# Adding Machine 10Key iPhone vs Carter Commercial Security

The clearest difference is price: Carter Commercial Security at Free against Adding Machine 10Key iPhone's $2.99. Adding Machine 10Key iPhone's advantage is update cadence (every 5 weeks vs every 14 months) and chart position (#135 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Carter Commercial Security is free to download; Adding Machine 10Key iPhone costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Adding Machine 10Key iPhone ships an update every 5 weeks, Carter Commercial Security every 14 months. The most recent releases landed on October 18, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Adding Machine 10Key iPhone | Carter Commercial Security |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.6 (131 ratings)](https://appshunter.io/ios/app/adding-machine-10key-iphone/id392883834/reviews)** | — |
| Number of ratings | **131** | — |
| Positive reviews | 95.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 14 months |
| Monetization | Free | — |
| Best chart rank | **#135** | — |
| Size | 10 MB | 3 MB |
| Requires iOS | **12.4** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Richard Silverman](https://appshunter.io/developer/297096643) | [Carter Bank & Trust](https://appshunter.io/developer/1201749548) |

## What reviewers say

### Adding Machine 10Key iPhone

[App page](https://appshunter.io/ios/app/adding-machine-10key-iphone/id392883834)

**Currently charting:** #135 Top Paid · Finance (US App Store)

This app emulates a traditional 10-key adding machine, offering reversed operator entry and percentage calculation. Users can edit and save paper tapes, export them to various services, and customize keypad sounds. It's designed for accurate and efficient numerical input.

**Highlights:** True 10-key adding machine emulation, Reversed operator entry, Percentage calculation, Editable paper tape history, Save and retrieve paper tape files, Export paper tape to iBooks, Dropbox, or printing utilities

**In-app purchases:** none

**What reviewers like**

- 👍 Works like a real adding machine
- 👍 Tape feature is excellent
- 👍 Easy to use and user-friendly
- 👍 Good for complex calculations
- 👍 Allows editing of numbers

**What reviewers complain about**

- 🐛 Watermarks premium exports
- 🐛 Haphazardly laid out controls
- 🐛 Touchy sound toggle in free version
- 🐛 Keypad glitch on re-opening
- 🐛 Nagging review requests

**Reported bugs**

- Watermarks premium PDF exports
- Haphazardly laid out controls
- Touchy sound toggle in free version
- Keypad glitch on re-opening
- Nagging review requests (Don't ask again button not working)

**Requested features**

- Eliminate tape for bigger total screen
- Add square root feature
- Bring back custom keypad feature on iPhone version
- Allow more than 350 lines
- Allow more notations on tape


### Carter Commercial Security

[App page](https://appshunter.io/ios/app/carter-commercial-security/id1471008790)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Adding Machine 10Key iPhone free?

Adding Machine 10Key iPhone costs $2.99, with no in-app purchases.

### Is Carter Commercial Security free?

Carter Commercial Security is free to download, with no in-app purchases.

### Do Adding Machine 10Key iPhone or Carter Commercial Security have ads?

Neither Adding Machine 10Key iPhone nor Carter Commercial Security shows ads.

### Which is updated more often, Adding Machine 10Key iPhone or Carter Commercial Security?

Adding Machine 10Key iPhone ships an update every 5 weeks, and Carter Commercial Security every 14 months. Most recently, Adding Machine 10Key iPhone was updated on October 18, 2026 and Carter Commercial Security on October 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*