Comparison

Adding Machine 10Key Universal vs Compound Interest Calc

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 Universal

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 review and edit entries on a digital paper tape. Users can save, export, and print their calculation tapes.

Highlights
  • 10-key adding machine emulation
  • Reversed operator entry
  • Percentage calculation
  • Digital paper tape with editing
  • Save and export tapes (PDF)
  • TypeTone audio feedback (iPad)
Currently charting
Read full description

'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)

About

Compound Interest Calc

Plan your financial future with a powerful compound interest calculator. It helps you visualize investment growth with periodic contributions and plan retirement withdrawals with inflation adjustments. Offers detailed breakdowns and interactive charts for informed financial decisions.

Highlights
  • Calculate investment growth with contributions
  • Plan retirement withdrawals with inflation
  • Interactive growth and depletion charts
  • Year-by-year detailed breakdowns
  • Real-time calculations
  • Works offline
Features
Read full description

Compound Interest Calculator - Your Financial Planning Companion Plan your financial future with precision using our powerful compound interest calculator. Whether you're saving for retirement or planning investment growth, this app provides the tools you need. KEY FEATURES: Growth Mode • Calculate investment growth with periodic contributions • See how your money grows over time • Adjust contribution frequency (Yearly, Quarterly, Monthly, Weekly) • View detailed year-by-year breakdowns • Visualize growth with interactive charts Withdrawal Mode • Plan retirement withdrawals with inflation adjustments • Calculate how long your savings will last • Account for inflation in your planning • See time to zero calculations • Understand total withdrawal amounts Powerful Visualizations • Interactive line charts showing growth or depletion • Year-by-year tables with detailed breakdowns • Easy-to-read currency formatting • Touch points on charts to see exact values Beautiful Material Design • Clean, modern interface • Smooth animations and transitions • Intuitive navigation • Accessible design for all users Smart Features • Real-time calculations as you type • Input validation to prevent errors • Handles edge cases gracefully • Optimized for performance • Works offline - no internet required PERFECT FOR: • Retirement planning • Investment strategy • Savings goals • Financial education • Wealth building GROWTH MODE CALCULATIONS: Enter your starting balance, expected annual return rate, investment duration, and periodic contributions. The app calculates your final investment value, total contributions, and profit using the compound interest formula. WITHDRAWAL MODE CALCULATIONS: Plan your retirement by entering your starting balance, expected return rate, withdrawal amount, and inflation rate. See how long your money will last and plan accordingly. WHY CHOOSE THIS CALCULATOR? • Accurate compound interest formulas • Beautiful, easy-to-use interface • Fast and responsive Whether you're a financial professional, student, or someone planning for the future, this calculator provides the insights you need to make informed decisions. Download now and take control of your financial future! --- Note: This calculator is for educational and planning purposes. Actual investment returns may vary. Consult with a financial advisor for personalized advice.

Screenshots

Adding Machine 10Key Universal4 screens
Compound Interest Calc4 screens

Verdict

The call

The clearest difference is price: Compound Interest Calc at Free against Adding Machine 10Key Universal's $3.99. Compound Interest Calc also leads on ratings volume (6.5K vs 134). Adding Machine 10Key Universal's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, update cadence 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

Compound Interest Calc is free to download; Adding Machine 10Key Universal costs $3.99 up front. Compound Interest Calc sells 1 one-off in-app purchase. Adding Machine 10Key Universal asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Adding Machine 10Key Universal against 4.8 for Compound Interest Calc. That said, the two scores are not equally well evidenced: Compound Interest Calc has 6.5K ratings behind it against 134, so its average is the more settled of the two. Written reviews are what separate them: 94% of Adding Machine 10Key Universal's written reviews are positive against 69% of Compound Interest Calc's.

UpkeepUpdate frequency

Adding Machine 10Key Universal ships an update every 2 months, Compound Interest Calc every 3 months. The most recent releases landed on September 26, 2026 and September 23, 2026 respectively.

