Comparison

Fault Current Calculator vs QR Xpert

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

Head to head
About

Fault Current Calculator

This tool helps contractors, engineers, and electricians quickly calculate available fault current on single and three-phase electrical systems. It also assists in sizing fuses and conductors for various circuits and can generate labels for service equipment.

Highlights
  • Calculate available fault current
  • Size fuses and conductors
  • Generate service equipment labels
  • Single and three-phase system support
  • NEC® 110.24 compliance
Features
Read full description

Eaton's Bussmann Series FC2 Available Fault Current Calculator application is an innovative tool developed for contractors, engineers, electricians, and electrical inspectors. This tool can be used on the Bussmann website or out in the field on a mobile device for those needing a quick and simple way to determine available fault current. With this simple tool, users can: - Calculate available fault current on single and three-phase systems - Create and send a label via email for marking the available fault current on service equipment (NEC® 110.24) - Size fuses and conductors for service, feeder, and branch circuits. This application, calculations, and other information are intended to clearly present technical information that will determine the available fault current at specific points in an electrical system. Bussmann reserves the right, without notice, to change this application and/or discontinue/ limit its distribution and/or availability. Bussmann also reserves the right to change or update, without notice, any technical information contained in this application. The data and information presented in this application are believed to be accurate. However, any and all liability for the content, or any omissions from this application, including any inaccuracies, errors, or misstatements in such data, calculations or information, is expressly disclaimed. The application, calculations and other information are provided without warranty of any kind, either expressed or implied, but not limited to, the implied warranties of merchantability, or fitness for a particular purpose. Bussmann disclaims any liability for the use of this application, calculations or other information. The complete End-User License Agreement can be found at: https://faultcurrentcalculatorpro.bussmann.com/home/eula

About

QR Xpert

This app helps construction professionals understand and verify seismic bracing installations. It provides project-specific requirements and quality assurance status by scanning QR codes on bracing kits and tags.

Highlights
  • Project-specific seismic installation requirements
  • Quality assurance approval status
  • QR code scanning for bracing kits
  • Real-time QA reports
  • Streamlined construction process
  • Enhanced field transparency
Features
Read full description

Become an Expert in the installation and quality assurance of non-structural seismic bracing by using this app to easily understand location specific seismic bracing requirements. QRXpert delivers specific installation information and hands on understanding to the very individuals that need it most, the installer and quality assurance personnel. This app was created specifically to be used in conjunction with ISAT’s project specific engineered seismic bracing kits and QC tag system. Each seismic location has its own unique QR code within the submittal, labelled on each kit and comes with a Quality Assurance QR tag to be installed after installation. This common QR code used throughout the process allows for any and all stakeholders to know exactly what should be installed at every unique location on a project. Additionally, the QR tag allows for the oversight team to completely understand what should be installed at that location and a simple way to track the QC process. Upon scanning the QR code, field members have unlimited access to kit installation details, project specific requirements, and updated quality assurance approval status on one accessible platform. Construction requirements can be confusing, but with QRXpert you can streamline the process by eliminating surprises in the field. Quickly resolve installation concerns or avoid them altogether, saving both time and money. Key Features: Easily view and share project specific seismic installation requirements. At a glance, project specific seismic requirements so everyone knows what must be braced. Provides additional transparency at the field level. Empowers team members with an upgraded means to ensure seismic compliance is achieved at the project site. Get updated quality assurance reports in real-time.

Screenshots

Fault Current Calculator4 screens
QR Xpert4 screens

Verdict

The call

The clearest difference is rating: QR Xpert at 4.2 against Fault Current Calculator's 3.0. QR Xpert also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 4 months). Fault Current Calculator's advantage is ratings volume (27 vs 6). On price, ads 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

Both are free to download. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. QR Xpert asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

QR Xpert holds the better App Store score, 4.2 against 3.0. Both are backed by a comparable volume of ratings — 27 and 6 respectively.

UpkeepUpdate frequency

Fault Current Calculator ships an update every 4 months, QR Xpert every 3 weeks. The most recent releases landed on October 23, 2026 and October 29, 2026 respectively.

Scorecard6 real differences · 4 level
Fault Current Calculator versus QR Xpert: the parameters behind the verdict, then further details
ParameterFault Current CalculatorQR Xpert
PriceFreeFree
Rating3.0 (27 ratings)4.2 (6 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings27 — better6
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.09.0 — better
Further details — not scored
Size25 MB28 MB
Age rating17+4+
DeveloperCooper Bussmann, LLCTomarco Contractor Specialties, Inc

Customer experience

Fault Current Calculator

All ratings23 ratings
Positive47.8%
Neutral8.7%
Negative43.5%
Written reviews10 reviews
Positive0.0%
Neutral20.0%
Negative80.0%

QR Xpert

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

2 purchases

Fault Current Calculator

Subscriptions2
  • Pro Monthly Subscription7 Days trial$4.991 Month
  • Pro Annual Subscription7 Days trial$39.991 Year
None

QR Xpert

No in-app purchases

Questions

Is Fault Current Calculator free?
Fault Current Calculator is free to download, with in-app purchases available.
Is QR Xpert free?
QR Xpert is free to download, with no in-app purchases.
Which has better reviews, Fault Current Calculator or QR Xpert?
QR Xpert is rated higher. Fault Current Calculator averages 3.0 out of 5 from 27 ratings, while QR Xpert averages 4.2 from 6 ratings.
Do Fault Current Calculator or QR Xpert have ads?
Neither Fault Current Calculator nor QR Xpert shows ads.
Which is updated more often, Fault Current Calculator or QR Xpert?
Fault Current Calculator ships an update every 4 months, and QR Xpert every 3 weeks. Most recently, Fault Current Calculator was updated on October 23, 2026 and QR Xpert on October 29, 2026.

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