Comparison

Adding Machine 10Key iPhone vs 12Calc

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

Head to head
About

Adding Machine 10Key iPhone

This app emulates a traditional 10-key adding machine, offering reversed operator entry and percentage calculation. Users can edit and save paper tapes, export them to various services, and customize keypad sounds. It's designed for accurate and efficient numerical input.

Highlights
  • True 10-key adding machine emulation
  • Reversed operator entry
  • Percentage calculation
  • Editable paper tape history
  • Save and retrieve paper tape files
  • Export paper tape to iBooks, Dropbox, or printing utilities
Currently charting
Read full description

'Adding Machine 10Key for iPhone’ 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. The total (*) key can be on either the left or right side (Sharp or Canon style) and the keypad is expandable to show more or less paper tape history. 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, or your favorite printing utility. . TypeTone - a major innovation to aid accurate key entry using audio feedback (iPad version only). . Full size (1:1) keyboard (iPad version only). . Select from a menu of keypad sounds. . 400 lines of paper tape history (full version). . 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. ================ 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. Only the iPad version includes ‘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)

About

12Calc

This app provides a full-featured financial calculator experience, replicating the functionality of a popular physical model. It offers an audit tape for tracking calculations, a unit converter with currency exchange rates, and various worksheets with interactive graphs for financial analysis. Optimized for modern devices with high-resolution graphics and support for multiple orientations.

Highlights
  • HP12C emulation
  • Audit tape for calculation history
  • Unit and currency converter
  • Interactive financial worksheets
  • Portrait and landscape views
  • Contextual help and tutorials
  • HD graphics with color themes
Features
Currently charting
Read full description

12Calc is a full version of the well known HP12C for the iPhone and iPad. It also includes an audit tape, unit converter, worksheets, rotated views, user guide and HD graphics optimized for iPad and iPhone retina displays. •Runs in 64 bit mode on the latest iOS release and new iPads and iPhones. •Calculations are highly accurate and blazing fast. No more "running" flashing displays for amortizations, depreciation schedules or interest calculations. Work as fast as you can type. •Audit Tape: The audit tape keeps a record of your calculations. You can review, mail, text, share or print the tape. •Unit Converter: Convert between a wide variety of common units and currencies. Currency rates can be downloaded from the internet. •Work Sheets with interactive graphs: Auto Purchase Black-Scholes Bond Break-even Cash Flow analysis Currency Date Depreciation Interest Conversion Lease Loan Amortization (includes option for Canadian mortgages) Margin&Markup Refinance Statistics Tip TVM •Views for all orientations: Portrait and landscape renderings of the full keyboard are provided for iPhone and iPad. The iPad version includes slide over and multiple split view displays as well as side-by-side display of the help page, audit tape, tvm mortgage table or program variables. •Built-in contextual help: Touch the ? key for a description of any keyboard function with examples of use. If you are just learning or can't remember how to use a function- just touch the ? key. Includes tutorials on how to use reverse Polish notation (RPN) and how to solve time value of money problems. •HD Graphics: Graphics optimized for both retina and standard resolution screens. Choose from multiple color schemes including gold, rose gold, brass, copper, silver and several color tints.

Screenshots

Adding Machine 10Key iPhone4 screens
12Calc4 screens

Verdict

The call

The clearest difference is price: Adding Machine 10Key iPhone at $2.99 against 12Calc's $8.99. Adding Machine 10Key iPhone also leads on update cadence (every 5 weeks vs every 5 months) and chart position (#49 vs #183). 12Calc's advantage is rating (4.9 vs 4.6) and ratings volume (916 vs 130). On review sentiment, ads, in-app purchases and device support 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

Adding Machine 10Key iPhone costs $2.99 and 12Calc $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

12Calc holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: 12Calc has 916 ratings behind it against 130, so its average is the more settled of the two. Written reviews split almost evenly too, at 95% and 96% positive.

UpkeepUpdate frequency

Adding Machine 10Key iPhone ships an update every 5 weeks, 12Calc every 5 months. The most recent releases landed on September 22, 2026 and September 25, 2026 respectively.

Scorecard7 real differences · 4 level
Adding Machine 10Key iPhone versus 12Calc: the parameters behind the verdict, then further details
ParameterAdding Machine 10Key iPhone12Calc
Price$2.99 — better$8.99
Rating4.6 (130 ratings)4.9 (916 ratings) — better
Positive reviews95.2% of reviews95.9% of reviews — better
Number of ratings130916 — better
Update frequencyEvery 5 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank#49 — better#183
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.4 — better17.6
Further details — not scored
Size10 MB6 MB
Age rating4+4+
DeveloperRichard SilvermanErnest Brock

Customer experience

Adding Machine 10Key iPhone

All ratings130 ratings
Positive92.3%
Neutral3.1%
Negative4.6%
Written reviews62 reviews
Positive95.2%
Neutral0.0%
Negative4.8%

12Calc

All ratings916 ratings
Positive98.3%
Neutral1.1%
Negative0.7%
Written reviews197 reviews
Positive95.9%
Neutral1.5%
Negative2.5%

Bugs and requests

Adding Machine 10Key iPhone

Reported bugs

9 issues
  • Watermarks premium PDF exports
  • Haphazardly laid out controls
  • Touchy sound toggle in free version
  • Keypad glitch on re-opening
  • Nagging review requests (Don't ask again button not working)
Show 4 more
  • Incessant review requests (Don't Ask Again option not working)
  • Clearing the tape is a guessing exercise (I button behavior inconsistent)
  • Custom keypad feature removed from iPhone version
  • Inconsistent sound and clear button behavior

Requested features

10 requests
  • Eliminate tape for bigger total screen
  • Add square root feature
  • Bring back custom keypad feature on iPhone version
  • Allow more than 350 lines
  • Allow more notations on tape
Show 5 more
  • Ability to custom label groups
  • Fix period button centering
  • Consider changing app icon
  • Preferences for number format (input and output commas)
  • More control over number formats

12Calc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Adding Machine 10Key iPhone

No in-app purchases

None

12Calc

No in-app purchases

Questions

Is Adding Machine 10Key iPhone free?
Adding Machine 10Key iPhone costs $2.99, with no in-app purchases.
Is 12Calc free?
12Calc costs $8.99, with no in-app purchases.
Which has better reviews, Adding Machine 10Key iPhone or 12Calc?
12Calc is rated higher. Adding Machine 10Key iPhone averages 4.6 out of 5 from 130 ratings, while 12Calc averages 4.9 from 916 ratings.
Do Adding Machine 10Key iPhone or 12Calc have ads?
Neither Adding Machine 10Key iPhone nor 12Calc shows ads.
Which is updated more often, Adding Machine 10Key iPhone or 12Calc?
Adding Machine 10Key iPhone ships an update every 5 weeks, and 12Calc every 5 months. Most recently, Adding Machine 10Key iPhone was updated on September 22, 2026 and 12Calc on September 25, 2026.
Which is more popular, Adding Machine 10Key iPhone or 12Calc?
Adding Machine 10Key iPhone currently peaks at #49 in the App Store charts, and 12Calc at #183. Chart position reflects recent download velocity rather than total install base.

Other comparisons