# A2Calc — SFIC Calculator > A2 SFIC calculator for locksmiths to generate pinning charts and find control keys. (iPhone/iPad app by Farren Domenici.) - Source: https://appshunter.io/ios/app/a2calc/id589583757 (this page in markdown: same URL + `.md`) - Developer: [Farren Domenici](https://appshunter.io/developer/583666476) - Category: Utilities, Productivity - Price: $6.99 - Rating: 4.80/5 from 9 App Store ratings · 15 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 2 MB - Languages: American English - Released: 2013-01-06 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/a2calc/id589583757/reviews.md ## What is A2Calc? A2 Small Format Interchangeable Core Calculator ---Programmed by a Locksmith, for Locksmiths--- Automatically calculates the pinning chart for A2 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 4" (and above) 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. AirPrint or Email projects with a single tap. 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 ## Key features - Automatic pinning chart calculation - Supports 6 or 7 pin systems - Randomize chart generation - Control Finder for lost control keys - Save up to 16 projects - Encrypted and passcode-protected projects - Share projects via AirPrint or email ## Chart rankings - #195 in Top Paid · Utilities (US App Store) ## Recent user reviews (10 of 15) All indexed reviews: https://appshunter.io/ios/app/a2calc/id589583757/reviews.md ### 3/5 — App closes when trying save *2018-12-27* Nice app except for saving pin settings. When it ask to change password app closes and does not save new password. App also closes when trying to input the default password. **Developer response:** Thank you for liking the app but please contact me about bugs directly rather than leaving a mediocre review. I have been recently made aware of this bug from another user and am currently working on a fix. If you can email me what type of iPhone you are using and version of iOS that would be helpful and appreciated. ### 5/5 — No more annoying cut sheets *2018-03-27* Who does math by hand anymore? This app saves you from having to ever fill out a bitting chart again. Quick and easy! ### 5/5 — Awesome app *2017-12-13* This app pays for itself over and over and over. I’ve rekeyed 4 casinos and a airport using this handy app cuts my bitting generation times in half. The control finder is an added bonus in tight situations as well. Thanks Phil! ### 5/5 — Great tool *2017-10-26* I have about all of Phil's apps they are great time savers, I also enjoy the option to email my results. ### 5/5 — Great app *2014-02-09* Great app, it is very well thought out. It's interface/layout/GUI whatever you call it in an app is intuitive and attractive. Works very well, I do not do the math for A2 systems often enough to be fast at it and this app is great in the field. Still the best!! ### 5/5 — Excellent! *2013-12-25* I don't know why it took me so long to think of searching the App Store for locksmith tools, but I'm glad I finally did. This app is fast, effective, and full-featured. I used to do all my SFIC calculations in a web interface tool, which was clunky, and ineffective when no internet was available. This not only works offline, but can do so much more, like calculate an unknown control key easily from the pin stacks in a core. It's easy to use for the basics and advanced features alike. This developer's other apps looks equally as useful. I taught myself long ago to do this stuff in my head, but my brain is fallible and slow, and sometimes just too tired to think. I'm looking forward to much increased efficiency when I'm working in the field. ### 5/5 — Great Job! *2013-07-20, version 1.3* Love it! ### 5/5 — A must have app for Locksmiths! *2013-06-20* I teach the Locksmithing trade for a living to facilities across the country and I promote this app. It's simple to use and effective. I can't wait for the A4calc. ### 5/5 — Awesome *2013-06-11* Cool ### 5/5 — Amazing and useful!! *2013-06-10* Saves our company hours! We knock out the cylinders in an instant. And just transfer to paper once done! Amazing!! ## Frequently asked questions about A2Calc ### What is A2Calc used for? A2Calc is a specialized calculator designed for locksmiths to automatically generate pinning charts for A2 Small Format Interchangeable Core (SFIC) systems. It simplifies the process of determining the correct pin combinations for various keying scenarios. ### How many pin systems does A2Calc support? A2Calc is programmed for both 6 and 7 pin systems. For systems requiring fewer pins, you can use a decimal input to effectively erase a chamber, offering flexibility in its application. ### Can A2Calc help if a control key is lost? Yes, A2Calc includes a 'Control Finder' feature. This bonus tool reverse-engineers a core to help determine the control key's bitting, which is invaluable when multiple cores need to be rekeyed and the original control key is missing. ### How does A2Calc protect my work? All projects saved within A2Calc are encrypted and protected with a passcode. This ensures the confidentiality and security of your sensitive locksmithing data. ### What are the compatibility requirements for A2Calc? A2Calc is compatible with iPhone and iPod touch devices running iOS 8.0 or later, and iPad devices running iOS 12.0 or later. It is designed for mobile locksmith professionals. ### How often is A2Calc updated? The latest version of A2Calc is 1.5.2, last updated on March 12, 2026. While the last update date is in the future, indicating potential future development, users can expect ongoing support and potential improvements. ### What is the price of A2Calc? A2Calc is a paid application, available for $6.99. This one-time purchase grants access to all its features for locksmiths working with A2 SFIC systems. ### Does A2Calc have ads? No, A2Calc does not contain advertisements. As a paid utility app, it provides an uninterrupted user experience focused on its specialized functions for locksmiths. ## Version history (last 5 releases) ### 1.5.2 — 2026-03-12 -Under the hood repairs ### 1.5.1 — 2022-03-03 ---Note: This update requires a minimum version of iOS 12.0--- -Under the hood service to maintain a healthy running app ### 1.5 — 2020-04-28 -Under the hood service to maintain a healthy running app ### 1.4.5 — 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 ### 1.4.4 — 2017-10-18 -Fixed bug that deleted bitting information when printing/emailing ## Apps similar to A2Calc | App | Rating | Price | Category | | --- | --- | --- | --- | | [Black Widow Key Machine](https://appshunter.io/ios/app/black-widow-key-machine/id1577877042) | 4.5 (2) | Free | Utilities | | [Triton PLUS™](https://appshunter.io/ios/app/triton-plus/id6448079864) | 5.0 (5) | Free | Utilities | | [Black Widow Key Machine V2](https://appshunter.io/ios/app/black-widow-key-machine-v2/id1600176672) | 3.0 (2) | Free | Utilities | | [Affiliate Connect](https://appshunter.io/ios/app/affiliate-connect/id1540972233) | 3.5 (16) | Free | Utilities | | [Flipper Mobile App](https://appshunter.io/ios/app/flipper-mobile-app/id1534655259) | 4.5 (269) | Free | Utilities | | [Xhorse](https://appshunter.io/ios/app/xhorse/id1440550587) | 4.3 (162) | Free | Utilities | ## More apps by Farren Domenici - [ServiceCalc](https://appshunter.io/ios/app/servicecalc/id583666473) - [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 ## Related topics [a2calc](https://appshunter.io/ios/topics/a2calc) --- *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 2026-08-24.*