# A4Calc — SFIC Calculator

> SFIC Calculator (iPhone/iPad app by Farren Domenici.)

- Source: https://appshunter.io/ios/app/a4calc/id734140182 (this page in markdown: same URL + `.md`)
- Developer: [Farren Domenici](https://appshunter.io/developer/583666476)
- Category: Utilities, Productivity
- Price: $4.99
- Age rating: 4+
- Requires: iOS 12.0 · 2 MB
- Languages: American English
- Released: 2013-11-12
- Data updated: 2026-08-10
- User reviews in markdown: https://appshunter.io/ios/app/a4calc/id734140182/reviews.md

## What is A4Calc?

A4 Small Format Interchangeable Core Calculator
(sister app of A2Calc and A3Calc)

---Programmed by a Locksmith, for Locksmiths---
Automatically calculates the pinning chart for A4 SFIC. Built for 6 or 7 pin systems, however, less can be achieved by using a decimal to erase a chamber.

Minimum of a control and master key are required to make a chart. Additional change key available for all devices; 2 change keys available for 16:9 screen devices.

Randomize function will generate completely random charts each time it is triggered.

"Lock/Unlock" toggle disables/enables all inputs and functions to prevent unwanted/lost changes.

Control Finder is an added bonus by reverse engineering a core to determine the control key's bitting. This is perfect when needing to remove multiple cores in a building when the control key has been lost. There are two methods for achieving the control key: 1. using the master, control, and bottom pins, or 2. using only the top/driver pins.

Up to 16 different projects can be saved at any one given time.

All projects are encrypted and protected with a passcode when stored on your device.

All projects can be exported via AirPrint and Email.

Compatibility: iPhone / iPod touch on iOS 8.0 or later and iPad on iOS 12.0 or later.

Found a bug? Something not working? Have a suggestion? Feel free to contact me via email: farren@phoxlocks.com

## Chart rankings

- #189 in Top Paid · Utilities (US App Store)


## Version history (last 5 releases)

### 1.2.3 — 2026-03-11

-Under the hood repairs

### 1.2.2 — 2022-03-03

---Note: This update requires a minimum version of iOS 12.0---

-Under the hood service to maintain a healthy running app

### 1.2.1 — 2020-04-28

-Fixed a display issue

### 1.2 — 2020-04-22

-Under the hood service to maintain a healthy running app

### 1.1.5 — 2019-02-23

---Note: This update requires a minimum version of iOS 8.0---

-Fixed bug that caused app to crash after changing and using passcode. Saved projects will remain intact however the passcode will be reverted back to the default 1234 which can be immediately changed.

-Under the hood improvements and repairs

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| [Maverick Key Cutting Machine](https://appshunter.io/ios/app/maverick-key-cutting-machine/id6748011881) | — | Free | Utilities |
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## More apps by Farren Domenici

- [ServiceCalc](https://appshunter.io/ios/app/servicecalc/id583666473)
- [A2Calc](https://appshunter.io/ios/app/a2calc/id589583757)
- [LFIC](https://appshunter.io/ios/app/lfic/id595870826)
- [Master It](https://appshunter.io/ios/app/master-it/id645920825)
- [Biaxial](https://appshunter.io/ios/app/biaxial/id658649763)
- [Dialnostics](https://appshunter.io/ios/app/dialnostics/id662583874)

All apps by Farren Domenici: https://appshunter.io/developer/583666476

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-10.*