# Kopperfield vs VoltForge

The clearest difference is rating: VoltForge at 5.0 against Kopperfield's 3.9. Kopperfield's advantage is in-app purchases (none vs 1) and ratings volume (9 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. VoltForge sells 1 one-off in-app purchase. Kopperfield asks for nothing beyond the download.

VoltForge holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Kopperfield has 9 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Kopperfield | VoltForge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (9 ratings)](https://appshunter.io/ios/app/kopperfield/id6736772332/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/voltforge/id6762475628/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 45 MB | 47 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kopperfield](https://appshunter.io/developer/1756157251) | [Clark Allen](https://appshunter.io/developer/1888902287) |

## What reviewers say

### 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


### VoltForge

[App page](https://appshunter.io/ios/app/voltforge/id6762475628)

This app provides electricians with essential field calculators, up-to-date code references, and a job estimator. It offers tools for Ohm's Law, voltage drop, conduit bending, and wire ampacity, all accessible offline. Pro features are available as a one-time purchase.

**Highlights:** Ohm's Law & Voltage Drop Calculator, Fraction & Wire Ampacity Tables, Conduit Bending & Fill Calculators, Wire Pull Tension Calculator, NEC 2023 Quick Reference, Job Estimator with PDF Export

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Kopperfield free?

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

### Is VoltForge free?

VoltForge is free to download, with in-app purchases available.

### Which has better reviews, Kopperfield or VoltForge?

VoltForge is rated higher. Kopperfield averages 3.9 out of 5 from 9 ratings, while VoltForge averages 5.0 from 1 ratings.

### Do Kopperfield or VoltForge have ads?

Neither Kopperfield nor VoltForge shows ads.

### Which is updated more often, Kopperfield or VoltForge?

Kopperfield ships an update every 3 weeks, and VoltForge every 3 weeks. Most recently, Kopperfield was updated on October 3, 2026 and VoltForge on October 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.*