Comparison

Fault Current Calculator vs FireAlarmGuy

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

FireAlarmGuy

This utility app provides two essential tools for fire alarm technicians. It features a calculator for determining DMX dip switch settings and a decoder for understanding battery manufacturing date codes, streamlining fieldwork.

Highlights
  • DMX Dip Switch Calculator
  • Battery Date Code Decoder
  • Device addressing assistance
  • Battery production date lookup
  • Fieldwork simplification
Read full description

FireAlarmGuy is the ultimate tool for fire alarm technicians, combining two essential features in one app: DMX Dip Switch Calculator – Instantly find the correct dip switch positions for device addressing. Just enter the address, and get the right settings in seconds. Battery Date Code Decoder – Quickly decode manufacturing date codes for sealed lead-acid (SLA) batteries. Enter the code to determine the production date. Built by a fire alarm tech, for fire alarm techs, FireAlarmGuy makes fieldwork faster and easier. Download now and simplify your job!

Screenshots

Fault Current Calculator4 screens
FireAlarmGuy3 screens

Verdict

The call

The clearest difference is review sentiment: FireAlarmGuy at 100% against Fault Current Calculator's 0%. FireAlarmGuy also leads on rating (5.0 vs 3.1) and in-app purchases (none vs 2). Fault Current Calculator's advantage is ratings volume (23 vs 2). On price, ads, 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. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. FireAlarmGuy asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FireAlarmGuy holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Fault Current Calculator has 23 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Fault Current Calculator's written reviews are positive against 100% of FireAlarmGuy's.

UpkeepUpdate frequency

Fault Current Calculator ships an update every 4 months, FireAlarmGuy every 2 weeks. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

Scorecard6 real differences · 4 level
Fault Current Calculator versus FireAlarmGuy: the parameters behind the verdict, then further details
ParameterFault Current CalculatorFireAlarmGuy
PriceFreeFree
Rating3.1 (23 ratings)5.0 (2 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings23 — better2
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.1
Further details — not scored
Size25 MB15 MB
Age rating17+4+
DeveloperCooper Bussmann, LLCJack Dalton

Customer experience

Fault Current Calculator

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

FireAlarmGuy

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

FireAlarmGuy

No in-app purchases

Questions

Is Fault Current Calculator free?
Fault Current Calculator is free to download, with in-app purchases available.
Is FireAlarmGuy free?
FireAlarmGuy is free to download, with no in-app purchases.
Which has better reviews, Fault Current Calculator or FireAlarmGuy?
FireAlarmGuy is rated higher. Fault Current Calculator averages 3.1 out of 5 from 23 ratings, while FireAlarmGuy averages 5.0 from 2 ratings.
Do Fault Current Calculator or FireAlarmGuy have ads?
Neither Fault Current Calculator nor FireAlarmGuy shows ads.
Which is updated more often, Fault Current Calculator or FireAlarmGuy?
Fault Current Calculator ships an update every 4 months, and FireAlarmGuy every 2 weeks. Most recently, Fault Current Calculator was updated on October 2, 2026 and FireAlarmGuy on October 11, 2026.

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