Calculator ‪×‬ 4+

let's reinvent the calculator

DOUBLE U s.r.o.

Designed for iPad

    • 4.5 • 142 Ratings
    • Free
    • Offers In-App Purchases



Designed exclusively for today's touch-screen devices, this calculator app represents a groundbreaking paradigm shift, leaving behind the outdated design patterns of mechanical calculators. We have meticulously crafted a new design from scratch, keeping modern touch-screen devices at the forefront of our innovation.

• Tape Log: All your calculations are securely stored in the tape log, ensuring you never lose track of your numerical journey.
• Calculation Management: Effortlessly reuse, copy, or share calculations to integrate them seamlessly into your work or daily life.
• Formula Evaluation: Enter entire formulas in one line for swift and accurate evaluation, simplifying complex calculations.
• iPad Multitasking: Experience true productivity with iPad multitasking support, enabling you to perform calculations while using other apps through Slide Over and Split View.

Calculator Pro represents a powerful departure from traditional calculators, offering a tailored experience for touch-screen devices. Download now and embrace a new era of calculations with maximum control and power at your fingertips.

Terms of Use:

What’s New

Version 2.0.2

• bug fix
• ability to have calculations right or left aligned
• improved design
• improved number formatting
• long-tap for cell's context menu
• scroll the keyboard to the left for advanced functions
• improvements and bug fixes

If there is a problem, please let us know via the app menu.
If you like the app, please leave a positive review.
Thank you for all the feedback, reviews, and support.

Ratings and Reviews

4.5 out of 5
142 Ratings

142 Ratings

blanktimes ,

The calculator I was looking for.

This is the calculator I was looking for. I recently subscribed to the ‘removed ads’ version because this is the one calculator app that had the features I was looking for. For example, I can easily see the last inputs because there is a history panel which you can scroll up and down with the swipe of a finger. I also enjoy the ‘last’ button feature that allows me to do calculations in where I can use my previous calculated sum—multiply/subtract/etc it by an even prior sum, easily accessible via the history feed. Thanks.

LilacDoe ,

Solid Basic Calculator

This let’s you fully type out multi-expression math problems. It can’t do anything too fancy, it’s just a solid replacement for the basic calculator.

Also, if you close the app, the previous expressions stay in your history (I’m not sure about restarting the phone though).

GR747 ,

Finally no need to rotate.

Thank you for creating the only calculator app that gracefully gives you more options without having to rotate the screen awkwardly. Coming from a TI 83 background, this is perfect for basic scientific calculating needs.

Developer Response ,

Good point, thank you. We too believe you shouldn’t need to rotate for advanced functions.

App Privacy

The developer, DOUBLE U s.r.o., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers
  • Usage Data
  • Diagnostics

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers
  • Usage Data
  • Diagnostics

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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