Comparison

Nice Calc vs Adding Machine 10Key Universal

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

Head to head
About

Nice Calc

This app calculates percentages and taxes with a single touch. It allows users to customize the interface with different skins and offers a premium version with a currency converter and dual calculator functionality.

Highlights
  • Calculate percentage and tax with one touch
  • View tax already added
  • Change interface skins
  • Currency converter (premium)
  • Dual calculator (premium)
  • Share results
Features
Read full description

Nice Calc is the calculator that does the multi-step math for you — with just one tap. The T key, programmed by you Set the T key to whatever percentage you use most (tip, commission, tax, anything). After entering any number, tap it and instantly see the full breakdown: the original amount, the percentage applied, and the total — all in a single tap. Price before tax, instantly Already includes tax in the price? Tap ÷ followed by T and Nice Calc shows you the original price in detail, no need to work out the reverse math by hand. Add or subtract any percentage Not just the one you set on T — you can also add or subtract any percentage you need on the spot, right from the keypad. Choose how your operations are calculated Decide whether Nice Calc follows standard mathematical precedence (multiplication and division before addition and subtraction) or calculates everything in the exact order you typed it — you're in control. Premium Collection Inside In-App Purchases, unlock: - Skins and themes — Customize the look of Nice Calc with different designs, so it looks exactly how you want. - Currency converter — With more than 20 currencies from around the world. Choose your source and target currency, do your calculations as usual, and when you tap "=" the result converts automatically. - Dual calculator in landscape — Rotate your iPhone and get two independent calculators, side by side. Work in both at the same time and send the result from one to the other whenever you need to. Simple on the outside, powerful on the inside. Nice Calc does in one tap what other calculators take several steps to do.

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)

Screenshots

Nice Calc4 screens
Adding Machine 10Key Universal4 screens

Verdict

The call

Nice Calc and Adding Machine 10Key Universal both sit at 4.8 stars, but that hides the real split: 94% of Adding Machine 10Key Universal's written reviews are positive against 44% of Nice Calc's. Adding Machine 10Key Universal also leads on in-app purchases (none vs 1) and chart position (#155 vs unranked). Nice Calc's advantage is price (Free vs $3.99) and update cadence (every 2 weeks vs every 2 months). On rating, ads 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

Nice Calc is free to download; Adding Machine 10Key Universal costs $3.99 up front. Nice 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 — 4.8 for Nice Calc against 4.7 for Adding Machine 10Key Universal. Both are backed by a comparable volume of ratings — 457 and 134 respectively. Written reviews are what separate them: 44% of Nice Calc's written reviews are positive against 94% of Adding Machine 10Key Universal's.

UpkeepUpdate frequency

Nice Calc ships an update every 2 weeks, Adding Machine 10Key Universal every 2 months. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

Scorecard8 real differences · 3 level
Nice Calc versus Adding Machine 10Key Universal: the parameters behind the verdict, then further details
ParameterNice CalcAdding Machine 10Key Universal
PriceFree — better$3.99
Rating4.8 (457 ratings) — better4.7 (134 ratings)
Positive reviews44.4% of reviews94.0% of reviews — better
Number of ratings457 — better134
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#155 — better
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS17.612.4 — better
Further details — not scored
Size11 MB23 MB
Age rating4+4+
DeveloperChepe NicoliRichard Silverman

Customer experience

Nice Calc

All ratings457 ratings
Positive94.3%
Neutral3.1%
Negative2.6%
Written reviews54 reviews
Positive44.4%
Neutral11.1%
Negative44.4%

Adding Machine 10Key Universal

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

User reviews

Nice Calc

From 457 App Store ratings

What we love

  • 👍 Easy to use and intuitive interface
  • 💡 Dual calculator feature (side-by-side on iPad)
  • 🔢 Clear display of all numbers and calculations
  • ⚙️ Useful tax calculation key
  • 📊 Percentage calculation functionality

Room to improve

  • 🐛 App crashes frequently on launch
  • 🐛 App closes unexpectedly during use
  • 💸 Removed features now require paid upgrade
  • 😞 Poor customer support and feedback channels
  • 🔢 Incorrect calculation results

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

Bugs and requests

Nice Calc

Reported bugs

8 issues
  • Division function produces incorrect results
  • Multiplication calculations fail or produce wrong answers
  • App crashes when sound is set to zero
  • Black screen with numbers displayed
  • Crashes on divide key press
Show 3 more
  • Order of operations not calculated correctly
  • App won't open after updates
  • Dual calculator functionality lost after updates

Requested features

8 requests
  • Memory buttons for calculations
  • Full-screen option for iPad mini
  • Dollar sign currency formatting
  • Keyboard click sound effects
  • Number formatting with commas for readability
Show 3 more
  • More decimal place options
  • Landscape mode support
  • Laptop/desktop version

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

In-app purchases

1 purchases

Nice Calc

One-time1
  • Premium Collection$2.99
None

Adding Machine 10Key Universal

No in-app purchases

Questions

Is Nice Calc free?
Nice Calc is free to download, with in-app purchases available.
Is Adding Machine 10Key Universal free?
Adding Machine 10Key Universal costs $3.99, with no in-app purchases.
Which has better reviews, Nice Calc or Adding Machine 10Key Universal?
Nice Calc is rated higher. Nice Calc averages 4.8 out of 5 from 457 ratings, while Adding Machine 10Key Universal averages 4.7 from 134 ratings.
Do Nice Calc or Adding Machine 10Key Universal have ads?
Neither Nice Calc nor Adding Machine 10Key Universal shows ads.
Which is updated more often, Nice Calc or Adding Machine 10Key Universal?
Nice Calc ships an update every 2 weeks, and Adding Machine 10Key Universal every 2 months. Most recently, Nice Calc was updated on October 7, 2026 and Adding Machine 10Key Universal on October 9, 2026.

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