# Fault Current Calculator vs TB Logic

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.

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.

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.

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.

## The numbers

| Metric | Fault Current Calculator | TB Logic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (27 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/tb-logic/id6783934469/reviews)** |
| Number of ratings | **27** | 4 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Freemium | Freemium |
| Size | 25 MB | 49 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Chill Inc](https://appshunter.io/developer/6783934471) |

## What reviewers say

### Fault Current Calculator

[App page](https://appshunter.io/ios/app/fault-current-calculator/id647477910)

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:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $4.99 | per month |
| Pro Annual Subscription | $39.99 | per year |


### TB Logic

[App page](https://appshunter.io/ios/app/tb-logic/id6783934469)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tool Belt Logic Pro | $5.99 | per month |
| Tool Belt Logic Pro (Yearly) | $65.99 | per year |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*