# Power Conversion Calc vs Kopperfield

The clearest difference is update cadence: Kopperfield at every 3 weeks against Power Conversion Calc's every 3 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.

Power Conversion Calc ships an update every 3 months, Kopperfield every 3 weeks. The most recent releases landed on September 12, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | Power Conversion Calc | 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 3 months | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 6 MB | 45 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **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

### Power Conversion Calc

[App page](https://appshunter.io/ios/app/power-conversion-calc/id6483929959)

**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 Power Conversion Calc free?

Power Conversion Calc is free to download, with no in-app purchases.

### Is Kopperfield free?

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

### Do Power Conversion Calc or Kopperfield have ads?

Neither Power Conversion Calc nor Kopperfield shows ads.

### Which is updated more often, Power Conversion Calc or Kopperfield?

Power Conversion Calc ships an update every 3 months, and Kopperfield every 3 weeks. Most recently, Power Conversion Calc was updated on September 12, 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.*