# BuilderFax By Lumber vs CircuitSense

The clearest difference is in-app purchases: BuilderFax By Lumber at none against CircuitSense's 2. BuilderFax By Lumber also leads on ratings volume (7 vs 2). CircuitSense's advantage is update cadence (every 3 days vs every 9 days) and iOS requirement (13.0 vs 15.1). On price, rating, ads and device support there is nothing between them.

Both are free to download. CircuitSense sells 2 in-app purchases, starting at $9.99 per month. BuilderFax By Lumber asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for BuilderFax By Lumber against 5.0 for CircuitSense. Both are backed by a comparable volume of ratings — 7 and 2 respectively.

BuilderFax By Lumber ships an update every 9 days, CircuitSense every 3 days. Both last shipped on October 28, 2026.

## The numbers

| Metric | BuilderFax By Lumber | CircuitSense |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/builderfax-by-lumber/id6754037484/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/circuitsense/id6755273867/reviews) |
| Number of ratings | **7** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 63 MB | 37 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lumberfi Inc](https://appshunter.io/developer/1714403069) | [CircuitSense LLC](https://appshunter.io/developer/1850351250) |

## What reviewers say

### BuilderFax By Lumber

[App page](https://appshunter.io/ios/app/builderfax-by-lumber/id6754037484)

Securely store, manage, and share your professional certifications and licenses. Upload documents, categorize them for easy access, and instantly share verified credentials via QR code or SMS link for on-site proof.

**Highlights:** Add and manage certifications, Categorize professional documents, Share verified credentials instantly, QR code and SMS link sharing, Secure verification page

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

**In-app purchases:** none


### CircuitSense

[App page](https://appshunter.io/ios/app/circuitsense/id6755273867)

This app automates complex electrical calculations for electricians, including conduit sizing, conductor ampacity, and voltage drop, based on the 2026 NEC. It provides detailed explanations for each result and organizes calculations by project for easy access and professional output sharing.

**Highlights:** Automated conduit and conductor sizing, Voltage drop and derating calculations, Box fill and pull box sizing, Load calculations for various building types, Fault current and transformer sizing, Conduit bending and panel phasing tools, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CircuitSense Pro | $9.99 | per month |
| CircuitSense Pro | $79.99 | per year |


## Frequently asked questions

### Is BuilderFax By Lumber free?

BuilderFax By Lumber is free to download, with no in-app purchases.

### Is CircuitSense free?

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

### Which has better reviews, BuilderFax By Lumber or CircuitSense?

BuilderFax By Lumber and CircuitSense are both rated 5.0 out of 5 on the App Store, from 7 and 2 ratings respectively.

### Do BuilderFax By Lumber or CircuitSense have ads?

Neither BuilderFax By Lumber nor CircuitSense shows ads.

### Which is updated more often, BuilderFax By Lumber or CircuitSense?

BuilderFax By Lumber ships an update every 9 days, and CircuitSense every 3 days. Most recently, BuilderFax By Lumber was updated on October 28, 2026 and CircuitSense on October 28, 2026.

---

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