# A2Calc vs Centrios

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.

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.

## The numbers

| Metric | A2Calc | Centrios |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/a2calc/id589583757/reviews)** | [4.4 (14 ratings)](https://appshunter.io/ios/app/centrios/id6449100322/reviews) |
| Number of ratings | 9 | **14** |
| Positive reviews | **93.3% of reviews** | 90.5% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Paid | **Ad-supported** |
| Size | 2 MB | 371 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Farren Domenici](https://appshunter.io/developer/583666476) | [Assa Abloy Of Canada Ltd](https://appshunter.io/developer/1687705830) |

## What reviewers say

### A2Calc

[App page](https://appshunter.io/ios/app/a2calc/id589583757)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Centrios

[App page](https://appshunter.io/ios/app/centrios/id6449100322)

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.

**Highlights:** Unlock and lock doors remotely, Grant access to staff and visitors, Create and edit access schedules, View activity and access history, Manage multiple locations

**In-app purchases:** none


## Frequently asked questions

### Is A2Calc free?

A2Calc costs $6.99, with no in-app purchases.

### Is Centrios free?

Centrios is free to download, with no in-app purchases.

### Which has better reviews, A2Calc or Centrios?

A2Calc is rated higher. A2Calc averages 4.8 out of 5 from 9 ratings, while Centrios averages 4.4 from 14 ratings.

### Do A2Calc or Centrios have ads?

Centrios shows ads; A2Calc does not.

### Which is updated more often, A2Calc or Centrios?

A2Calc ships an update every 3 months, and Centrios every 6 weeks. Most recently, A2Calc was updated on September 8, 2026 and Centrios on July 30, 2026.

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