# Adding Machine 10Key Universal — True 10Key Adding Machine

> Digital 10-key adding machine with paper tape editing and export. (iPhone/iPad app by Richard Silverman.)

- Source: https://appshunter.io/ios/app/adding-machine-10key-universal/id579385939 (this page in markdown: same URL + `.md`)
- Developer: [Richard Silverman](https://appshunter.io/developer/297096643)
- Category: Finance, Business
- Price: $3.99 (on sale, was $5.99)
- Rating: 4.70/5 from 134 App Store ratings · 50 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.4 · 23 MB
- Languages: American English, French (France), German (Germany), Italian, European Spanish
- Released: 2012-11-26
- Data updated: 2026-09-12
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/adding-machine-10key-universal/id579385939/reviews.md

## What is Adding Machine 10Key Universal?

'Adding Machine 10Key Universal’ behaves like a true '10 Key' or 'adding machine' like those made by Monroe, Casio, Sharp and others. Press asterisk (*) for a total, operator entry is reversed, and calculate percentages by multiplying and adding to a stream of numbers. SEE THE 1ST FAQ BELOW.

This universal version works with both iPhone and iPad. The iPad version features a full sized (1:1) keypad with TypeTone, a unique audio aid to help guide your finger back to the center of a key. The total (*) key (iPad or iPhone) can be on either the left or right side (Sharp or Canon style). 

Also. Review & edit numbers, add or delete lines. Save & retrieve paper tape files. Export paper tape files to iBooks©, Dropbox©, or your favorite printing utility (see the FAQs).

====  Recent Press  =====
Has been featured in iTunes "What's Hot" in the Finance Category.

Strategic Finance (Tools of the Trade): "If you're looking for a professional desk calculator that can give you full 10-key accounting functions with a tape you can name and save, edit, e-mail, or print, check out Interlocken's 10 Key for iPad."
=================

Specifications:
=================
. Behaves the same as a '10 Key' adding machine.
. Export a PDF file to iBooks©, DropBox©, Email, and print with your favorite printing utility.
. Use Apple AirPrint© to print directly.
. TypeTone - a major innovation to aid accurate key entry using audio feedback (iPad version).
. Full size (1:1) keyboard (iPad version).
. Select from a menu of keypad sounds.
. 400 lines of paper tape history.
. 3 display formats: fixed, fix+, float
. Save paper tapes to disk for later use.
. Correct numbers, add comments, add/delete lines
. Two keypads offer the 'total' key on the left or right (Sharp or Canon style) 
. Comprehensive set of help screens.
. 3 Orientations: Landscape Left/Right + Portrait (iPad version)

================

FAQ's

Q1. What is the difference between 'Adding Machine 10Key Univ', and 'Accountant Calc' in the App. Store.? 
A1. Both calculators are single-column adding machines or calculators with full-size (1:1) keypads and are optimized for the iPad User Interface. '10 Key' behaves the same as a 10 Key Adding Machine with reversed operator entry while ‘Accountant Calc’ supports free chaining of +, -, x, /, %, √, 1/x. It is easier to use if you are not familiar with how a '10-key' works. 

Q2. Can I touch-type?
A2. The iPad version comes as close to touch-typing as a touch-screen can be. With ‘TypeTone’, a key will guide your finger back to the center of a key with an audio tone.

Q3. How can I edit an incorrect number or add & delete lines from the paper tape?
A3. Touch any line of the paper tape for edit mode. Touch the side controls: Add Line, Delete Line. You can also edit numbers, split Add/Sub or Mul/Div groups. Press Done to return to Calculator mode.

Q4. Tell me about Email, Printing, and Exporting a Paper Tape. 
A4. Email includes a pdf attachment. Print requires an AirPrint capable printer. Open-In will cause a menu of 3rd party Apps to appear. Once exported, print directly to a network reachable printer (even if it is NOT AirPrint capable).

============================

TERMS AND CONDITIONS
Your use of this application is governed by Interlocken Technology's Terms of Use (http://s354819480.onlinehome.us/InterlockenPrivacyPolicy/Interlocken%20Technology%20Privacy%20Policy.pdf) and Privacy Policy (http://s354819480.onlinehome.us/InterlockenPrivacyPolicy/InterlockenTechnologyTermsOfUse.pdf)

## Key features

- 10-key adding machine emulation
- Reversed operator entry
- Percentage calculation
- Digital paper tape with editing
- Save and export tapes (PDF)
- TypeTone audio feedback (iPad)

## Chart rankings

- #156 in Top Paid · Finance (US App Store)

## What do users think of Adding Machine 10Key Universal?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🧮 Acts like an adding machine
- 🧾 Digital tape for review
- 🖨️ Can print tape
- 💾 Can save/export results
- ✅ Fix mistakes easily
- 💯 Worth the price
- 💡 Quick help button
- 💰 Good value
- ✨ Revolutionized job
- 🗂️ Keep lists saved
- 👍 Intuitive design
- 💯 Best app
- ✅ Perfect replacement
- 🚀 Efficient for business
- 🌟 Highly recommended
- 👍 Easy to understand
- 💯 Best there is
- ✅ Works perfectly
- 👍 Great in-pocket calculator
- 💡 Running tape is helpful
- ✨ Brilliant concept
- 💯 Absolute favorite
- 🔊 Feedback sound on entry
- 👍 Well done
- 💯 My most used app
- ✅ Simple and clean

**Cons**

- 🐛 Outdated and no support
- 🐛 Doesn't work for new iPad
- 🐛 Total only shows non-zero decimals
- 🐛 Ridiculous method to clear tape
- 🐛 % key not functional
- 🐛 +/- key inoperative
- 🐛 'See index' button does nothing
- 🐛 No iCloud sync
- 🐛 Review pop-up won't go away

