10 Key iPhone





10 Key Adding Machine for the iPhone was designed with Accountants and CPAs in mind. It is a single-column adding device that behaves the same as a 10 Key adding machine like those found in an office supply store. With '10 Key' though, you can edit mistakes like fixing a number, changing an operator, or adding or deleting a line. Want to come back to a calculation later?  Paper tapes can be saved, renamed, opened, and deleted, and you can export a PDF file to iBooks, Dropbox, Email, or your favorite printing utility. If your an Accountant or CPA you'll find this App to be a useful and familiar tool.

Also check out our full-sized 10 Key for iPad App with a full-size (1:1) keypad. Find it here.

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Right side operator entry

If you're an Accountant or a CPA you know what that means. A '10 Key' calculator sequences a number followed by an operator (+-/x). Also, the mixing of + - with x /, and the use of a % key are structured similarly as well.

Mistakes happen

How many times have you added a long column of numbers only to find a mistake? With 10 Key Adding Machine fix it with a touch of a line, an edit, and an exit. Do about anything you want including changing operators, and adding or deleting lines as needed. Old printing calculators will never be adequate again.


Add comments to any line

Take commenting and notation to a new level with full alphanumeric comments. Notation is no longer limited to the old cryptic #/♢ notation.

Save files

We put in a sophisticated, but simple to use file system so you can manage, save, delete and open all your calculating tasks. Save invoices in progress, update expense reports, or come back to the long column of checks that your were adding at a later time.

Check your history

The 400 line scrollable paper tape will make your life easier. Check the accuracy of your numbers, look at old calculations. Even bring an old result into your current calculation.

Export a PDF file to iBooks, Dropbox, Email, or your favorite printing utility

Want a printout of your paper tape for your files or reference? 10 Key Adding Machine will export a PDF to the iOS pasteboard, email, or your favorite printing utility. Or you can print directly. Just make sure your device is running iOS4.2.1 or later.

Select a TOTAL ( '*' ) key on the left ot right side

Depending on how and when you were first introduced to a '10 key', the TOTAL key ( '*' ) was either left or right sided. It's easy to configure '10 Key Adding Machine' to either configuration.



Available at the App Store


  • Faithful replication of a '10 Key' adding machine's behavior.
  • 400 Lines of virtual paper tape for review and edit.
  • Add comments to any line
  • Export a PDF file to iBooks, Dropbox, Email, or your favorite printing utility
  • Save files for later reference of edit.
  • Place the Total ( '*' ) key on the left or right side.
  • Swipe left for full screen paper tape view.


  • iPhone, iPod/Touch with iOS3.1 or greater.
  • Print with iOS4.2.1 with any Apple supported Airprint printers.