Comparison

Adding Machine 10Key Univ Lite 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 Univ Lite

This app emulates a traditional 10-key adding machine for precise calculations. It offers features like reversed operator entry, percentage calculation, and the ability to edit and save paper tape files. The iPad version includes a full-size keypad with audio feedback for enhanced accuracy.

Highlights
  • 10-key adding machine emulation
  • Reversed operator entry
  • Percentage calculation
  • Paper tape editing and saving
  • Export paper tape files
  • TypeTone audio feedback (iPad)
Read full description

'Adding Machine 10Key Univ Lite' 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). 'Lite' Version Description ================== This is the full version of Adding Machine 10Key Univ, but with a reduced number of paper tape lines & other limitations. You can find the full version by searching for 'Adding Machine 10Key Universal' by Richard Silverman in the App Store. ==== 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). . Full size (1:1) keyboard (iPad version). . 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. . 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). ============================ INCLUDED IN THIS LITE VERSION: . 16 lines of paper tape history . Limited to 2 keypad sounds . Only save 2 paper histories to disk . Ads for Interlocken products at bottom of display UPGRADE TO THE FULL VERSION IN THE APP STORE 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 Univ Lite4 screens
12Calc4 screens

Verdict

The call

The clearest difference is price: Adding Machine 10Key Univ Lite at Free against 12Calc's $8.99. Adding Machine 10Key Univ Lite also leads on update cadence (every 6 weeks vs every 5 months) and iOS requirement (12.4 vs 17.6). 12Calc's advantage is rating (4.9 vs 4.3) and review sentiment (96% vs 80%). On 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 Univ Lite is free to download; 12Calc costs $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 4.3. Both are backed by a comparable volume of ratings — 192 and 916 respectively. Written reviews point the same way: 80% of Adding Machine 10Key Univ Lite's written reviews are positive against 96% of 12Calc's.

UpkeepUpdate frequency

Adding Machine 10Key Univ Lite ships an update every 6 weeks, 12Calc every 5 months. The most recent releases landed on August 26, 2026 and September 26, 2026 respectively.

Scorecard8 real differences · 3 level
Adding Machine 10Key Univ Lite versus 12Calc: the parameters behind the verdict, then further details
ParameterAdding Machine 10Key Univ Lite12Calc
PriceFree — better$8.99
Rating4.3 (192 ratings)4.9 (916 ratings) — better
Positive reviews79.6% of reviews95.9% of reviews — better
Number of ratings192916 — better
Update frequencyEvery 6 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank—#178 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.4 — better17.6
Further details — not scored
Size23 MB6 MB
Age rating+44+
DeveloperRichard SilvermanErnest Brock

Customer experience

Adding Machine 10Key Univ Lite

All ratings192 ratings
Positive86.5%
Neutral6.3%
Negative7.3%
Written reviews49 reviews
Positive79.6%
Neutral8.2%
Negative12.2%

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 Univ Lite

Reported bugs

4 issues
  • 3 digits get frozen during calculations
  • Crashed and lost data
  • The "don't ask again" button for reviews does nothing
  • App freezes when switching apps

Requested features

8 requests
  • Ability to set automatic cents
  • Two sales tax rates or ability to deselect items from tax
  • More lines in the free version
  • More screen space on iPhone
  • Ability to add more before clearing
Show 3 more
  • Unlimited tape length
  • Dark mode option
  • One-button clear tape option

12Calc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Adding Machine 10Key Univ Lite

No in-app purchases

None

12Calc

No in-app purchases

Questions

Is Adding Machine 10Key Univ Lite free?
Adding Machine 10Key Univ Lite is free to download, with no in-app purchases.
Is 12Calc free?
12Calc costs $8.99, with no in-app purchases.
Which has better reviews, Adding Machine 10Key Univ Lite or 12Calc?
12Calc is rated higher. Adding Machine 10Key Univ Lite averages 4.3 out of 5 from 192 ratings, while 12Calc averages 4.9 from 916 ratings.
Do Adding Machine 10Key Univ Lite or 12Calc have ads?
Neither Adding Machine 10Key Univ Lite nor 12Calc shows ads.
Which is updated more often, Adding Machine 10Key Univ Lite or 12Calc?
Adding Machine 10Key Univ Lite ships an update every 6 weeks, and 12Calc every 5 months. Most recently, Adding Machine 10Key Univ Lite was updated on August 26, 2026 and 12Calc on September 26, 2026.

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