A2Calc vs Centrios
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A2Calc
This app assists locksmiths by automatically calculating pinning charts for A2 SFIC systems. It supports 6 or 7 pin systems and includes features like a randomize function, control finder, and project saving. Projects are encrypted and can be shared via AirPrint or email.
- 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
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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
Centrios
Manage business access remotely with a smart lock system. Control locks, grant temporary access to staff and visitors, and monitor activity logs. Ideal for businesses needing secure and flexible entry management.
- Unlock and lock doors remotely
- Grant access to staff and visitors
- Create and edit access schedules
- View activity and access history
- Manage multiple locations
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Centrios is a smart access platform designed specifically for small and growing businesses just like yours. With our intuitive and easy-to-use app, you can connect your Centrios smart locks and smart readers to your business in the matter of seconds. With the Centrios app, you can: Unlock and lock your locks with the touch of your mobile phone. Grant access to staff and visitors to multiple devices. Create and edit access schedules. View recent activities including access history, low battery reports, and more. View system details including subscription level and user capacities. Manage and access multiple locations with a single sign on. Get started today!
Screenshots
Verdict
The clearest difference is price: Centrios at Free against A2Calc's $6.99. Centrios also leads on update cadence (every 6 weeks vs every 3 months). A2Calc's advantage is ads (none vs shown) and rating (4.8 vs 4.4). On review sentiment, ratings volume, in-app purchases 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
Centrios is free to download; A2Calc costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
A2Calc holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 9 and 14 respectively. Written reviews point the same way: 93% of A2Calc's written reviews are positive against 90% of Centrios's.
A2Calc ships an update every 3 months, Centrios every 6 weeks. The most recent releases landed on September 8, 2026 and July 30, 2026 respectively.
| Parameter | A2Calc | Centrios |
|---|---|---|
| Price | $6.99 | Free — better |
| Rating | 4.8 (9 ratings) — better | 4.4 (14 ratings) |
| Positive reviews | 93.3% of reviews — better | 90.5% of reviews |
| Number of ratings | 9 | 14 — better |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 2 MB | 371 MB |
| Age rating | 4+ | 4+ |
| Developer | Farren Domenici | Assa Abloy Of Canada Ltd |
Customer experience
A2Calc
Centrios
In-app purchases
A2Calc
No in-app purchases
Centrios
No in-app purchases









