Comparison

Fault Current Calculator vs Panel Legend 2

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

Panel Legend 2

Easily create professional panel legends for any project size. This universal app supports multiple devices and offers features like iCloud sync, PDF export, and color-coded circuit numbers. It also includes helpful construction calculators.

Highlights
  • Create legends of any size
  • iCloud support for cross-device sync
  • Export legends as PDF
  • Color-coded circuit numbers
  • Construction style calculator included
  • Supports inches or centimeters
Features
Read full description

Panel Legend 2 is a fast, easy way to create panel legends for any size of job. Put your pencil down and start making professional legends today. - Universal app allows use on both iPad, Mac, and iPhone/iPod with single purchase. - iCloud support saves your data across multiple devices. - Create legends of any size with any number of circuits. - Print your legends right from the app. - Panel legends save based on job/project to easily locate them later. - Export your legends as pdf. - Include colour coded circuit numbers to easily keep track of phases. - Gang circuit description for multipole breakers. - Enter panel legend size in inches or centimeters. - Support for AB slim line panels. - App includes a full featured construction style calculator, torque calculator and conversion app.

Screenshots

Fault Current Calculator4 screens
Panel Legend 24 screens

Verdict

The call

The clearest difference is price: Fault Current Calculator at Free against Panel Legend 2's $6.99. Fault Current Calculator also leads on rating (3.0 vs 2.3) and ratings volume (27 vs 3). Panel Legend 2's advantage is in-app purchases (none vs 2) and review sentiment (14% vs 0%). On update cadence, 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

Fault Current Calculator is free to download; Panel Legend 2 costs $6.99 up front. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. Panel Legend 2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Fault Current Calculator holds the better App Store score, 3.0 against 2.3. That said, the two scores are not equally well evidenced: Fault Current Calculator has 27 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 0% of Fault Current Calculator's written reviews are positive against 14% of Panel Legend 2's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Fault Current Calculator ships an update every 4 months, Panel Legend 2 every 3 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
Fault Current Calculator versus Panel Legend 2: the parameters behind the verdict, then further details
ParameterFault Current CalculatorPanel Legend 2
PriceFree — better$6.99
Rating3.0 (27 ratings) — better2.3 (3 ratings)
Positive reviews0.0% of reviews14.3% of reviews — better
Number of ratings27 — better3
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better26.0
Further details — not scored
Size25 MB19 MB
Age rating17+4+
DeveloperCooper Bussmann, LLCSnappy Appz Inc.

Customer experience

Fault Current Calculator

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

Panel Legend 2

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews7 reviews
Positive14.3%
Neutral0.0%
Negative85.7%

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

Panel Legend 2

No in-app purchases

Questions

Is Fault Current Calculator free?
Fault Current Calculator is free to download, with in-app purchases available.
Is Panel Legend 2 free?
Panel Legend 2 costs $6.99, with no in-app purchases.
Which has better reviews, Fault Current Calculator or Panel Legend 2?
Fault Current Calculator is rated higher. Fault Current Calculator averages 3.0 out of 5 from 27 ratings, while Panel Legend 2 averages 2.3 from 3 ratings.
Do Fault Current Calculator or Panel Legend 2 have ads?
Neither Fault Current Calculator nor Panel Legend 2 shows ads.
Which is updated more often, Fault Current Calculator or Panel Legend 2?
Fault Current Calculator ships an update every 4 months, and Panel Legend 2 every 3 months. Most recently, Fault Current Calculator was updated on November 1, 2026 and Panel Legend 2 on November 3, 2026.

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