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Twin Calc

Twin Calc



★ 50% off as always ★

Get two real-size and cute calculators working simultaneously and independently by simply rotating your iPad!

★ ★ ★ ★ ★ About 75% five-star rating in US, Japan, Germany, Taiwan, etc.

★ ★ ★ ★ ★ 1-st Paid iPad Calculator and Overall Paid App Ranked 46-th in Japan(2011)

★ ★ ★ ★ ★ Support calculation history notes with E-mail out feature

★ ★ ★ ★ ★ New Sounds and Skins

★ ★ ★ ★ ★ Support 2 Hex-Decimal Converters

Sometimes we are just hoping that we have another calculator to complete some complex calculation.

Twin Calc gives you a big general purpose HD calculator in Portrait and magically becomes two cute twin calculators by rotating your iPad to Landscape.

It's so cool and so much fun!

What you can do with 2 calculators operating simultaneously?

Some ideas for you:

☞ It's a great feature if you don't know what MR, MC, M+, M- is. Simply add up your numbers by additional calculator!

☞ You got two children, and got one iPad only.

☞ Well, you can now have a fair competition with your friends or family for seeing that who is using calculator faster!

☞ Show your friends how cool your iPad is!

☞ Use your two hands to calc if you can. (If you really can do that, please show me :D )


☞ Calculate between two calc is possible. Add/Sub/Mul/Div calc-1's result to calc-2 by tapping the number displayed on the top.

☞ Calculation history notes with mailto function. (You will find how useful it is)

☞ 2 Hex and Decimal convertors. (Engineer in CS? You would love this supported, 32bits only though)

☞ In landscape, you can tap result number on the top to use its number on the other calculator. (Just like another MR)

☞ Switch for tapping sound mute/un-mute.

☞ Support 2 real-size calculators operating simultaneously and smoothly.

☞ 4 different tapping sounds. (Number buttons, Function buttons, history clear, mailout)

☞ All data/number will be restored in next run.

☞ Support continuous operation. (++, , xx, ÷÷)

☞ Maximum 15 digits support (including integer and float)

☞ Support M+, M-, MR, MC.

☞ Support %, √, and back.

## Examples of user friendly usage ##

'9', 'x', '5', '%' ... 0.45 (No need to press '=')

'2', 'x', '5', 'M+' ... 10 (No need to press '=')

'1500', '+', '10', '%' ... 1650 (% substract is also OK)


☞ You must own an iPad and that's all!

Hope you enjoy this app!

Will really appreciate if you give a rate when you find it useful. Thanks for your encouragement in advance!

PS. The text "Demo Edition" appears in the setting menu by mistake in v1.5. This doesn't affect any function and would be corrected in next release.

What's New in Version 1.5

- Fixed float point errors in minus operation.
- iOS 5 tested.

iPad Screenshots

Twin Calc iPad Screenshot 1
Twin Calc iPad Screenshot 2
Twin Calc iPad Screenshot 3
Twin Calc iPad Screenshot 4

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Rated 5/5 based on 1 customer reviews.


5/5 stars

Great concept and execution!

I first looked at this app and thought what a silly idea. Who needs two calculators? But I decided to buy it because I needed a calc on the new iPad. Well, the silly one was me - this is fantastic! Very logically designed, useful, beyond intuitive and it keeps a running record. If you need a calc, look no further. It is now the only one I use. And the answer to who needs two calculators - I do, but did not know it until now. Great app.


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The information may be outdated (2017-03-08 20:52:35). For actual information go to iTunes

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