# Voltage Drop Calculator. vs TB Logic

The clearest difference is review sentiment: TB Logic at 100% against Voltage Drop Calculator.'s 33%. TB Logic also leads on ads (none vs shown) and update cadence (weekly vs every 3 months). Voltage Drop Calculator.'s advantage is ratings volume (414 vs 4). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Voltage Drop Calculator. sells 1 one-off in-app purchase 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 4.6. That said, the two scores are not equally well evidenced: Voltage Drop Calculator. has 414 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 33% of Voltage Drop Calculator.'s written reviews are positive against 100% of TB Logic's.

Voltage Drop Calculator. ships an update every 3 months, TB Logic weekly. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Voltage Drop Calculator. | TB Logic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (414 ratings)](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/tb-logic/id6783934469/reviews)** |
| Number of ratings | **414** | 4 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 51 MB | 49 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Chill Inc](https://appshunter.io/developer/6783934471) |

## What reviewers say

### Voltage Drop Calculator.

[App page](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064)

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

**Highlights:** NEC and IEC dual standards, Voltage drop and wire sizing calculations, Support for continuous load and corrections, Copper or Aluminum conductor options, Single-phase and three-phase systems, Automatic compliance checks, PDF report generation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $4.99 | one-time |


### 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 Voltage Drop Calculator. free?

Voltage Drop 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, Voltage Drop Calculator. or TB Logic?

TB Logic is rated higher. Voltage Drop Calculator. averages 4.6 out of 5 from 414 ratings, while TB Logic averages 5.0 from 4 ratings.

### Do Voltage Drop Calculator. or TB Logic have ads?

Voltage Drop Calculator. shows ads; TB Logic does not.

### Which is updated more often, Voltage Drop Calculator. or TB Logic?

Voltage Drop Calculator. ships an update every 3 months, and TB Logic weekly. Most recently, Voltage Drop Calculator. was updated on October 29, 2026 and TB Logic on October 10, 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.*