • Customizable layout and themes

DoubleStruck Input

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Calculator⁼

Subscriptions6
  • Weekly Premium Access3 Days trial$0.497 Days
  • Monthly full access3 Days trial$1.991 Month
  • Weekly Premium Access3 Days trial$1.997 Days
Show 3 more
  • Limited Time Offer$4.991 Year
  • Premium Yearly3 Days trial$5.991 Year
  • Annual Premium Access$9.991 Year
One-time2
  • Retro Theme Calculator'$0.99
  • Lifetime Full Access$14.99
None

DoubleStruck Input

No in-app purchases

Questions

Is Calculator⁼ free?
Calculator⁼ is free to download, with in-app purchases available.
Is DoubleStruck Input free?
DoubleStruck Input costs $1.99, with no in-app purchases.
Do Calculator⁼ or DoubleStruck Input have ads?
Calculator⁼ shows ads; DoubleStruck Input does not.
Which is updated more often, Calculator⁼ or DoubleStruck Input?
Calculator⁼ ships an update monthly, and DoubleStruck Input every 41 months. Most recently, Calculator⁼ was updated on October 30, 2026 and DoubleStruck Input on October 15, 2026.

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