Scorecard8 real differences · 3 level
Adding Machine 10Key Universal versus Compound Interest Calc: the parameters behind the verdict, then further details
ParameterAdding Machine 10Key UniversalCompound Interest Calc
Price$3.99Free — better
Rating4.7 (134 ratings)4.8 (6.5K ratings) — better
Positive reviews94.0% of reviews — better68.6% of reviews
Number of ratings1346.5K — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#200 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.4 — better15.6
Further details — not scored
Size23 MB16 MB
Age rating4+4+
DeveloperRichard SilvermanDane Hankamer

Customer experience

Adding Machine 10Key Universal

All ratings134 ratings
Positive92.5%
Neutral1.5%
Negative6.0%
Written reviews50 reviews
Positive94.0%
Neutral0.0%
Negative6.0%

Compound Interest Calc

All ratings6,530 ratings
Positive95.8%
Neutral1.8%
Negative2.3%
Written reviews153 reviews
Positive68.6%
Neutral7.8%
Negative23.5%

User reviews

Adding Machine 10Key Universal

From 134 App Store ratings

What we love

  • 👍 Easy to use
  • 🧮 Acts like an adding machine
  • 🧾 Digital tape for review
  • 🖨️ Can print tape
  • 💾 Can save/export results

Room to improve

  • 🐛 Outdated and no support
  • 🐛 Doesn't work for new iPad
  • 🐛 Total only shows non-zero decimals
  • 🐛 Ridiculous method to clear tape
  • 🐛 % key not functional

Compound Interest Calc

From 6.5K App Store ratings

What we love

  • 🚀 Easy to use
  • 🚀 Visually appealing
  • 🚀 Helpful for financial planning
  • 🚀 Powerful compound interest calculations
  • 🚀 Intuitive interface

Room to improve

  • 🐛 Scaling issues on smaller devices
  • 🐛 Inaccurate calculations in certain scenarios
  • 🐛 Frequent ads disrupting user experience
  • 🐛 Crashing and compatibility issues
  • 🐛 Lack of customization options

Bugs and requests

Adding Machine 10Key Universal

Reported bugs

11 issues
  • 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
Show 6 more
  • 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

Requested features

6 requests
  • Add widget
  • Add realistic sounds
  • Add iCloud sync
  • Improve tape clearing method
  • Clarify functionality of % and +/- keys
Show 1 more
  • Improve instructions for less intuitive features

Compound Interest Calc

Reported bugs

4 issues
  • Withdrawal calculations showing incorrect results
  • App crashing on certain device models
  • Scaling issues on iPad devices
  • Compound interest calculations not accurate for weekly/monthly contributions

Requested features

5 requests
  • Add dividend calculation option
  • Allow for daily compound interest calculations
  • Implement a save/load feature to retain user inputs
  • Add ability to input one-time lump sum contributions
  • Provide inflation-adjusted withdrawal calculations

In-app purchases

None

Adding Machine 10Key Universal

No in-app purchases

1 purchases

Compound Interest Calc

One-time1
  • Remove Ads$1.99

Questions

Is Adding Machine 10Key Universal free?
Adding Machine 10Key Universal costs $3.99, with no in-app purchases.
Is Compound Interest Calc free?
Compound Interest Calc is free to download, with in-app purchases available.
Which has better reviews, Adding Machine 10Key Universal or Compound Interest Calc?
Compound Interest Calc is rated higher. Adding Machine 10Key Universal averages 4.7 out of 5 from 134 ratings, while Compound Interest Calc averages 4.8 from 6.5K ratings.
Do Adding Machine 10Key Universal or Compound Interest Calc have ads?
Compound Interest Calc shows ads; Adding Machine 10Key Universal does not.
Which is updated more often, Adding Machine 10Key Universal or Compound Interest Calc?
Adding Machine 10Key Universal ships an update every 2 months, and Compound Interest Calc every 3 months. Most recently, Adding Machine 10Key Universal was updated on September 26, 2026 and Compound Interest Calc on September 23, 2026.

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