# MobileKey vs Construction Calculator A1

The clearest difference is rating: Construction Calculator A1 at 4.7 against MobileKey's 1.0. Construction Calculator A1 also leads on review sentiment (67% vs 32%) and ratings volume (29 vs 1). MobileKey's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Construction Calculator A1 holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Construction Calculator A1 has 29 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 32% of MobileKey's written reviews are positive against 67% of Construction Calculator A1's.

MobileKey ships an update every 3 months, Construction Calculator A1 every 4 weeks. The most recent releases landed on October 21, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | MobileKey | Construction Calculator A1 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/mobilekey/id1231074427/reviews) | **[4.7 (29 ratings)](https://appshunter.io/ios/app/construction-calculator-a1/id1589484051/reviews)** |
| Number of ratings | 1 | **29** |
| Positive reviews | 32.3% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 49 MB | 161 MB |
| Requires iOS | 15.3 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [SimonsVoss Technologies GmbH](https://appshunter.io/developer/1141846652) | [Binary And Bricks Pvt Ltd](https://appshunter.io/developer/1587170688) |

## What reviewers say

### MobileKey

[App page](https://appshunter.io/ios/app/mobilekey/id1231074427)

Manage door statuses, grant remote access, and send digital keys to friends. Receive messages from event management and view access lists. Secure actions with Touch ID.

**Highlights:** Door status overview, Remote door openings, Send digital keys (Key4Friends), View access lists, Receive event management messages, Touch ID security

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

**In-app purchases:** none


### Construction Calculator A1

[App page](https://appshunter.io/ios/app/construction-calculator-a1/id1589484051)

This app provides specialized calculators for construction professionals, including concrete, rebar, and area/volume calculations. It offers material quantity estimation, unit conversion, and professional features like BOQ export and project organization. Designed for contractors, builders, and engineers on job sites worldwide.

**Highlights:** Concrete material quantity calculation, Rebar bending schedule and weight calculation, Feet-inch arithmetic without decimal conversion, Area and volume calculations for 15+ shapes, Construction-specific unit conversions, Bill of Quantities (BOQ) export to PDF/Excel, Save and organize calculations by project

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is MobileKey free?

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

### Is Construction Calculator A1 free?

Construction Calculator A1 is free to download, with no in-app purchases.

### Which has better reviews, MobileKey or Construction Calculator A1?

Construction Calculator A1 is rated higher. MobileKey averages 1.0 out of 5 from 1 ratings, while Construction Calculator A1 averages 4.7 from 29 ratings.

### Do MobileKey or Construction Calculator A1 have ads?

Construction Calculator A1 shows ads; MobileKey does not.

### Which is updated more often, MobileKey or Construction Calculator A1?

MobileKey ships an update every 3 months, and Construction Calculator A1 every 4 weeks. Most recently, MobileKey was updated on October 21, 2026 and Construction Calculator A1 on October 27, 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.*