Comparison

Adding Machine 10Key Univ Lite vs Calculator X

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

Calculator X

This app offers a smart calculator experience across iPad, iPhone, and Apple Watch. It features a history of calculations, the ability to edit equations, and a convenient dark mode. Easily share your results and enjoy enhanced productivity with its user-friendly interface.

Highlights
  • Basic & Easy to Use
  • History of Calculations
  • Edit Equation
  • Memory Last Calculation
  • Dark Mode
  • Drag and Drop
  • Split View
Features
Read full description

Calculator app for iPad, iPhone and Apple Watch is a free app with extended features that increases your productivity! Download now and join the club of users impressed by the product! WHY YOU’LL LOVE CALCULATOR • Basic & Easy to Use Calculator app on iPad, iPhone and Apple Watch • History of Calculations: Save, Copy & Share • Edit Equation • Memory Last Calculation • Dark Mode • iPad, iPhone and Apple Watch Support • Drag and Drop • Split View EDIT EQUATION DURING CALCULATION You can edit numbers anytime during calculation process. DARK MODE Switch to Dark mode and enjoy the design! The dark mode protects eyes from bright colors, saves battery power and helps you focusing better. SHARE YOUR CALCULATIONS Having a great result with your calculation? Save time and send to your contacts fast & simple by sharing with calculator. WE LOVE FEEDBACK We always appreciate your feedback. Please keep sharing your experience, bugs and ideas to calculator.feedback@otrofy.com Enjoying Calculator and want more features? Please show us some love by giving a 5 star review, so we can keep updating with great new features! START CALCULATING TODAY Terms of Use: https://otrofy.com/terms.pdf Privacy Policy: http://otrofy.com/calculator-privacy.pdf

Screenshots

Adding Machine 10Key Univ Lite4 screens
Calculator X4 screens

Verdict

The call

The clearest difference is in-app purchases: Adding Machine 10Key Univ Lite at none against Calculator X's 2. Adding Machine 10Key Univ Lite also leads on ads (none vs shown) and iOS requirement (12.4 vs 14.0). Calculator X's advantage is rating (4.6 vs 4.3) and ratings volume (6.2K vs 192). On price, review sentiment 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

Both are free to download. Calculator X sells 2 in-app purchases, starting at $9.99 per 6 months. Adding Machine 10Key Univ Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Calculator X holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Calculator X has 6.2K ratings behind it against 192, so its average is the more settled of the two. Written reviews complicate that: 80% of Adding Machine 10Key Univ Lite's written reviews are positive against 76% of Calculator X's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Adding Machine 10Key Univ Lite ships an update every 6 weeks, Calculator X every 3 weeks. The most recent releases landed on October 22, 2026 and October 26, 2026 respectively.

Scorecard7 real differences · 3 level
Adding Machine 10Key Univ Lite versus Calculator X: the parameters behind the verdict, then further details
ParameterAdding Machine 10Key Univ LiteCalculator X
PriceFreeFree
Rating4.3 (192 ratings)4.6 (6.2K ratings) — better
Positive reviews79.6% of reviews — better76.2% of reviews
Number of ratings1926.2K — better
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS12.4 — better14.0
Further details — not scored
Size23 MB188 MB
Age rating4+4+
DeveloperRichard SilvermanOtrofy Inc.

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%

Calculator X

All ratings6,244 ratings
Positive90.4%
Neutral3.9%
Negative5.7%
Written reviews185 reviews
Positive76.2%
Neutral7.6%
Negative16.2%

User reviews

Adding Machine 10Key Univ Lite

From 192 App Store ratings

What we love

  • 👍 Easy to use
  • 👍 Works like a real adding machine
  • 👍 Tape feature is useful
  • 👍 Large, clear numbers
  • 👍 Good for bookkeeping

Room to improve

  • 💸 Paid version is expensive
  • 📉 Ads take up screen space on iPhone
  • 🤏 Keys are too small on lite version
  • 🗄️ Lite version has limited lines
  • 💡 Trailing zeros not displayed

Calculator X

From 6.2K App Store ratings

What we love

  • 👍 Simple and basic calculator
  • 💜 Beautiful color themes
  • 🔒 No ads
  • 💾 Calculation history
  • 🔍 Easy to use

Room to improve

  • 🐛 Occasional bugs and glitches
  • 💰 Paywall/tokens required to use
  • 🖍️ Limited color options
  • 🔢 Only supports up to 9 digits
  • 🧮 No scientific calculator functions

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

Calculator X

Reported bugs

3 issues
  • Calculation history clearing issues
  • Dark mode not working properly
  • Compatibility problems on older devices

Requested features

4 requests
  • More color theme options
  • Ability to edit/restore calculation history
  • Percentage and scientific calculator functions
  • Customizable fonts and layouts

In-app purchases

None

Adding Machine 10Key Univ Lite

No in-app purchases

2 purchases

Calculator X

Subscriptions1
  • Calculator Premium1 Month trial$9.996 Months
One-time1
  • Gold Support$6.99

Questions

Is Adding Machine 10Key Univ Lite free?
Adding Machine 10Key Univ Lite is free to download, with no in-app purchases.
Is Calculator X free?
Calculator X is free to download, with in-app purchases available.
Which has better reviews, Adding Machine 10Key Univ Lite or Calculator X?
Calculator X is rated higher. Adding Machine 10Key Univ Lite averages 4.3 out of 5 from 192 ratings, while Calculator X averages 4.6 from 6.2K ratings.
Do Adding Machine 10Key Univ Lite or Calculator X have ads?
Calculator X shows ads; Adding Machine 10Key Univ Lite does not.
Which is updated more often, Adding Machine 10Key Univ Lite or Calculator X?
Adding Machine 10Key Univ Lite ships an update every 6 weeks, and Calculator X every 3 weeks. Most recently, Adding Machine 10Key Univ Lite was updated on October 22, 2026 and Calculator X on October 26, 2026.

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