**Commonly reported bugs**

- Cannot save taped
- Cannot export results
- Does not work for new iPad
- Total only shows digits after the decimal that aren't zero
- Method to clear the tape is ridiculous
- It does not subtract
- No way to do handoff due to lack of iCloud syncing
- % key does not appear to do anything
- +/- key seems to be inoperative
- See index button doesn't do anything
- Review screen pops up every time the app is opened and 'don't ask again' doesn't work

**Most requested features**

- Add widget
- Add realistic sounds
- Add iCloud sync
- Improve tape clearing method
- Clarify functionality of % and +/- keys
- Improve instructions for less intuitive features

## Recent user reviews (10 of 50)

All indexed reviews: https://appshunter.io/ios/app/adding-machine-10key-universal/id579385939/reviews.md

### 1/5 — outdated and no support

*2026-03-21, version 7.10ku*

could not save taped,nor export results.  Doesn’t work for new iPad

### 5/5 — Manager

*2026-03-14, version 7.10ku*

Very easy to use and it is amazing.

### 5/5 — As close as you can get to an adding machine

*2026-02-12, version 7.10ku*

This App works very well, perfect for balancing your check book and adding long spread sheets.

### 5/5 — Great app

*2026-02-07, version 7.10ku*

This acts just like the old physical 10-key machines. There was a slight learning curve because I haven’t used a 10-key for 20 years or more. But the app works really well. It’s certainly worth the price.

### 4/5 — OK with a couple of annoyances.

*2025-12-10, version 7.10ku*

In fixed+ mode, the total only shows digits after the decimal that aren't zero. Also, on iphone the method to clear the tape is ridiculous.

### 4/5 — Works well except for one thing

*2025-10-17*

The method to clear the tape is ridiculous.

### 5/5 — Adding Machine not a calculator

*2025-09-15, version 7.10ku*

The tape feature makes it easy to check and retain your work. Second, it is an  adding machine. Enter the number then the operation much  easier if you think that way

### 5/5 — Old School

*2025-02-15, version 7.10ku*

Sometimes an old school adding machine is just better than a calculator!

### 5/5 — Great app

*2024-05-26, version 7.10ku*

Use it all the time.

### 5/5 — Best app I have!

*2024-01-31, version 7.10ku*

This app has revolutionized my job!  Easy to use, with a quick help button if you forget. Fix a mistake with ease. Totals each page/section and gives a grand total if needed. Print from my printer!  Can’t say enough!!!

## Frequently asked questions about Adding Machine 10Key Universal

### What is this app?

This app functions as a traditional 10-key adding machine, designed to mimic the experience of physical adding machines from brands like Monroe, Casio, and Sharp. It includes features like reversed operator entry and percentage calculation, along with a digital paper tape for reviewing and editing calculations.

### How can I edit or export my calculations?

You can edit incorrect numbers or add/delete lines by touching any line on the paper tape to enter edit mode. To export, you can send the paper tape as a PDF file via email, save it to iBooks or Dropbox, or print it using a compatible utility or AirPrint.

### Is this app free?

Based on the provided information, this application is a paid app. It does not appear to have in-app purchases or advertisements, indicating a one-time purchase model.

### What devices is this app compatible with?

This is a universal version that works on both iPhone and iPad. The iPad version offers a full-sized keypad and the TypeTone audio aid for enhanced accuracy.

### What is TypeTone?

TypeTone is an audio feedback feature available on the iPad version of the app. It provides a unique sound cue to help guide your finger back to the center of a key, assisting with accurate touch-typing on the screen.

## Version history (last 5 releases)

### 7.10ku — 2023-12-27

v7.10
====
1. Support for iOS 12.4 and newer.

### 6.20ku — 2018-10-29

1. Errata was repaired that repeatedly asked user to 'review this App'.

### 6.14ku — 2018-03-31

Updated for iOS 11.

Includes the following errata fixes:
1. Iphone version:
- screen resizes properly after a phone call
- app scales properly for large format phones

2. iPhone and iPad version:
- 'add-line' edit function was repaired
- total key sound is now different from CE key sound

### 6.12ku — 2018-02-02

Updated for iOS 11.

Includes the following errata fixes:
1. Iphone version:
- screen resizes properly after a phone call
- app scales properly for large format phones

2. iPhone and iPad version:
- 'add-line' edit function was repaired

### 6.11ku — 2018-01-30

Updated for iOS 11.

Includes the following errata fixes:
1. Iphone version:
- screen resizes properly after a phone call

2. iPhone and iPad version:
- 'add-line' edit function was repaired

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## More apps by Richard Silverman

- [Calc For Coders](https://appshunter.io/ios/app/calc-for-coders/id297096640)
- [Calc For Coders Lite](https://appshunter.io/ios/app/calc-for-coders-lite/id306579427)
- [Paper Calc Office](https://appshunter.io/ios/app/paper-calc-office/id328576488)
- [Paper Calc Office Lite](https://appshunter.io/ios/app/paper-calc-office-lite/id347713516)
- [Accountant Calculator](https://appshunter.io/ios/app/accountant-calculator/id374945395)
- [Adding Machine 10Key iPhone](https://appshunter.io/ios/app/adding-machine-10key-iphone/id392883834)

All apps by Richard Silverman: https://appshunter.io/developer/297096643

## Related topics

[adding machine 10key universal](https://appshunter.io/ios/topics/adding-machine-10key-universal) · [adding machine 10key univ lite](https://appshunter.io/ios/topics/adding-machine-10key-univ-lite) · [smart adding machine](https://appshunter.io/ios/topics/smart-adding-machine) · [adding machines](https://appshunter.io/ios/topics/adding-machines) · [adding machine](https://appshunter.io/ios/topics/adding-machine)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-12.*