Comparison

Fault Current Calculator vs TB Logic

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

TB Logic

This construction calculator offers essential tools for framers, concrete crews, and GCs. It provides feet-inch-fraction math and a tap-to-reuse running tape. A Pro version unlocks smart formulas, AI chat for jobsite math, and the ability to save and share work.

Highlights
  • Feet-inch-fraction math
  • Tap-to-reuse running tape
  • Smart construction formulas
  • AI jobsite math chat
  • Save and share work
  • Bilingual support (English/Spanish)
Features
Read full description

Tool Belt Logic is the jobsite calculator built for framers, concrete crews, and GCs - fast, simple, and made for dirty gloves. Free to use: - Construction calculator with feet-inch-fraction math - Tap-to-reuse running tape so you never lose a number Tool Belt Logic Pro unlocks: - Smart formulas: Rake Wall, Arch Wall, Stair Layout, Hip/Valley, Circle, Concrete Volume, and more - each with a clear cut list and a to-scale diagram - AI Chat that answers jobsite math in plain language - Learning Mode field tips - Save and share your work - English and Spanish No clutter, no fluff - just the numbers you need to build it right the first time.

Screenshots

Fault Current Calculator4 screens
TB Logic4 screens

Verdict

The call

The clearest difference is review sentiment: TB Logic at 100% against Fault Current Calculator's 0%. TB Logic also leads on rating (5.0 vs 3.0) and update cadence (weekly vs every 4 months). Fault Current Calculator's advantage is ratings volume (27 vs 4). On price, ads, in-app purchases and monetization model 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 and TB Logic sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

TB Logic holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: Fault Current Calculator has 27 ratings behind it against 4, 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 TB Logic's.

UpkeepUpdate frequency

Fault Current Calculator ships an update every 4 months, TB Logic weekly. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 6 level
Fault Current Calculator versus TB Logic: the parameters behind the verdict, then further details
ParameterFault Current CalculatorTB Logic
PriceFreeFree
Rating3.0 (27 ratings)5.0 (4 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings27 — better4
Update frequencyEvery 4 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.1
Further details — not scored
Size25 MB49 MB
Age rating17+4+
DeveloperCooper Bussmann, LLCChill Inc

Customer experience

Fault Current Calculator

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

TB Logic

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 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
2 purchases

TB Logic

Subscriptions2
  • Tool Belt Logic Pro3 Days trial$5.991 Month
  • Tool Belt Logic Pro (Yearly)3 Days trial$65.991 Year

Questions

Is Fault Current Calculator free?
Fault Current Calculator is free to download, with in-app purchases available.
Is TB Logic free?
TB Logic is free to download, with in-app purchases available.
Which has better reviews, Fault Current Calculator or TB Logic?
TB Logic is rated higher. Fault Current Calculator averages 3.0 out of 5 from 27 ratings, while TB Logic averages 5.0 from 4 ratings.
Do Fault Current Calculator or TB Logic have ads?
Neither Fault Current Calculator nor TB Logic shows ads.
Which is updated more often, Fault Current Calculator or TB Logic?
Fault Current Calculator ships an update every 4 months, and TB Logic weekly. Most recently, Fault Current Calculator was updated on November 1, 2026 and TB Logic on November 5, 2026.

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