Comparison

A3Calc vs Construction Calculator+

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

Head to head
About

A3Calc

Features
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A3 Small Format Interchangeable Core Calculator (sister app of A2Calc and A4Calc) ---Programmed by a Locksmith, for Locksmiths--- Automatically calculates the pinning chart for A3 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 16:9 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 when stored on your device. All projects can be exported via AirPrint and Email. 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

About

Construction Calculator+

Features
Read full description

Construction Calculator is your all-in-one solution for construction-related calculations and estimates. Key Features: • Area Calculations: Calculate square footage for floors, walls, and surfaces • Volume Measurements: Determine concrete, gravel, and other material volumes • Material Estimator: Calculate quantities for common building materials • Metric/Imperial Units: Easy conversion between measurement systems Perfect for: - Contractors - Architects - DIY Enthusiasts - Construction Managers - Home Renovators - Building Material Suppliers Simple, accurate, and user-friendly - your essential construction calculation companion.

Screenshots

A3Calc4 screens
Construction Calculator+4 screens

Verdict

The call

The clearest difference is ads: A3Calc at none against Construction Calculator+'s shown. On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

A3Calc costs $1.99 and Construction Calculator+ $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

A3Calc ships an update every 18 months, Construction Calculator+ every 10 months. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

Scorecard1 real difference · 5 level
A3Calc versus Construction Calculator+: the parameters behind the verdict, then further details
ParameterA3CalcConstruction Calculator+
Price$1.99$1.99
Update frequencyEvery 18 monthsEvery 10 months — better
AdsNo — betterYes
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better13.0
Further details — not scored
Size2 MB22 MB
Age rating4+4+
DeveloperFarren DomeniciJanoGroup LLC

In-app purchases

None

A3Calc

No in-app purchases

None

Construction Calculator+

No in-app purchases

Questions

Is A3Calc free?
A3Calc costs $1.99, with no in-app purchases.
Is Construction Calculator+ free?
Construction Calculator+ costs $1.99, with no in-app purchases.
Do A3Calc or Construction Calculator+ have ads?
Construction Calculator+ shows ads; A3Calc does not.
Which is updated more often, A3Calc or Construction Calculator+?
A3Calc ships an update every 18 months, and Construction Calculator+ every 10 months. Most recently, A3Calc was updated on September 30, 2026 and Construction Calculator+ on September 29, 2026.

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