# Concentric Neutral Calculator vs Kopperfield

The clearest difference is update cadence: Kopperfield at every 3 weeks against Concentric Neutral Calculator's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Concentric Neutral Calculator ships an update every 7 months, Kopperfield every 3 weeks. The most recent releases landed on September 19, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | Concentric Neutral Calculator | Kopperfield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.9 (9 ratings)](https://appshunter.io/ios/app/kopperfield/id6736772332/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 5 MB | 45 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Kopperfield, Inc.](https://appshunter.io/developer/1756157251) |

## What reviewers say

### Concentric Neutral Calculator

[App page](https://appshunter.io/ios/app/concentric-neutral-calculator/id6478878772)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kopperfield

[App page](https://appshunter.io/ios/app/kopperfield/id6736772332)

Streamline electrical design and permitting with powerful tools for load calculations, panel schedules, and single-line diagrams. Quickly reference the National Electrical Code with an AI-powered chatbot and generate instant PDF reports for inspectors and clients.

**Highlights:** Load calculator with NEC standards, Single line diagram tool, Panel schedule creation, NEC chatbot, Instant PDF report generation, AI panel photo processing, Team dashboard

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

**In-app purchases:** none


## Frequently asked questions

### Is Concentric Neutral Calculator free?

Concentric Neutral Calculator is free to download, with no in-app purchases.

### Is Kopperfield free?

Kopperfield is free to download, with no in-app purchases.

### Do Concentric Neutral Calculator or Kopperfield have ads?

Neither Concentric Neutral Calculator nor Kopperfield shows ads.

### Which is updated more often, Concentric Neutral Calculator or Kopperfield?

Concentric Neutral Calculator ships an update every 7 months, and Kopperfield every 3 weeks. Most recently, Concentric Neutral Calculator was updated on September 19, 2026 and Kopperfield on August 21, 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.*