Comparison

MobileKey vs Construction Calculator A1

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MobileKey

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
Read full description

MobileKey app to manage DM status, access lists, remote openings, Key4Friends and reception of messages from event management. - Overview of door statuses (if DM cylinder used) - Remote openings - Sending of Key4Friends authorisations - Reading and display of access list - Reception of push messages from event management. - Use of touch ID for security-related actions (disable remote opening, Key4Friends, push messages) The locking plan is fully managed on the MobileKey web application only, which you will find at www.my-mobilekey-com. Extra information: - The app requires valid log-in data for a MobileKey locking system. You need to have a MobileKey account to be able to use the account. You can register free of charge at www.my-mobilekey-com. - Your mobile device needs to have a stable Internet connection to operate the app, such as wireless LAN or 3/4G. - Many functions are only available with the online add-on (SmartBridge). Security takes top priority: Your data is stored on an audited SimonsVoss server in Munich. You do not need to worry about data security and backups. We will do it for you and to a high standard. Instructions: - Create a free MobileKey account for your use. - Obtain all MobileKey components, such as keys and locks. - Set up the MobileKey components in the web application. You will find the precise procedure in the MobileKey manual. - Programme the components. - Test the components. - Fit the components. You will find more help in the enclosed manuals.

About

Construction Calculator A1

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
Read full description

The #1 construction calculator trusted by 1M+ contractors, builders, and engineers worldwide. Construction Calculator A1 — the complete civil engineering toolkit for contractors, builders and engineers. 500+ calculators, from a single slab to a client-ready Bill of Quantities. CONCRETE CALCULATOR • Slabs, footings, columns, beams, stairs, walls & culverts • Instant material quantities: cement bags, sand, aggregate • Mix ratios and grade selection for any specification REBAR & STEEL CALCULATOR • Bar Bending Schedule (BBS) with shape codes and cutting lengths • Weight calculator for metric and US bar sizes (#3–#11) • Lap length, cover & spacing calculations • Steel tonnage for structural estimates FEET-INCHES CALCULATOR • Add, subtract, multiply, divide in feet-inches-fractions • No decimal conversion needed • Running tape you can review and reuse BILL OF QUANTITIES (BOQ) — NEW • Send any calculation straight to a BOQ • Organise by project, track total value and % priced • Professional report with your company header and signature • Export as PDF or Excel AUTOMATIC DRAWINGS — NEW • Calculators draw a dimensioned sketch of what you entered • Brickwork, steel shapes, concrete sections, excavation, stairs • Drawings and a DIMENSIONS panel included in every PDF MATERIAL PRICE LIBRARY — NEW • Store your own rates in your own currency • Rates auto-fill into cost fields across the app • Six regional presets with local materials and units APPLE WATCH APP — NEW • Converter, material weight, volume, diagonal and rebar on your wrist • Prices synced from iPhone, with full calculation history AREA & VOLUME • 50+ shapes: rectangle, circle, triangle, trapezoid, polygons, prisms, cones, spheres and more • Draw Shape and GPS Area for irregular plots • Room area, paint coverage, flooring and excavation volumes UNIT CONVERTER • Length, area, volume, weight, pressure, power, speed, density and more • Construction-specific units throughout LEARN — NEW • Civil engineering articles, checklists and reference charts • Topic quizzes with instant explanations • Daily streaks, XP and achievement badges PROFESSIONAL FEATURES • Save and organise calculations by project, with notes and photos • Share estimates with clients instantly • Construction cost estimator with breakdown charts and quotations • Company branding on every report • Google Drive and iCloud backup, cloud sync across devices • Metric and Imperial, 16 languages, light and dark themes • Works offline — calculations need no internet SUBSCRIPTION INFORMATION Construction Calculator Pro is available as a monthly or yearly auto-renewing subscription, or as a one-time Lifetime purchase. • Payment is charged to your Apple ID account at confirmation of purchase. • Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. • Your account is charged for renewal within 24 hours prior to the end of the current period, at the rate of your selected plan. • Manage or cancel your subscription in your App Store account settings after purchase. Privacy Policy: https://www.binaryandbricks.com/app/privacypolicy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Built for real job sites. Download now and estimate like a pro.

Screenshots

MobileKey4 screens
Construction Calculator A14 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
MobileKey versus Construction Calculator A1: the parameters behind the verdict, then further details
ParameterMobileKeyConstruction Calculator A1
PriceFreeFree
Rating1.0 (1 ratings)4.7 (29 ratings) — better
Positive reviews32.3% of reviews66.7% of reviews — better
Number of ratings129 — better
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.315.0 — better
Further details — not scored
Size49 MB161 MB
Age rating4+4+
DeveloperSimonsVoss Technologies GmbHBinary And Bricks Pvt Ltd

Customer experience

MobileKey

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews31 reviews
Positive32.3%
Neutral16.1%
Negative51.6%

Construction Calculator A1

All ratings26 ratings
Positive96.2%
Neutral0.0%
Negative3.8%
Written reviews12 reviews
Positive66.7%
Neutral8.3%
Negative25.0%

In-app purchases

None

MobileKey

No in-app purchases

None

Construction Calculator A1

No in-app purchases

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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