Fault Current Calculator vs Eyrus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Calculate available fault current
- Size fuses and conductors
- Generate service equipment labels
- Single and three-phase system support
- NEC® 110.24 compliance
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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
Eyrus
This app simplifies workforce management by providing automatic check-in/out, timesheet viewing, and profile updates for tradespeople. It allows easy project registration via QR code scanning and streamlines document review and submission.
- Automatic job site check-in/out
- View timesheets
- Update profile and certifications
- QR code project registration
- Digital document signing
- Workforce visibility
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The Eyrus app provides simple and automatic workforce management, visibility, and badging tools no matter the project or job size. Tradespeople can register themselves to a project, automatically check-in and out of the job site, view timesheets, and keep their profile and certification information up-to-date right in the app. Projects can be joined easily by scanning a QR code. Then complete the necessary registration information, review and sign documents, and submit for review. Once registration is approved, head to the job site to automatically track work hours. The Eyrus app handles check-in and check-out automatically based on project location.
Screenshots
Verdict
The clearest difference is rating: Eyrus at 5.0 against Fault Current Calculator's 3.1. Eyrus also leads on in-app purchases (none vs 2) and update cadence (monthly vs every 4 months). Fault Current Calculator's advantage is ratings volume (23 vs 1). 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
Both are free to download. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. Eyrus asks for nothing beyond the download.
Eyrus 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 1, so its average is the more settled of the two.
Fault Current Calculator ships an update every 4 months, Eyrus monthly. The most recent releases landed on September 14, 2026 and September 30, 2026 respectively.
| Parameter | Fault Current Calculator | Eyrus |
|---|---|---|
| Price | Free | Free |
| Rating | 3.1 (23 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 23 — better | 1 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 25 MB | 14 MB |
| Age rating | 17+ | 4+ |
| Developer | Cooper Bussmann, LLC | Eyrus |
Customer experience
Fault Current Calculator
Eyrus
In-app purchases
Fault Current Calculator
- Pro Monthly Subscription7 Days trial$4.991 Month
- Pro Annual Subscription7 Days trial$39.991 Year
Eyrus
No in-app purchases
Questions
Is Fault Current Calculator free?
Is Eyrus free?
Which has better reviews, Fault Current Calculator or Eyrus?
Do Fault Current Calculator or Eyrus have ads?
Which is updated more often, Fault Current Calculator or Eyrus?
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