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67
BU Score
Solid

Adding Machine 10Key Universal

4.7 ✍️ Editor
✍️ BU Analytics Review

Adding Machine 10Key Universal is an iOS app from Richard Silverman in the Finance category, currently rated 4.7★ across 132 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.

Our BU Score puts it at 67Solid (established niche player). For a Finance app, that means established niche player.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

📊 Performance Tracking LIVE

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idle
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Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 7 of 7 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Paid app ($0.00)METRIC
+$2,800
Excellent rating (4.7★)METRIC
+$2,200
worth every pennyREVIEW
+$2,000
Mature app (13y old)METRIC
+$1,500
highly recommendREVIEW
+$1,400
Localized (5 languages)METRIC
+$600
Early-stage install base (132 ratings)METRIC
+$400
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
May 24
Feb 25
Sep 25
Dec 25
Feb 26

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 23 MB🔞 4+📱 iOS 12.4+🔖 v7.10ku🔄 updated 2y ago🌐 EN, FR, DE, IT, ES📂 Finance💰 Paid🚀 Launched 2012 (13y old)

📝 About this app

'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)

🆕 What's New · v7.10ku

v7.10
====
1. Support for iOS 12.4 and newer.

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Adding Machine 10Key Universal
Developer
Richard Silverman
Bundle ID
com.papercalc-mobile.papercalc-10Key-universal-suite
App Store URL
Open in App Store
Category
Finance
Content rating
4+
Languages
EN, FR, DE, IT, ES

Company

Website
Not found
Tagline
Today
Description
Find apps and games for iPhone, iPad, Mac, and more on the App Store.
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
OG image

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$20.0K/mo
Top-grossing rank
Outside top 100 in US Finance
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
https://apps.apple.com/us/app/letterloop-group-newsletters/id6468623700
Press / News
Not found

Contacts & Socials

Socials
Not found
Email
Not found
Phone
Not found
Contact page
Not found
About page
https://apps.apple.com/us/iphone/story/id1884836200
📈Ratings growth132 ratings+13100% lifetimeShow 3-year history estimate ▾Dec 2012Sep 2023May 2026
Tracked (42 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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