# VOLT by ealloora vs Duct Construction

The clearest difference is price: VOLT by ealloora at Free against Duct Construction's $0.99. VOLT by ealloora also leads on update cadence (every 3 weeks vs every 10 months) and iOS requirement (10.0 vs 17.6). Duct Construction's advantage is chart position (#164 vs unranked). On ads, in-app purchases and device support there is nothing between them.

VOLT by ealloora is free to download; Duct Construction costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VOLT by ealloora ships an update every 3 weeks, Duct Construction every 10 months. The most recent releases landed on September 8, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | VOLT by ealloora | Duct Construction |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/duct-construction/id6443518338/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 10 months |
| Monetization | — | Paid |
| Best chart rank | — | **#164** |
| Size | 19 MB | 1 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sayme Wireless Sensor Network](https://appshunter.io/developer/1328360065) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### VOLT by ealloora

[App page](https://appshunter.io/ios/app/volt-by-ealloora/id1440278573)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duct Construction

[App page](https://appshunter.io/ios/app/duct-construction/id6443518338)

**Currently charting:** #164 Top Paid · Productivity (US App Store)

This app helps determine duct construction and reinforcement options based on duct size and system pressure class. It provides condensed lists of suitable options, saving time spent on manual calculations and table lookups. Results are based on industry standards for galvanized steel duct sheets.

**Highlights:** Duct size range from 2" to 120", Pressure classes up to 4 in.wg, Calculates duct weights per linear foot, Determines required duct gauge and reinforcement spacing, Clear illustrations for reinforcement types, Simple and effective UI design

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

**In-app purchases:** none


## Frequently asked questions

### Is VOLT by ealloora free?

VOLT by ealloora is free to download, with no in-app purchases.

### Is Duct Construction free?

Duct Construction costs $0.99, with no in-app purchases.

### Do VOLT by ealloora or Duct Construction have ads?

Neither VOLT by ealloora nor Duct Construction shows ads.

### Which is updated more often, VOLT by ealloora or Duct Construction?

VOLT by ealloora ships an update every 3 weeks, and Duct Construction every 10 months. Most recently, VOLT by ealloora was updated on September 8, 2026 and Duct Construction on September 25, 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.*